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How many wires do I need to install ecobee3?

How many wires do I need to install ecobee3?

If your system is: 

Heat-only: then you need 3 wires (no PEK)

Cool-only: then you need 3 wires (with PEK)

1-Heat + 1-Cool: then you need 4 wires (with PEK)

The Power Extender Kit (PEK) is included in the ecobee3 box and makes it easy to install ecobee3 without running extra wires from your HVAC to the thermostat location.

To fully ensure compatibility, please use our compatibility tool or email support@ecobee.com.

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