Yes, you can put a smart thermostat on a heat pump, and it is one of the best upgrades you can make to the system. The catch is that the thermostat has to speak heat pump, meaning it must be able to call the compressor first, hold off on the expensive backup electric heat, and handle more than two stages if your outdoor unit has them. A thermostat built only for a gas furnace will burn through auxiliary heat far more often than it needs to, and that is where the bills go wrong.
That is the whole problem this guide solves. Across the ten units below, the difference between a mediocre choice and a good one is not the touchscreen or the voice assistant. It is stage control, lockout settings, and whether the thermostat lets you stop the compressor from handing off to strip heat too early. We went through the wiring requirements, staging depth, app settings and owner feedback on each one so you can match a unit to the system you actually own.
If you have not settled on the heat pump itself yet, start with our heat pump reviews, because the thermostat has to match the equipment. If you already know your equipment and just want the shortlist, the table below is the fastest read. For broader Wi-Fi thermostat comparisons beyond heat pumps, our Wi-Fi thermostat roundup covers the general market.
Top 3 Picks: Best Smart Thermostats for Heat Pumps (October 2026)
Three units earned the right to lead this list. The Sensi ST55 wins overall because it is the rare combination of a 23,000-review install base, no C-wire requirement in most applications, and confirmed operation on heat pumps, boilers and furnaces. The Sensi Touch ST75 takes the value slot for anyone who wants a readable color screen. The ecobee Smart Thermostat Premium earns the premium slot for the deepest heat pump settings in this group.
Sensi Smart Thermostat ST55
- Works with heat pumps
- boilers and furnaces
- No C wire required in most applications
- ENERGY STAR certified
- Wide app and voice assistant support
Sensi Touch Smart Thermosta…
- Touchscreen color display
- Works with heat pumps and two-stage heating
- C wire required
- Alexa
- HomeKit and SmartThings support
ecobee Smart Thermostat…
- Included SmartSensor for room balancing
- Built-in air quality monitor
- Radar occupancy sensing
- Power Extender Kit included
All 10 Smart Thermostats for Heat Pumps Compared in 2026
Every unit below is confirmed by its manufacturer to run a heat pump. The features column lists what actually separates them, because on this category the spec sheet matters less than staging depth and wiring requirements.
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1. Sensi Smart Thermostat ST55 – Best Overall for Heat Pumps
Sensi Smart Thermostat, Wi-Fi, DIY, Alexa, Energy Star Certified, ST55
Wi-Fi
Heat pump boiler and furnace ready
No C wire in most applications
ENERGY STAR certified
The Good
- Installs on most heat pumps
- boilers and furnaces without a C wire
- Built-in level on the back plate for straight mounting
- Scheduling app is among the easiest to configure
- Two AA batteries give long battery life
The Bad
- High and low temperature alert thresholds are fixed and not adjustable
- Wi-Fi registration can fail on routers that combine 2.4 GHz and 5 GHz bands
- Physical buttons feel dated against touchscreen models
The ST55 is the unit we kept coming back to while testing this category. It carries the largest review base in the group at more than 23,000 ratings, and the pattern in those reviews is remarkably consistent: owners install it without drama and then stop thinking about it. That is the highest compliment you can pay a thermostat.
What matters most for a heat pump is on the spec sheet. Copeland lists air conditioner, boiler, furnace and heat pump among the specific uses, and the manufacturer is explicit that a C wire is not required in most applications. That single detail removes the biggest obstacle for people retrofitting an older house, where running a new control wire means opening walls.
The app is where this thermostat separates itself. Multi-schedule configuration is straightforward, including copying and swapping day groups, which sounds minor until you are trying to set up a heat pump schedule that differs between heating and cooling seasons. Usage reports, equipment alerts and filter replacement reminders run through the same interface, so you are not hunting through three apps to find out why the system ran overnight.
Ecobee and Nest users get more automation features. What the ST55 gives up in return is fewer moving parts, which is exactly why it is our pick for a heat pump that also serves a boiler or a furnace. Voice control runs through Alexa, Apple HomeKit, Google Assistant, SmartThings and Vera, so ecosystem lock-in is not a real risk here.
What to check before you buy the ST55
Confirm your system is 24 VAC and within the listed uses. Measure the wall opening if you care about fit, since the unit measures 1 inch deep by 5.88 inches wide by 3.75 inches tall and uses the same footprint as a traditional thermostat.
If you need adjustable temperature alerts for an unattended property, this is the wrong unit. Fixed thresholds mean a failed heat pump in a rental or cabin produces no notification.
Who should skip the ST55
Skip it if you want a color touchscreen, room-by-room sensing, or granular lockout thresholds you can tune from the app. It also runs on 2.4 GHz only, so a mesh network with a single smart-mode SSID can complicate pairing.
Skip it if you plan to rely on remote sensors for a large house. The ST55 has no sensor ports, so multi-room control means buying a different product entirely.
2. Sensi Touch Smart Thermostat ST75 – Best Value With a Color Screen
Sensi Touch Smart Thermostat by Emerson with Touchscreen Color Display, Programmable, Wi-Fi, Mobile App, Easy DIY, Data Privacy, Works with Alexa, Energy Star Certified, ST75 – Black, C-Wire Required
4.3 inch color touchscreen
Heat pumps, boilers and furnaces
C wire required
ENERGY STAR certified
The Good
- Large color touchscreen readable from across the room
- Color-coded display shows heating or cooling at a glance
- HVAC professionals rate build quality and reliability highly
- Supports two-stage heating on heat pump systems
The Bad
- C wire required and there is no battery backup compartment
- Wi-Fi setup can struggle on single smart-mode or guest networks
- Operates on the 2.4 GHz band only
- Registration limited to the US and Canada
The ST75 holds the highest average rating in this group at 4.5 across more than 14,000 ratings, and installers consistently single it out. When HVAC professionals rate a thermostat highly, that is usually a comment about terminal design and how forgiving the wiring is, which matters more than any screen size.
For a heat pump, the important line is that it works with heat pumps, boilers and conventional systems including two-stage heating. Two-stage support is where the value shows up, because stage 2 on a heat pump is usually the first sign of backup heat, and controlling that staging properly is the entire game.
The display background changes color to signal heating or cooling, in red or orange and blue. It sounds cosmetic, but on a heat pump it answers the question owners actually ask, which is whether the compressor or the backup element is running right now.
Installers like the illuminated easy-click terminals and the built-in level, and Alexa integration is noted as easier than competing brands. Privacy is handled better than most: the manufacturer states plainly that Sensi will not sell personal information to third parties.
What to check before you buy the ST75
Verify you have a C wire before you order. This unit requires one, and the spec listing mentions AA batteries, but the sealed body has no compartment, so a power cut means no control until power returns.
If you live outside the US and Canada, registration and full app functionality will not work as advertised. Check your region before buying.
Who should skip the ST75
Skip it if your panel has no C wire and you do not want to run a new one. The ST55 covers that case in the same product line with a different model.
Skip it if you need humidity control, dehumidifier control, or more than two heating stages. Those requirements point to the Honeywell Vision Pro 8000 instead.
3. ecobee Smart Thermostat Premium – Best for Deep Heat Pump Control
ecobee Smart Thermostat Premium – WiFi, Siri & Alexa Built-In, Smart Sensor
Works with 95% of HVAC systems
Included SmartSensor
Built-in air quality monitor
Power Extender Kit included
The Good
- Included SmartSensor resolves hot and cold rooms by prioritizing rooms in use
- Radar occupancy sensing preheats and precools
- Works with heat pumps
- boilers
- furnaces
- humidifiers and dehumidifiers
- Power Extender Kit included for homes without a C wire
The Bad
- Highest price in this group and Siri needs an Apple home hub or a paid subscription
- Front door video requires a separate ecobee Smart Doorbell Camera
- Additional SmartSensors are sold separately
When heat pump owners on r/homeowners are asked for a single recommendation, the answer that comes back most often is the ecobee Smart Thermostat Premium. That reputation is not accidental. It is the thermostat other HVAC people tell you to install when staging behavior is the problem.
The reason lives in the settings. Both lockout values sit under Settings, then Installation Settings, then Thresholds, where you can set an auxiliary heat lockout temperature and adjust stage 2 behavior directly. On r/ecobee, owners describe lowering the lockout so auxiliary heat only engages when the compressor genuinely cannot keep up. That is precisely the setting that separates a cheap heating month from an expensive one.
Compatibility is the other strength. ecobee states the Premium works with 95% of HVAC systems, verified through an online compatibility checker, and the listed uses include air conditioner, boiler, dehumidifier, electric baseboard heater, furnace, heat pump and humidifier. Humidifier and dehumidifier control matters on a heat pump because the dehumidification circuit is tied to the same staging logic.
The box includes the SmartSensor, backplate, wire labels, screws, power extender kit, trim plate and a three-year warranty. Owners on r/geothermal report switching to ecobee specifically because they had been fighting another brand over aux heat and wanted finer staging control.
What to check before you buy the Premium
Run the online compatibility checker before you order. If your system falls outside the supported 95%, you want to know that before the box arrives, not after.
Count the rooms that actually need temperature attention. One SmartSensor is included, and every additional sensor is a separate purchase, so a large two-story house changes the math quickly.
Who should skip the Premium
Skip it if the front door camera and two-way talk features matter to you, since those need separate ecobee hardware. Skip it if you want Siri without paying for an Apple home hub or a subscription.
Skip it if budget is the deciding factor. The Enhanced model in this same line covers most heat pump installs at a lower tier, and the Essential handles the basics.
4. ecobee Smart Thermostat Enhanced – Best for Occupancy-Based Control
ecobee Smart Thermostat Enhanced, Programmable Wifi Thermostat
Built-in occupancy sensing
eco+ energy optimization
Power Extender Kit included
24 VAC systems
The Good
- Occupancy sensing preheats and precools ahead of arrival
- Works with heat pumps
- boilers
- furnaces and humidifiers
- Power Extender Kit included so no C wire is needed in many older homes
- Clean design with a large display and Apple Watch control
The Bad
- SmartSensors for room-by-room control are sold separately
- Priced above budget models while lacking the Premium speaker and air quality sensor
The Enhanced is the middle of the ecobee line and, for many heat pump owners, the most sensible one. It keeps the two features that affect comfort on a heat pump, which are occupancy sensing and eco+ scheduling, and it drops the smart speaker and air quality monitor.
Occupancy sensing is more useful on a heat pump than on a gas furnace because the compressor takes time to ramp. If the system knows you are twenty minutes out, it can start early and finish the recovery without overshooting into stage 2. eco+ uses routine, comfort preferences, local weather and grid activity to shape the schedule around that.
Compatibility is listed at 90% of HVAC systems, and heat pumps are named among the compatible types alongside boilers, furnaces and humidifiers. The Power Extender Kit and trim kit are included in the box, which removes the most common install surprise.
The app runs on smartphone, tablet or Apple Watch, and it works with Alexa, Google Assistant, Apple HomeKit and SmartThings. That is broad enough that ecosystem choice does not drive this decision.
What to check before you buy the Enhanced
Compare the 90% compatibility figure against your system before you commit. If your equipment is older or unusual, the Premium or Essential checkers may give you a different answer.
Decide how many rooms you want on sensors. The Enhanced accepts added SmartSensors, but none ship in the box, so budget for them if your upstairs runs warm.
Who should skip the Enhanced
Skip it if you want the included SmartSensor, since that only comes with the Premium. Skip it if you want a built-in air quality monitor or a voice speaker on the unit itself.
Skip it if you need humidifier or dehumidifier control beyond basic scheduling, or if you want the deepest staging controls on a complex heat pump.
5. Honeywell Lyric T6 Pro – Best for Two-Stage Heat Pumps
Honeywell TH6220WF2006/U Lyric T6 Pro Wi-Fi Programmable Thermostat with Stages Up to 2 Heat/1 Cool Heat Pump or 2 Heat/2 Cool Conventional
Up to 2 heat / 1 cool staging on heat pumps
2 heat / 2 cool conventional
Wi-Fi remote access
2 AA batteries
The Good
- Purpose-built staging support for two-stage heat pump systems
- Compact and light at 4 ounces and 5 by 2.3 by 6 inches
- Wi-Fi access without the cost of a premium touchscreen
The Bad
- Simple monochrome display with fewer on-screen features
- C wire required for Wi-Fi functionality on many installations
The Lyric T6 Pro is one of the few thermostats in this group built around heat pump staging from the start. It supports up to two heat and one cool stage on heat pumps, and up to two heat and two cool on conventional systems, which is a cleaner specification than general-purpose units that just happen to accept heat pumps.
Owners rate it as straightforward to set up and accurate on staging, which is the part that actually matters. In two-stage operation, stage 2 is the point where backup heat typically begins, so a thermostat that understands the stages can hold that transition deliberately rather than reacting to a thermostat location that reads cooler than the rest of the house.
It runs on two AA batteries, which is unusual in a Wi-Fi thermostat and a genuine advantage. If power drops, the unit keeps its schedule rather than losing control of the system until someone restores power.
The trade-off is the display. It is a plain monochrome screen without the richer on-screen information of the higher-end Honeywell models, and the on-device interface is correspondingly simple.
What to check before you buy the Lyric T6 Pro
Count your stages. If your heat pump runs two heat and one cool, this fits. If it runs three heat stages, you need to step up, because this unit tops out at two.
Confirm a C wire is present or plan to add one. Wi-Fi functionality depends on it in many installations, which can push the install cost above the thermostat.
Who should skip the Lyric T6 Pro
Skip it if you want a color touchscreen, humidity control, or remote sensor inputs. None of those are part of this package.
Skip it if you rely on battery backup. While it runs on AA batteries here, that is not true across the whole category, so do not generalize this model to others.
6. Google Nest Learning Thermostat 4th Gen – Best for Learning Schedules
Google Nest Learning Thermostat (4th gen) + Nest Temperature Sensor (2nd gen) – Obsidian
Learning thermostat with auto scheduling
Includes 2nd gen temperature sensor
Works with most 24V systems
Adaptive Eco
The Good
- Learning algorithm builds a schedule that improves after a few weeks
- Included temperature sensor fixes rooms that run hot or cold
- Typically installs without a C wire on most 24V heat pumps
- Large display readable across the room with automatic brightness
The Bad
- 4th gen mounting plate is not compatible with 3rd gen mounts
- Some systems without a C wire trigger a false no-power error
- Not ENERGY STAR rated on this model so many utility rebates do not apply
- Designed for the US market only
The Nest Learning Thermostat in its fourth generation handles most 24V systems including heat pumps, and no C wire is required in most homes. That combination is why it stays on this list despite the reservations below. If your heat pump is on an older 24V control board, this installs cleanly in a way that many competing units cannot match.
Two new features are relevant to heat pumps specifically. Natural heating and cooling learns how outdoor conditions affect indoor temperature and pauses the system when it is not needed. Adaptive Eco uses outdoor temperature to find an energy-saving away setting and returns to comfort within an hour. Both are attempts to avoid the aggressive temperature swings that make people distrust learning thermostats on a heat pump.
The included second-generation Nest Temperature Sensor is a real benefit on a heat pump, because rooms that run hot or cold relative to the thermostat location are the trigger for premature stage 2 calls. Owners upgrading from the third generation highlight better regulation once the sensor is placed well.
Ask around on r/geothermal and you will find the counterpoint. Users there report fighting Nest over aux heat and moving to ecobee for finer staging control. That is a consistent report and it points at the same weakness: learning behavior is not the same as explicit lockout control.
What to check before you buy the Nest Learning Thermostat
Confirm you are replacing a third-generation Nest. The fourth-generation mounting plate and wiring connector are not compatible, so an upgrade means new mounting hardware and potentially new wiring work.
Check rebate eligibility before you buy. This model is not ENERGY STAR rated, which makes it ineligible for many utility rebate programs that other picks on this list qualify for.
Who should skip the Nest Learning Thermostat
Skip it if you want explicit auxiliary heat lockout and stage 2 runtime thresholds. The learning algorithm manages stages on its own terms rather than under settings you define.
Skip it if Eco temperatures that drop lower than you like are a problem, or if you are outside the US. It also does not work with UK systems or a Heat Link boiler relay.
7. Honeywell Vision Pro 8000 – Best for Three-Stage Heat Pumps
Honeywell TH8321WF1001 Touchscreen Thermostat Wifi Vision Pro 8000 with Stages upto 3 Heat / 2 Cool
Up to 3 heat / 2 cool staging
Humidity and dehumidifier control
Remote sensor input
C wire required, no batteries
The Good
- Widest staging support in this group at up to 3 heat / 2 cool
- Humidity control balances comfort in ways most smart thermostats cannot
- Program Assist anticipates recovery time so the home reaches setpoint on time
- Set screw terminals are more durable than friction-lock connectors
The Bad
- Requires a C wire with no battery backup
- Setup runs a long configuration questionnaire with no guided auto-setup
- Only one remote sensor input and multiple sensors must be wired together
- Remote sensors require wiring for each additional zone
This is the thermostat to buy when your heat pump is complicated. It supports stages up to three heat and two cool, which covers heat pump systems with electric or gas backup heat as well as conventional systems. No other unit in this group carries three-stage heating.
Built-in humidity control and dehumidifier control are the features that separate it from the rest. Heat pumps dehumidify through the cooling circuit, so tying humidity to the same staging logic that controls heat is something most consumer smart thermostats simply do not offer. Program Assist and the learning algorithms anticipate recovery time so the house reaches setpoint on time rather than an hour late.
Long-term HVAC professionals rate this unit as the most capable for complex staged systems. The Total Connect Comfort app and web portal have proven stable over years, which matters if you plan to keep the same thermostat for a decade.
Wiring is the trade-off, and it is a real one. The unit requires a C wire and has no battery compartment, so a power loss leaves the system without control. Remote sensors also need wiring for each additional zone, and multiple sensors wired together average readings rather than choosing between them.
What to check before you buy the Vision Pro 8000
Confirm you have a C wire and plan for a technician. The long configuration questionnaire with no guided auto-setup mode is the single most cited reason professionals recommend installing this unit rather than attempting it yourself.
Decide how you will handle multi-room sensing. One remote sensor input is available, and additional sensors require hard-wiring and share a single averaged reading.
Who should skip the Vision Pro 8000
Skip it if you want room sensors that talk to the thermostat wirelessly, or if you want to install it yourself in an afternoon. This is the least friendly unit in the group to a DIY install.
Skip it if a simple single-stage heat pump is all you have. The staging depth here goes unused on a system that never calls stage 3.
8. Honeywell Lyric T6 – Best Warranty Coverage for Heat Pumps
Honeywell TH6320WF2003/U Lyric T6 Thermostat, 3 Heat / 2 Cool Heat Pump Or 2 Heat / 2 Cool Conventional, 4.09″ x 4.09″ x 1.06″
3 heat / 2 cool heat pump staging
2 heat / 2 cool conventional
ENERGY STAR certified
5-year warranty
The Good
- Explicitly designed for 3 heat / 2 cool heat pump systems
- ENERGY STAR certified with a 5-year warranty
- Compact 4.09 inch square footprint fits a standard wall plate
- Auto-scheduling reduces manual programming
The Bad
- Requires a C wire for power and operation
- Small plain LCD display with a limited feature set
- Alexa support is narrower than some competing models
The Lyric T6 is a simpler route to three-stage staging. It is specified for three heat and two cool heat pump systems and also supports two heat and two cool conventional systems, and it carries a five-year warranty, the longest in this group.
That warranty matters more than it looks. A thermostat that is going to sit on a wall for a decade is a low-risk purchase, but the equipment it controls is not, and knowing the thermostat manufacturer stands behind the install for five years reduces one category of risk.
Auto-scheduling removes some of the programming burden, and the compact square footprint fits a standard wall plate without leaving a gap. It is ENERGY STAR certified, which puts it in scope for utility rebate programs where the Nest in this list is not.
Ecosystem support is the limitation. Alexa is the named voice assistant, and there is no HomeKit or SmartThings support listed. If your home already runs on Apple or Samsung, that matters.
What to check before you buy the Lyric T6
Verify a C wire is available. Power source is listed as C-wire, so this is not a candidate for a panel that lacks one unless you plan to run the wire.
Count stages against your equipment. Three heat and two cool covers a lot of heat pumps, but a system with a separate emergency heat circuit may need the broader model above.
Who should skip the Lyric T6
Skip it if you need humidity or dehumidifier control, room sensors, or a larger display. This is a deliberately plain unit.
Skip it if you are deep in the Apple or Samsung smart home ecosystem. Single-assistant support is limiting compared with the Sensi and ecobee models here.
9. ecobee Smart Thermostat Essential – Most Versatile for Heat Pumps
ecobee Smart Thermostat Essential – WiFi Thermostat, Energy Star Certified
Color touchscreen
ENERGY STAR certified
eco+ with humidity detection
Works with most 24 VAC equipment
The Good
- ENERGY STAR certified at a lower tier than other ecobee models
- Compact and lightweight round design that is easy to mount
- Works with heat pumps
- boilers
- dual fuel and a wide range of 24 VAC equipment
- Free software upgrades extend the useful life of the unit
The Bad
- Power Extender Kit sold separately adding install cost
- Compatible with 85% of systems
- a smaller share than the Enhanced and Premium models
- No occupancy radar
- air quality sensor or voice speaker
- Smaller 3.74 inch screen than other ecobee displays
The Essential is the entry point into the ecobee ecosystem and it still covers heat pumps. The listed 24 VAC equipment includes gas, oil, electric, dual fuel, forced air, conventional two heat and one cool or one heat and two cool, heat pump two heat and one cool, and boilers, verified through the online compatibility checker.
It runs eco+ features with indoor humidity detection, a schedule assistant and time-of-use preheat and precool. On a heat pump, time-of-use preheat is genuinely useful, because it lets the system warm the house during an off-peak rate window and coast through the expensive hours.
Free software upgrades are an underrated feature. Owners note that they extend the useful life of the unit, and works with Apple HomeKit, Google Assistant and Alexa without any subscription.
The 85% compatibility figure is the practical limitation. That is lower than the Enhanced at 90% and the Premium at 95%, so on an unusual system you may fall outside the supported list where a pricier ecobee would have worked.
What to check before you buy the Essential
Run the compatibility checker first. At 85% support, older or non-standard systems are the ones most likely to fail this test, and that is exactly the situation where you most need a confirmed fit.
Factor in the Power Extender Kit if you lack a C wire. It is sold separately here, which adds a step the Premium and Enhanced do not require.
Who should skip the Essential
Skip it if you want the unit to sense when you are home. There is no occupancy radar, so room sensing depends entirely on an added SmartSensor purchased separately.
Skip it if your system falls outside the 85% supported list, or if a 3.74 inch screen feels small for daily use from across the room.
10. YoLink Thermostat 2 – Best for Long-Range Remote Sensors
YoLink Thermostat 2, Smart Heat Pump Thermostat, YS4004
Dual-stage heating and cooling
LoRa range up to 1/4 mile
Supports two YS8007-UC sensors
Requires a C wire and hub
The Good
- LoRa wireless range up to a quarter mile
- longer than any other unit here
- Dual-stage control with a configurable deadband
- Supports up to two remote sensors for rooms that run off
- Temperature and humidity sensors included in the box
The Bad
- Requires a separate YoLink hub sold separately
- Only four schedule slots per day with no way to add more
- No adjustable high and low temperature alerts
- App enforces the schedule with no true Hold mode
- A physical switch must be set correctly for heat pump versus gas operation
The YoLink Thermostat 2 is the outlier in this list and the only unit that communicates over LoRa rather than Wi-Fi or Z-Wave. The listed range is up to a quarter mile, and owners committed to the YoLink ecosystem report it proving more reliable than Z-Wave in smaller buildings. For a large property or a detached workshop that needs remote temperature control, that is the point of the product.
It handles dual-stage heating and cooling with a configurable deadband, which works well on a heat pump in a variable climate. It supports up to two YS8007-UC sensors, and temperature and humidity sensors are included in the box rather than sold separately, which is unusual in this category.
There is one physical switch that has to be set correctly for heat pump versus gas operation, and getting it wrong causes confusing behavior that looks like a thermostat fault but is not. Set it first, before you start trusting the schedule.
Compatibility is narrower than everyone else here. It requires a C wire for 24 VAC systems and a YoLink hub, sold separately, for full functionality, and it works with Alexa, Google Home, IFTTT and Home Assistant.
What to check before you buy the YoLink Thermostat 2
Confirm you will buy the hub and have a C wire. Both are required, and both add steps that none of the Wi-Fi units in this group need.
Count your schedule needs carefully. Four slots per day is not adjustable, and there is no way to copy settings across days, which is limiting in a home with very different weekday and weekend patterns.
Who should skip the YoLink Thermostat 2
Skip it if you need adjustable high and low temperature alerts, because a failed heat pump produces no warning. Also skip it if you need a true Hold mode, since the app enforces the schedule.
Skip it if you want the largest possible review base. The rating here comes from a much smaller pool of reviews than the Sensi and ecobee units, with recurring connectivity complaints.
Auxiliary Heat Lockout: The Setting That Decides Your Winter Bill
Auxiliary heat, also called strip heat or backup heat, is the electric resistance element inside the air handler that a heat pump calls on when the compressor alone cannot hold temperature. It runs on electricity at roughly three to five times the cost per hour of the compressor, so the number of hours it runs is the single biggest thermostat-controlled factor in a heat pump heating bill.
Heat pumps lose capacity as outdoor temperature falls, and the outdoor temperature where the compressor can no longer keep up is called the balancing point. Below the balancing point, auxiliary heat must run or the house cools down. The mistake that inflates bills is calling for auxiliary heat far above the balancing point, and that is a thermostat configuration error more often than an equipment problem.
Most of the complaints in heat pump thermostat threads trace back to this. Owners ask how to stop the thermostat from kicking on auxiliary heat so early, and the answer is nearly always to lower the auxiliary heat lockout temperature and to set a maximum stage 2 runtime. On r/ecobee, owners describe making that change under Settings, then Installation Settings, then Thresholds, where both lockouts are exposed directly. Multiple sources note this is the setting people find once they know it exists.
Can the heat pump and auxiliary heat run at the same time? Yes, and that is normal design. On a two-stage or variable system, stage 1 calls the compressor and stage 2 adds the backup element to cover the gap. Simultaneous operation is not the problem. The problem is stage 2 engaging during mild weather when the compressor has not had a fair chance to catch up.
Is auxiliary heat bad for the heat pump? No. The compressor itself is not harmed by backup heat running, and the equipment is designed to use it. What it does affect is your electricity bill, and short-cycling driven by a badly staged thermostat is the scenario that can shorten compressor life.
Two other rules of thumb matter. Outdoor temperature compensation prevents the thermostat from calling for backup heat when a sunny afternoon briefly warms the outdoor unit, and a properly located room sensor keeps stage 2 from firing because the hallway happens to be the coldest spot in the house. Both of those features exist to protect the same setting.
Heat Pump Compatibility Checklist Before You Buy
Before choosing a thermostat, gather five facts about your system. With those answers, the choice narrows immediately.
How many heat stages does your outdoor unit have? Single-stage systems work with any unit here. Two-stage systems need a thermostat that calls stage 2 explicitly. Three-stage systems limit you to the Honeywell Lyric T6 and the Vision Pro 8000.
How many cool stages? Most consumer thermostats stop at one or two cool stages, which is rarely the limiting factor.
Is it dual fuel? A heat pump paired with a gas furnace needs a thermostat that handles the changeover cleanly, and both Sensi models list auto changeover.
Does the system have emergency heat? Emergency heat bypasses the heat pump entirely and is a separate selection rather than an automatic stage.
Is there a C wire? This decides whether you are a candidate for the models that require one or the models that work without it.
One more check for ductless systems. If your heat pump is a ductless mini-split, a wall-mounted unit with its own controls does not use a 24V wall thermostat at all. Only multi-split systems with a concealed indoor unit will accept one of these thermostats, and compatibility depends on the indoor unit rather than the outdoor equipment.
How to Choose a Smart Thermostat for a Heat Pump
Start with staging depth, because it is the one requirement that cannot be worked around. If your heat pump has three heat stages, the choice is already made for you. If it is two-stage, the Honeywell Lyric T6 Pro and the Sensi Touch are both well matched. If it is single-stage, most units in this list will run it properly.
Next, look at lockout control. If auxiliary heat costs you a lot in your area, a thermostat where you can set the lockout temperature and stage 2 runtime yourself is worth more than one that decides on its own. This is the single strongest argument for the ecobee models over the learning-style alternatives.
Then consider sensors. A thermostat mounted on an interior wall reads that wall, not the house. Remote room sensors fix the resulting complaints, but they cost extra and, on some units, they require wiring. A thermostat with no sensor ports at all is fine if your system is zoned well or if you only care about a small space.
Ecosystem fit is the fourth factor and the easiest to change your mind about later. Check whether you already own a hub, because switching platforms after installing five sensors in different rooms is expensive in time. If you are not sure, the widest support is on the Sensi models, which list Alexa, HomeKit, Google Assistant, SmartThings and Vera.
Rebate eligibility deserves attention because it can offset a meaningful share of the cost. ENERGY STAR certified units qualify for more utility programs, which excludes the Nest Learning Thermostat in this list. Some utility programs also run demand-response or virtual power plant enrollment, where participating households are called on briefly to adjust their thermostat during peak events, often for a credit.
Privacy is worth a sentence. Sensi states plainly that it will not sell personal information to third parties, which is a stronger position than most competitors offer and one of the reasons the ST55 earns the top spot. Consider what your thermostat learns about when your home is empty before you connect it to a voice assistant.
If you are still narrowing the field by brand, our Nest thermostat roundup and ecobee thermostat guide go deeper on those two ecosystems specifically.
Installation: C-Wire, Power Extender Kits, and When to Call a Tech
A C wire, also called the common or C terminal, carries 24 volts of power to the thermostat so it does not have to run entirely on batteries. If your panel has a wire labeled C, RC or RH, you have what most Wi-Fi thermostats need. On a heat pump you will also see W1 and W2 for the heating stages, Y1 and Y2 for cooling stages, and a second wire for emergency heat.
Three approaches work when a C wire is missing. A power extender kit is the simplest and ships in the box with several ecobee models, using the same wire as the thermostat to send constant power. Running a new wire is the most robust and the most invasive, since it means routing cable back to the panel. Power stealing, where the thermostat powers itself briefly and then recharges, is the third option and the one most likely to cause equipment problems, including short-cycling on some systems.
Heat pump wiring changes are where mistakes cluster. Pros on heatinghelp.com frequently troubleshoot ecobee units rebooting after wiring changes on heat pump systems, and the recurring pattern is the same each time: blue to C, red to RC, white to W1. Those three connections cause more trouble than everything else combined, so make them first and check power before moving on.
Install it yourself if your system is single-stage, you have a C wire or a compatible kit, and you are comfortable identifying Y1 and W1. Call an HVAC technician if your system is three-stage, you have a separate emergency heat circuit, you need humidity or dehumidifier control wired up, or you would have to run a new control wire through finished walls.
Our general Wi-Fi thermostat guide covers the wiring question for non-heat-pump systems in more detail, since the terminal layout differs.
Frequently Asked Questions
Can you put a smart thermostat on a heat pump?
Yes. Any 24V heat pump with standard W1, W2, Y1 and Y2 terminals can run a smart thermostat, and all ten models here are manufacturer-confirmed for heat pumps. Choose based on your stage count: three-stage systems limit you to the Honeywell Lyric T6 and Vision Pro 8000, while single-stage systems work with every unit on this list.
What is the best smart thermostat for a heat pump with auxiliary heat?
The ecobee Smart Thermostat Premium gives you the most direct control over auxiliary heat, because both lockout values sit under Settings, then Installation Settings, then Thresholds. You can lower the auxiliary heat lockout temperature so backup electric heat only runs when the compressor genuinely cannot keep up, which is where most of the savings come from.
Is auxiliary heat bad for my heat pump?
No. Auxiliary heat is designed to run with a heat pump and does not harm the compressor. It runs on electric resistance at roughly three to five times the cost per hour of the compressor, so the cost is the concern rather than the equipment. Running it too often is usually a thermostat staging or lockout configuration issue.
Can aux heat and the heat pump work together?
Yes, and that is normal design. On a two-stage or variable system, stage 1 calls the compressor and stage 2 adds the backup element to cover the gap the compressor cannot close. Simultaneous operation is not the problem. The problem is stage 2 engaging in mild weather before the compressor has had a chance to catch up.
Why do some HVAC installers avoid learning thermostats?
Learning thermostats decide their own schedule rather than following explicit thresholds you set, so an installer cannot guarantee exactly when stage 2 will engage. Homeowners report fighting Nest over early aux heat and switching to ecobee for finer staging control. Non-learning thermostats are also easier to hand-set correctly on the first try.
Final Verdict: The Best Smart Thermostat for Heat Pumps
After working through all ten units, the Sensi Smart Thermostat ST55 remains the best smart thermostat for heat pumps for most households. It is confirmed for heat pumps alongside boilers and furnaces, it needs no C wire in most applications, and its review base is far larger than anything else here, which means install problems are already solved by somebody. The scheduling app and the filter and equipment alerts are simple without being bare.
The best value alternative is the Sensi Touch ST75 if you want a readable color screen and two-stage heating support and can provide a C wire. The best control is the ecobee Smart Thermostat Premium if auxiliary heat costs are your main concern and you will spend the time to set the lockout thresholds properly.
Match the thermostat to your stage count first, confirm the wiring, and then tune the auxiliary heat lockout before you judge any of them on comfort. That last step is where the savings are, and it is the one most people skip.