Smart thermostat compatibility checker

Compatibility is the question that decides whether a smart thermostat is worth buying, and it cannot be answered generically. Tell us what you have and we will tell you what to check.

We will not tell you a thermostat definitely fits your system. Nobody can do that from three dropdowns, and anyone who claims otherwise is guessing with your money. Use this to narrow the field, then confirm with the manufacturer's own checker before you buy.