How many thermostat wires

Contact Support. Skip to Main Content. Home Topics. Expand search. Search Search. Thermostats Compatibility. How many wires do I need to install an ecobee thermostat?

Type of system Minimum wires needed PEK compatible? Accessory control If you wish to use your ecobee4 or ecobee3 to control a humidifier, dehumidifier, or ventilator, additional wiring may be needed. Featured Topics. Product Resources. So, this is what you might expect to see in terms of colored wires and what they mean: White — The white wire is what connects to the auxiliary heat on your system.

Yellow — The yellow wire connects to your compressor. Green — The green wire connects to the fan. Orange — This wire connects to your heat pump if you have one. They just get a little more sophisticated so if you are pre-wiring a new home, check with the contractor providing the HVAC system as to what thermostat wiring is required.

A new system may need as many as ten wires like a two-stage heat, two-stage cooling system, heat pump reversing valves, fan control, etc. These additional terminals are not shown in this diagram. Now that you are armed with a basic understanding of the temperature control system in your home, you should now be able to identify what kind of system you have, and what type of functions you will need if replacing or up-grading your existing thermostat.

I hope this article helped with your question about thermostat wiring. Thanks for taking the time to read it! If you have any questions or comments on your furnace situation, feel free to add a comment below.

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