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How to Wire a Smart Thermostat

Gregg in Illinois asks: My current wiring only has 4 wires but I understand I can use the fan wire and make it a common wire. How to Wire a Smart Thermostat, Change the Wiring for a Smart Thermostat.


Wiring a Smart Thermostat
Electrical Question: My current wiring only has 4 wires but I understand I can use the fan wire and make it a common wire.

I am trying to install a smart thermostat. My current wiring only has 4 wires but I understand I can use the fan wire and make it a common wire. The attached photo is a photo inside the HVAC. ‘Y’ is empty, ‘W’R”G’ are wired then there is a “C’ with a wire attached. On my current thermostat I have a white wire into W, Green into Green, a blue wire into Y, and a red wire into R. I’m just confused why there is a ‘C’ wire on my HVAC and not on my thermostat. Any help would be greatly appreciate. Thanks

This electrical wiring question came from Gregg, a Homeowner in Plainfield, Illinois.

Dave’s Reply:
Thanks for your electrical wiring question Gregg.

How to Wire a Smart Thermostat

Application: Wire a Smart Thermostat – Change the Wiring of a HVAC Thermostat.
Skill Level: Intermediate to Advanced – Best performed by a Licensed Electrical Contractor, a Certified Electrician or an HVAC Technician.
Electrical Tools Required: Basic Electricians Pouch Hand Tools, Voltage Tester, and appropriate Safety Gear.
Estimated Time: Depends on the personal level experience, ability to work with tools, install electrical circuit wiring, and the available access to the project area.
Electrical Safety: Identify the electrical power source to the HVAC Thermostat, turn it OFF and Tag with a Note before working with the electrical wiring.
Electrical Wiring Parts and Materials: Electrical parts and materials for the HVAC Thermostat should be approved for the specific project and compliant with local and national electrical codes.
Electrical Codes and Inspections: Installing or changing home electrical wiring should be done according to local and national electrical codes as adopted in Plainfield, Illinois. A permit and inspections may also be required.

See more about Home Wiring for Illinois

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This electrical wiring project is about How to Change the Wiring of a HVAC Thermostat that will be replaced by a Smart Thermostat.

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The Safest Way to Test Electrical Devices and Identify Electric Wires!

The Non-Contact Electrical Tester
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