Best Thermostats for Home Assistant: Top Picks 2026

Installation runs through a video walkthrough inside the companion app, and most single-zone systems can be swapped in around 45 minutes without a technician.

• Step-by-step guided install through the mobile app
• Bluetooth 5.0 used during the pairing process
• Compatible with the wiring found in most forced-air and heat pump systems
• Glass-front touch display replaces the existing wall thermostat

Systems with unusual staging, such as multi-stage heat pumps or zoned dampers, should be checked against the compatibility tool before ordering. A built-in level also helps square the wall plate during mounting, before wiring is connected to the equipment terminals.

Alexa is built directly into the thermostat, so voice commands for temperature, weather or music work without pairing a separate smart speaker.

• Built-in Alexa for hands-free control and Alexa Calling
• Dual-band Wi-Fi and far-field microphones for voice pickup across a room
• Mobile app control from a phone, tablet, computer or compatible watch
• Works with Google Assistant and Siri Shortcuts alongside Alexa

Because the microphone is always active for wake-word detection, households that prefer a silent thermostat can mute the mic through the on-screen settings.

A single SmartSensor ships in the box and reports occupancy and temperature from wherever it is placed, letting the thermostat favor an occupied bedroom over an empty hallway at night.

• Included SmartSensor for room-level occupancy detection
• Additional sensors can be added to cover more rooms
• Integrates with SmartThings, Apple HomeKit and IFTTT routines
• Reports energy usage patterns through the companion app

Multi-room comfort depends on how many sensors are placed around the home, since the single included unit only tracks one room by default.

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Sensi builds this model specifically around a self-install, and two design choices make that realistic.

• No c-wire in most homes. Where most smart thermostats demand a common wire for constant power, the ST55 runs from batteries or a c-wire, so many older systems work untouched.
• Same footprint. At 5.88 x 3.75 x 1.0 inches it covers the area a traditional thermostat left behind, which usually means no filling, sanding or repainting.
• Built-in level in the backplate so it goes on straight first time.

The app walks you through wire by wire: photograph the existing terminals before you disconnect anything, label each wire, then follow the on-screen prompts. Kill power at the furnace breaker first. Most installs run 20 to 30 minutes.

Sensi states the ST55 works with the HVAC equipment found in most homes, but a few checks are worth doing before ordering.

• Photograph your wiring and run it through Sensi's compatibility checker. Conventional gas, oil and electric systems plus most heat pumps are covered.
• Power: batteries or c-wire. This is the key difference from the Sensi Touch models, all of which require a c-wire.
• Wi-Fi: 2.4GHz only. If your router merges 2.4 and 5GHz under one name, split the bands temporarily to get through setup.
• Apps: requires a phone with the Sensi app; Alexa works for voice control.

Systems with proprietary controls, multi-stage setups beyond the supported configuration, or line-voltage baseboard heating are the usual exclusions - check those before buying.

The claimed 23% saving on HVAC energy is not automatic - it comes from actually using the scheduling features.

• Flexible schedules: drop the temperature during working hours and overnight, and bring it back before you wake or arrive home.
• Remote access: turn the heating on from the road if plans change, or off entirely when a trip runs long.
• Usage reports: monthly runtime data shows where the hours are actually going, which is how you find an oversized or short-cycling system.
• Maintenance alerts: filter change reminders and equipment alerts, which quietly protect efficiency over years.

Day to day it behaves like a normal thermostat with buttons and a keypad lockout, so guests, children and less technical household members are not stuck. Emerson also commits to not selling your personal data - unusual in this category.

This thermostat starts with a simple schedule and lets you adjust it anytime from the companion app on a phone, laptop, or tablet. An Away Assist feature switches to an eco temperature automatically once everyone leaves, so an empty home is not heated or cooled the same as an occupied one.

• Self-learning schedule that can be edited manually at any point
• Away Assist switches to an eco setting when the home is empty
• Remote access from a phone, laptop, or tablet over Wi-Fi
• An on-screen indicator appears when a chosen temperature is set to save energy

Full functionality requires a stable Wi-Fi connection and a phone or tablet running iOS or Android, plus a free account for the companion app.

Installation typically takes about 60 minutes or less, and the required hardware is included in the box along with a trim plate that helps cover marks left by a previous thermostat. The plastic body and frosted display are designed to sit flush against most wall styles.

• Typical install time of around 60 minutes with included hardware
• Compatible wiring covers common heating and cooling setups
• Built-in HVAC monitoring flags issues with the connected system and offers maintenance reminders
• Works alongside an optional, separately sold room temperature sensor for wiring into multi-zone homes

Anyone unsure about their wiring type should check compatibility before installing, since not every older HVAC system is supported.

The thermostat works with Alexa, Google Assistant, and other smart speakers, so temperature changes can be spoken instead of tapped into an app. It suits households that already run a smart speaker or two and want one more device tied into that same routine.

• Voice control through Alexa, Google Assistant, and other compatible smart speakers
• Frosted display designed to blend into a range of wall colors and room styles
• Energy History in the app shows how much energy was used and offers suggestions to reduce it
• A separately sold room sensor extends control to bedrooms or offices away from the main unit

Households without an existing Wi-Fi network or smart speaker will get less use from these features than ones already set up with a connected home.

This thermostat is built to work with roughly 90% of 24VAC HVAC equipment, covering gas, oil, electric, dual-fuel, forced-air conventional systems up to 2 heat/2 cool, heat pumps up to 3 heat/2 cool, and boilers. A Power Extender Kit and trim kit are both included in the box for homes without an existing C-wire.

• Compatible with 90% of 24VAC HVAC systems
• Power Extender Kit and trim kit included
• Not compatible with line-voltage (110/220V) or millivolt/0-10VDC systems

Checking wire labels against the manufacturer's own compatibility checker before installation is worth doing, since the excluded system types above are common enough in older homes to catch buyers off guard.

A built-in radar sensor detects occupancy and can preheat or precool a space ahead of arrival, then automatically shifts settings based on whether the home is occupied or everyone is asleep. The system also factors in humidity when adjusting temperature, aiming for comfort beyond a simple set-point schedule.

• Built-in radar occupancy detection
• Automatic preheat/precool before arrival
• Humidity-aware temperature adjustment
• Optional SmartSensors detect occupancy room by room

Room-level SmartSensors are sold separately from the main thermostat, so multi-room occupancy detection beyond the thermostat's own built-in sensor requires an additional purchase.

Control is available through the ecobee app from a smartphone, tablet, or Apple Watch, and voice control is supported through Siri, Alexa, and Google Assistant. The unit is hardwired rather than battery-powered, which removes the risk of losing control if batteries die, but also ties installation to the home's existing HVAC wiring.

• App control from smartphone, tablet, or Apple Watch
• Voice control via Siri, Alexa, and Google Assistant
• Hardwired power, no batteries to replace
• Metal housing, 4.09 x 4.09 x 0.94-inch footprint

Because it's hardwired, installation is a DIY electrical task rather than a simple mount-and-go swap, though the included Power Extender Kit is meant to cover most common wiring gaps found in older thermostat setups.

The LITE model is built for electric baseboard heaters, fan-forced heaters, wall heaters, and convector units running on 120V, 208V, or 240V circuits, and it supports both single-pole and double-pole wiring configurations. Installation is DIY-oriented: the in-app guide walks through each wire connection step by step, with most homes needing no electrician.

• Requires 4 wires at the switch box — a neutral wire or second live wire is mandatory
• Typical install time runs about 15 minutes once wiring is confirmed compatible
• Housed in a 2.48"D x 4.65"W x 6.02"H plastic faceplate that fits a standard switch box

Before ordering, check your existing wiring against the app's compatibility guide, since homes without a neutral or second live wire at the baseboard will need rewiring first.

Once connected to your home Wi-Fi, the Mysa LITE runs 7-day custom schedules per room and drops temperature automatically during set away periods. Control runs through the free Mysa app on iOS and Android, and every scheduling and monitoring feature is unlocked at setup with no recurring subscription or paywalled tier.

• Pairs with Apple HomeKit, Amazon Alexa, and Google Home for voice-based temperature changes
• Monthly runtime report emails break down energy use by room so schedules can be compared over time
• Touch controls on the unit itself allow manual adjustment without opening the app

Because there is no separate hub, all remote and voice features rely on a stable home Wi-Fi connection — if your router goes down, only local touch control keeps working.

This thermostat suits households heating individual rooms with electric baseboard, fan-forced, or convector units who want per-room scheduling without adding a central hub to the setup. It works well for anyone comfortable following an in-app wiring guide, since most installs are designed to be completed without calling an electrician.

• Good fit for renters or homeowners replacing an existing mechanical baseboard thermostat one room at a time
• Well suited to multi-room homes where different schedules per room matter more than centralized HVAC control
• Less suited to homes with only 2-wire baseboard circuits, since a neutral or second live wire is required

Anyone managing central 24V HVAC systems instead of baseboard heat should look at the 24V Mysa variant rather than this LITE model.

This thermostat works with forced air systems running on gas, oil, or electric, along with hot water, steam, and heat pump systems that include electric backup. It requires a C-wire for continuous power, so homes without one may need a C-wire power adapter added during installation before the thermostat can run.

• Compatible with gas, oil, and electric forced air systems
• Supports heat pump systems with electric backup, though not standalone electric baseboard heat
• C-wire requirement means some older HVAC setups need an adapter before installation

It is explicitly not compatible with electric baseboard heat systems running 120-240V, so checking existing wiring against the compatibility list before buying avoids a mismatched install.

A customizable color touchscreen can be set to match a room's decor, and 7-day programmable scheduling allows different routines for weekdays versus weekends rather than one fixed daily schedule. The thermostat connects over Wi-Fi and pairs with the companion app for remote schedule changes, plus voice control through Alexa or Google Assistant.

• 7-day programming supports separate weekday and weekend routines
• Wi-Fi connectivity enables remote schedule and temperature adjustments from a phone or tablet
• Alexa and Google Assistant compatibility adds voice-based temperature control

Because full functionality depends on a Wi-Fi connection, remote features and app-based schedule changes are unavailable if the home network goes down, though the local touchscreen schedule keeps running.

This thermostat is ENERGY STAR certified and generates monthly energy reports covering heating and cooling activity, along with personalized tips aimed at reducing overall energy use. Intelligent alerts flag air filter and humidifier pad change reminders, plus notifications for extreme high or low indoor temperature and humidity readings.

• Monthly energy reports track heating and cooling activity over time
• Filter and humidifier pad change reminders reduce the chance of forgotten maintenance
• Alerts for extreme temperature or humidity swings flag potential equipment issues early

Local weather forecasts display directly on the touchscreen, with 5-day forecasts available through the companion app for planning heating and cooling needs ahead of time.

This thermostat ships with an included SmartSensor that reports room-by-room temperature and occupancy back to the main unit, helping it adjust based on which rooms are actually in use rather than relying on the thermostat's own location alone. A built-in air quality monitor tracks indoor air conditions and reminds users when it is time to change the furnace filter.

• Included SmartSensor for remote room temperature and occupancy
• Built-in air quality monitoring with filter change reminders
• Radar-based occupancy sensing built into the thermostat body
• ENERGY STAR certified

The display uses a large screen with a metal housing, built to show detailed readouts alongside quick controls for temperature, fan mode, and connected accessories.

This thermostat is stated to be compatible with roughly 95% of 24VAC HVAC systems, covering furnaces, air conditioners (2H/2C), heat pumps with up to 2-stage auxiliary heat, boilers, PTACs, and fan coil units with up to 3 fan speeds. A Power Extender Kit (PEK) and Trim Kit are included in the box for systems that need them during a DIY install.

• Compatible with about 95% of 24VAC HVAC systems
• PEK and Trim Kit included for systems without a C-wire
• Supports 2-stage heat pumps and 3-speed fan coil units

Anyone unsure whether their specific system qualifies can check the published compatibility checker before installing, since the remaining share of systems may need a different approach.

The thermostat connects over Wi-Fi and works with Alexa, Siri, and Google Home for voice control, with a built-in speaker for responses and audio playback. Pairing it with a wired Smart Doorbell Camera adds a live video feed and two-way talk directly from the thermostat's screen.

• Voice assistants: Alexa, Siri (Apple Home hub required), Google Home
• Built-in speaker for voice responses and audio
• Optional pairing with a wired Smart Doorbell Camera

Siri control specifically requires an Apple Home hub elsewhere in the home, and the doorbell integration depends on owning and wiring the separate camera accessory, so both of those features rely on additional hardware beyond the thermostat itself.

Most homes can install this thermostat using existing thermostat wiring, without needing a dedicated C-wire, since the unit is designed to work off standard heating and cooling wire sets in typical setups. Certain system types are the exception.

• Heating-only, cooling-only, zone-controlled and heat pump systems typically need a C-wire or a separate power accessory
• The compact 3.3 x 3.3 x 1.21-inch body is sized to cover most existing wall plates without repainting or patching
• An online compatibility checker tool lets buyers confirm their HVAC system before ordering

Installation is designed as a self-install completed in roughly 30 minutes on compatible systems, though anyone with an unusual multi-zone setup should check compatibility first and plan extra time for a possible C-wire run.

The thermostat connects over dual-band Wi-Fi, supporting both 802.11b/g/n on 2.4GHz and 802.11a/n on 5GHz, plus Bluetooth Low Energy for initial pairing. Once connected, schedules and temperature changes are managed through the Google Home app rather than a dedicated thermostat app.

• Family members can each adjust the temperature remotely from their own phone, laptop or tablet
• Custom heating and cooling schedules are built directly in the Google Home app
• The unit has no physical lock feature, so in-person changes at the wall are not restricted by a passcode

Remote control and notifications depend on a working internet connection and Wi-Fi signal reaching the thermostat's mounting location, so a weak spot near the wall plate can interrupt remote access.

This is an ENERGY STAR certified thermostat with built-in HVAC monitoring that watches for signs of a potential issue with a compatible heating or cooling system and can send an alert through the app. The monitoring is meant to flag possible problems early, not replace a diagnosis from a qualified HVAC technician.

• The thermostat can turn itself down automatically when the home is empty to cut unnecessary heating or cooling runtime
• A built-in schedule-suggestion feature looks at usage patterns and proposes schedule tweaks
• Voice control is available through a compatible smart speaker, requiring a working internet and Wi-Fi connection

Alerts and monitoring features apply only to HVAC systems compatible with this feature set, so older or non-standard systems may not receive the same level of diagnostic feedback.

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