Ecobee smart thermostats are compatible with the vast majority of standard residential HVAC systems, but they are not compatible with proprietary communicating systems (such as certain high-end modulating furnaces requiring proprietary manufacturer digital data cables), line-voltage systems (such as 120V or 240V baseboard heaters), or specialized millivolt systems like old gas wall furnaces without transformers. Furthermore, heat pump systems lacking a common C-wire may experience severe power starvation issues unless an external power extender kit (PEK) or dedicated C-wire is installed. Verification: Inspect your existing thermostat wire terminal labels and furnace control board wiring to ensure compatibility before attempting installation.
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