6 Best Smart Thermostats Under $150 in 2026

The ecobee Essential is a Wi-Fi thermostat with a color touchscreen and a polished app, and the maker says it is compatible with around 85 percent of systems. An online compatibility checker on the ecobee support page lets you confirm your wiring before you buy. The listing also cites yearly heating and cooling savings of up to 23 percent, a claim that depends on your habits and home.

Tapping the screen or opening the app changes the temperature, and free software upgrades keep the features improving. The tradeoffs are fewer advanced features than the Enhanced or Premium ecobee models and some dependence on your system's wiring. It is ENERGY STAR certified, which may qualify you for utility rebates.

Compared with the Nest, it gives you a bigger color screen and a stronger compatibility tool. Against the Sensi ST55, it feels more polished but is less budget-focused. Pick it if you want a modern look and a reliable app.

The Nest Thermostat is the simplest-looking option in the lineup, with clean lines and finishes in charcoal, snow and sand. It is designed to work without a C wire in most homes, though heating-only, cooling-only and zone-controlled systems can still need extra wiring. It turns itself down when it senses you have left, and the listing notes ENERGY STAR certification.

The design is the draw, along with a quick setup and a clean app. The tradeoffs are no automatic learning-based scheduling on this version and a more limited feature set than ecobee models. Compatibility with your HVAC system is worth confirming first.

Compared with the ecobee Essential, it gives up the color touchscreen but keeps its modern look. Against the Amazon thermostat, it does not require a C wire in most installs. Pick it for a tidy wall and a simple routine.

The Sensi ST55 is a DIY-friendly thermostat with a built-in level and step-by-step app instructions that make mounting straightforward. It works with HVAC equipment found in most homes, offers flexible scheduling and geofencing and carries ENERGY STAR certification. The maker also states it will not sell your personal information to third parties.

The scheduling interface is uncomplicated, which suits people who want a thermostat that does what it says. The tradeoffs are fewer advanced scheduling options than ecobee or Nest and a need to check whether your system requires a C wire. The listing says it works without a C-wire in most homes, with exceptions for certain system types.

Compared with the Sensi Lite, it adds more features. Against the Amazon thermostat, it is more flexible on wiring. Pick it if you plan to install it yourself and want clear instructions.

The X2S stands out as the Matter-certified option, controlled through the First Alert app and compatible with Alexa and Google, among others. It sends filter reminders, monitors indoor humidity and lets you choose display settings. Seven-day programmed scheduling and an auto-away feature round out the basics, and it carries ENERGY STAR certification.

Matter support means it can fit into a broader smart home without locking you into one brand. The tradeoffs are a less familiar app than the big names and a wiring check, because the listing mentions conventional and heat pump compatibility. Confirm your system before buying.

Compared with the Honeywell T5, it adds Matter and humidity data. Against the ecobee Essential, it offers a more traditional Honeywell feel. Pick it for a connected home with several brands.

The Amazon Smart Thermostat is built for people who already run Alexa and Ring. Deep native integration lets you create comfort zones with select Alexa devices, so the thermostat adjusts based on room temperature. After purchase, Amazon emails details about thermostat rebates that may be available from your energy provider.

The key limitation is the wiring, since a C-wire is required, unlike some competitors. If your system lacks one, you may need an adapter or a different model. It sits in the middle of the pack on features and does not list the same compatibility tools as ecobee.

Compared with the Nest, it relies on Alexa but needs a C wire. Against the Sensi, it offers tighter Alexa integration but less flexibility on wiring. Pick it only if you have a C wire and Alexa runs your house.

The T5 is the traditional programmable choice, with a 7-day schedule you set once or location-based control through geofencing. The listing mentions an Alexa-ready design and says scheduling feature use saved customers between 8 and 16 percent on heating and cooling bills, a result that depends on your home and habits. It also suggests checking with your energy provider about rebates.

It appeals to people who like a familiar Honeywell look and straightforward programming. The tradeoffs are fewer modern touches than the newer models and a feature set that covers the core without Matter. It fits well on a secondary system or for someone upgrading from a basic programmable unit.

Compared with the X2S, it skips Matter and humidity data. Against the ecobee Essential, it offers a familiar interface at the cost of polish. Pick it for dependable scheduling.