Every ecobee smart thermostat is compatible with over 90% of 24V heating and cooling systems. ecobee smart thermostats are compatible with the following systems: Conventional, 2- and 4-Pipe FCU, 2-pipe FCU + Auto Changeover, PTAC, Highrise Heat Pump, Aux. Heat systems, Multi-speed fan systems and systems with accessories.

Important details:

• Smart Thermostat Enhanced and Smart Thermostat Lite only support HVAC accessories connected to the thermostat by one wire.
• Smart Thermostat Enhanced does not support pipe sensors for multi-speed fan systems or two stages of auxiliary heat for heat pump systems.
• Smart Thermostat Lite does not include the Power Extender Kit (PEK), which is required for installation with some systems. The PEK is sold separately.
• For Smart Thermostat Enhanced, installing with the PEK eliminates the option for accessory control.

Until the launch of Smart Thermostat Lite, the Power Extender Kit came with each of our thermostats. In developing Smart Thermostat Lite, we noticed that the Power Extender Kit was used in less than 15% of ecobee smart thermostat installations. As reducing waste is one of our key goals as a company we decided to not include the Power Extender Kit with Smart Thermostat Lite. By not shipping Smart Thermostat Lite with the Power Extender Kit, we will prevent over 350,000 kgs (771,617 lbs.) of e-waste over the product's lifetime. Not including the Power Extender Kit also allowed us to focus on offering affordable accessory control, a feature Pros said was important to them. Certain installations will still require the Power Extender Kit, and we have made it available for easy order on our website.

Need a common wire? Grab our Power Extender Kit.

Yes, our smart thermostats' powerful features and compatibility with multi-speed mechanical systems make them the best option for multifamily housing units and commercial buildings.

Optimize Mode makes for a quieter, more energy-efficient home. It uses the indoor temperature deviation from the setpoint to automatically set fan speed to the lowest possible setting. This results in energy savings^* and improved comfort through a more evenly heated or cooled home, better indoor air quality, and reduced fan noise.

^*Per Energy Star, a 10% fan speed reduction lowers fan electrical use by approximately 25%. A 20% speed reduction yields electrical savings of roughly 45%.