The Best Smart Thermostats (2027)

The Ecobee Premium wins because it solves the problem people actually complain about: rooms that never match the thermostat. The included SmartSensor with occupancy detection heats and cools based on where people are, not where the hallway unit hangs. Add built-in air quality monitoring, voice assistants, and eco+ rate optimization, and it is the most complete thermostat here, with the sensor in the box closing the value gap against cheaper rivals.

Nobody does set-and-forget like Nest. The 4th Gen learns your schedule from a week of adjustments, Soli radar sharpens home/away detection beyond phone geofencing, and the Energy History shows the savings in plain numbers. It is the pick for people who never want to program a schedule again, and the stainless design suits homes where the thermostat is visible.

The T9 room-sensor system supports up to 20 sensors, more than anyone else, which makes it the pick for large or awkward floor plans where one sensor cannot cover the variance. Occupancy-aware sensors plus multi-user geofencing handle the stop adjusting the thermostat family war. The included C-wire adapter also smooths installs on older systems.

For Alexa households, the Amazon Smart Thermostat delivers the core savings, scheduling, geofencing, usage tracking, at a fraction of the premium price. Alexa Hunches automates the obvious adjustments. The C-wire requirement and Alexa-only focus limit it, but as a first smart thermostat it is unbeatable value.

The Sensi Touch 2 solves the most common smart thermostat headache: no C-wire in the wall. It runs on HVAC system power in most homes where rivals demand rewiring, and the big color touchscreen plus room sensor support cover the essentials. No learning algorithm, but for older homes it is the path of least resistance.

This is the Nest for people who balk at the Learning Thermostat's price: mirrored display, Energy History, Home/Away Assist, and no C-wire needed in most systems. You lose auto-learning and room sensors, but the core Google Home experience and the energy reports remain, at the lowest official Nest price.

Every other thermostat here assumes a central furnace; the Mysa V2 is built for the millions of homes on 120V/240V electric baseboards. Per-room zoning turns each heater into its own zone, which is where the real savings come from. If your heat is electric and room-by-room, nothing else on this list even applies.

The ecobee3 lite keeps the two features that make Ecobee worth buying, room sensor compatibility and eco+ optimization, while skipping the Premium's voice assistant tax. The included Power Extender Kit solves the missing C-wire problem. For balanced comfort without flagship pricing, this is the sweet spot.

Essential strips Ecobee to its essence: full app scheduling and eco+ optimization at the brand's lowest price. No room sensors and no voice assistant, but the energy-saving software is the same. First-time buyers get the Ecobee experience and the utility-bill savings without the premium outlay.

The Sensi Lite is for everyone who finds smart thermostats overcomplicated: physical buttons, a backlit display, app-based 7-day scheduling, and usually no C-wire needed. No account required, no learning curves. Landlords love it because tenants cannot break it, and it costs less than a dinner out.