Best Smart Thermostats of 2026
A smart thermostat is one of the highest-ROI smart home upgrades you can make — learning your schedule, trimming energy bills by up to 23%, and giving you full control from your phone. We tested the top models in 2026 to find which ones are actually worth buying.
How we ranked them
We evaluated every thermostat on ease of installation, ecosystem breadth (Alexa, Google Home, Apple HomeKit, Matter), scheduling intelligence, energy reporting quality, C-wire requirements, and value. Both finalists are Matter-certified, which means they work across all major platforms — not just one. See also our best Apple HomeKit devices and best Google Home devices, or browse all smart home devices.
The verdict
For most people in 2026, the Ecobee Smart Thermostat Premium is the better buy — its air quality monitoring and SmartSensor-based room balancing solve real comfort problems the Nest cannot. If you're deep in the Google ecosystem and want the cleanest, most automated experience, the Nest Learning Thermostat 4th Gen is still the most elegantly designed product in the category.
Top smart thermostats
Ecobee
Ecobee Smart Thermostat PremiumSmart thermostat with room sensors, air quality monitoring, and built-in Alexa.
- +Indoor air quality monitoring — CO2, VOC, humidity, and particulates
- +SmartSensor balances temperature from actual occupied rooms, not the hallway
- −Always-on built-in microphone — not ideal for privacy-conscious households
- −C-wire required; included Power Extender Kit adds steps for older systems
- +Auto-schedules itself
- +Sleek design
- −Pricey vs. basic smart thermostats
- −C-wire often required