Best 5 Smart Thermostats of 2026: ecobee, Nest, Honeywell and More Compared

The ecobee Smart Thermostat Premium is the most complete package in this category. It ships with a SmartSensor you can place in a bedroom or office, and the thermostat uses both its own readings and the sensor's to balance comfort in the rooms that are occupied. Built-in radar occupancy sensing helps it tell when people are home, and an onboard air quality monitor tracks conditions such as VOCs and humidity and can nudge you to ventilate.

It is also a capable smart home hub on the wall. Alexa is built in, it works with Siri through a HomePod, and ecobee lists compatibility with Apple HomeKit, Samsung SmartThings and IFTTT. The 4-inch color touchscreen is easy to read, and dual-band Wi-Fi makes it less fussy about routers than many 2.4 GHz-only devices. ecobee claims its eco+ features can save up to 26 percent on heating and cooling costs, though your results will depend on your home and climate.

Installation is approachable for DIYers. The thermostat requires 24VAC power, but ecobee includes a Power Extender Kit for homes without a C-wire, so you do not have to run a new wire. The warranty is three years, longer than Google's or Honeywell's retail coverage. The only real drawbacks are that conventional systems top out at two heating and two cooling stages, and some of the newest features work best with an ecobee subscription. For most households, though, nothing else balances comfort, smarts and compatibility as well.

Nest invented the learning thermostat, and the fourth generation is the most refined version yet. Google's Smart Schedule watches how you adjust the temperature and builds a schedule automatically, then fine-tunes it based on weather and whether anyone is home. The redesigned domed display is larger than before and can show time, weather or air quality from across the room, and Soli-based motion sensing wakes the screen as you approach.

For the first time, every unit comes with a Nest Temperature Sensor (2nd gen) in the box, so you can prioritize a bedroom at night or a home office during the day without extra purchases. The new backplate expands compatibility, and Google lists support for up to three heating and three cooling stages on conventional systems and up to five heating and three cooling stages for heat pumps. Google says most homes can install it without a C-wire thanks to a built-in rechargeable battery, though a C-wire remains the most reliable option.

Matter certification is a welcome change: the thermostat now works with other Matter-compatible apps, not just Google Home. The main downsides are a two-year retail warranty, shorter than ecobee's, and the fact that setup and the richest features still run through the Google Home app. If you want a thermostat that mostly programs itself, this is the one to beat.

The X8S replaces Honeywell Home's popular T9 and brings the brand's thermostat line up to date. Its most distinctive trick is video doorbell integration: when paired with a compatible Ring or First Alert VX1 doorbell, you can see and talk to a visitor right from the 5-inch touchscreen on the wall. That screen is also customizable in color and style, so it can blend with your decor rather than look like a piece of utility hardware.

Comfort features are strong. An onboard radar sensor detects occupancy, and the bundle we recommend includes a wireless room sensor for balancing temperatures between rooms. The X8S supports humidity and ventilation control for homes with the right equipment, works with heat pumps up to four heating and two cooling stages, and is ENERGY STAR certified and eligible for many utility rebates. Matter certification means it plays well with Alexa, Google Assistant and Apple Home, and it supports both 2.4 and 5 GHz Wi-Fi.

The catch is installation. A C-wire is required, and Honeywell sells the adapter separately rather than including one in the box, unlike ecobee. The warranty is two years. If you already have a C-wire or a compatible video doorbell, the X8S is an excellent, modern alternative to ecobee and Nest with the widest platform support of the group.

Sensi, now part of Copeland, has a long history in HVAC controls, and the Touch 2 reflects that practical background. It is a thin, minimalist color touchscreen thermostat that focuses on doing the core job well: flexible scheduling, remote control from the Sensi app, filter reminders, smart alerts and usage reports that show daily and historical heating, cooling and fan runtimes.

Compatibility is broad. Sensi describes it as universal for single-stage, multi-stage and heat pump systems, and it integrates with Alexa, Google Home and Samsung SmartThings. If you want room-by-room comfort, Sensi sells Room Sensors that report temperature and humidity from other spaces, plus an outdoor sensor. The company estimates owners can save about 23 percent on HVAC energy through scheduling and remote access, and the three-year warranty matches ecobee's.

What holds it back is that it lacks the occupancy sensing and learning features of the top three, and room sensors are extra. Sensi notes that a C-wire is the standard connection, with an optional C-Wire Kit for homes that do not have one. Apple Home is not listed among supported platforms. For homeowners who want a dependable, good-looking thermostat without subscriptions or complicated automation, the Touch 2 is a solid choice.

Amazon's own thermostat is built on Honeywell Home thermostat technology and aimed squarely at Alexa households that want the basics at a low cost. Setup runs through the Alexa app, which walks you through wiring, and once it is installed you can change the temperature by voice from any Echo device or create routines alongside your lights and plugs. It is ENERGY STAR certified and includes scheduling, auto-away based on your phone's location, vacation mode, and alerts for issues such as freezing temperatures.

It works with most 24V heating and cooling systems, including conventional forced air, heat pumps and radiant boilers, but not with high-voltage electric baseboard heat. Physically it is a compact, plain white square with an illuminated display, which makes it easy to mount over most old thermostat footprints.

The low price comes with real tradeoffs. A C-wire is required, so many older homes will need the version bundled with Amazon's C-Wire Adapter. There is no built-in microphone or speaker, so voice control requires a separate Alexa device, and there are no remote room sensors or occupancy detection. The warranty is one year. If you simply want app and voice control without paying for premium features, it is the most affordable way into smart heating and cooling.