Best Smart Thermostats for Home Assistant 2025 – Ecobee, Nest Reviews

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Smart thermostats can save hundreds per year on energy bills while providing perfect comfort. Here are the best thermostats that work excellently with Home Assistant.

Best Overall: Ecobee SmartThermostat Premium

The Ecobee SmartThermostat Premium includes a remote sensor, built-in air quality monitor, and seamless HA integration.

Premium Features:

  • Built-in Alexa voice control
  • Air quality monitoring (VOC, CO2)
  • Remote temperature sensor included
  • Smart home/away detection
  • Works with Home Assistant local API
  • Touch screen display

This is my primary thermostat—the air quality monitoring is a game-changer. Check Ecobee Premium price.

Best Value: Ecobee3 Lite

The Ecobee3 Lite offers core smart features at a much lower price point.

Great For:

  • Budget-conscious users
  • Basic scheduling needs
  • Works with remote sensors (sold separately)
  • Home Assistant integration

Buy Ecobee3 Lite.

Best Google Integration: Google Nest Learning

The Nest Learning Thermostat learns your schedule automatically and has beautiful hardware.

Features:

  • Auto-learning algorithms
  • Premium metal design
  • Farsight display (shows temp from across room)
  • Works with HA via Nest integration

Get Nest Learning.

Budget Pick: Google Nest Thermostat

The basic Google Nest Thermostat offers smart features at under $130.

Check Nest Thermostat price.

Best Multi-Zone: Honeywell Home T9

The Honeywell T9 excels at multi-room comfort with included smart sensor.

Multi-Zone Control:

  • Included smart room sensor
  • Supports up to 20 sensors
  • Room-specific temperature targeting
  • Geofencing

Buy Honeywell T9.

Remote Sensors for Better Control

Ecobee Sensors: Ecobee SmartSensor 2-Pack

Honeywell Sensors: Honeywell Smart Room Sensor

Installation Accessories

C-Wire Adapter: Venstar Add-A-Wire (if you lack a C-wire)

Wall Plates: Decorative Cover Plate

My Top Picks

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