Conventional (furnace and air conditioning)
Supports up to 2 stages of heat and cool.

✓

✓

✓¹

Heat pumps
Support for air-to-air and geothermal heat pumps.
Supports up to 4 stages of heat (2-stage heat pump, 2 stage auxiliary heat) and 2 stages of cool.

✓

✓²

✓³

Boilers (boiler radiant "heat-only" system)
Supports up to 2 stages of heat.
Not compatible with the PEK. C wire or third-party components required.

✓⁴

✓⁴

✓⁴

Dual transformer (boiler and air conditioning)
Supports up to 2 stages of heat and cool.
Not compatible with PEK.
C wire must come from the air handler, not the boiler.

✓⁵

X

X

Single-speed fan

✓

✓

✓

Multi-speed fan
Supports:

• Non-proprietary multi-speed fan systems with multiple "G" wires (G1, G2, G3)
• 2-pipe or 4-pipe fan coil units (FCUs), with or without Auxilliary Heat
• Multi-speed PTAC (Packaged Terminal Air Conditioner) systems

Incompatible systems: dual-transformer systems; installations that require the Power Extender Kit; fan coil units that require the G1, G2, and G3 wires to be energized simultaneously for high-speed fan; AC systems with multi-speed fan.

✓⁵

✓⁵

X

HVAC accessories (humidifiers, dehumidifiers, ventilators, HRVs, ERVs)
ecobee Smart Thermostat Premium supports dual accessory (please note: this is an option only accessible via the “Pro” set-up as it requires advanced system knowledge)

✓

✓⁶

X