In this post we teach the 4 wire thermostat wiring color codes and how to understand what they mean when installing your thermostat. The information we have on thermostat wiring is valid for both smart thermostats and older style manual thermostats.

We teach you what you need to know to wire your new Nest Thermostat, Ecobee or other smart thermostat and what the thermostat wiring colors mean and how they work.