How do you install a 4 wire thermostat?

4:177:44How to replace a 4 wire thermostat - YouTubeYouTubeStart of suggested clipEnd of suggested clipW is for white o. Or B is for orange or blue which heres the trick. When you have an olderMoreW is for white o. Or B is for orange or blue which heres the trick. When you have an older thermostat wire that runs the blue wire in there the four wire pair you want to hook the blue to the yellow.

What are the four wires in a thermostat?

In general, the heating wire (often white), goes into the “W” port, the cooling wire (often yellow), goes into the “Y” port, the wire that sends power from the HVAC system to the thermostat (often red), goes into the “R” port, the fan wire (often green), goes into the “G” port, and the common wire (often blue), which

What is the yellow thermostat wire?

The yellow wires underneath your thermostat connect to your compressor. They control your air conditioning system. The yellow wires terminate at your compressor contactor via an air handler. The yellow wires connect to the Y terminals on your thermostat.

How many wires does a smart thermostat need?

In order to use an adapter kit, there must be a minimum of four wires currently present on your thermostat and HVAC system.