Home Thermostat Wiring Colors

The main difference setting each apart is the number of colored wires.

Home thermostat wiring colors. The w terminal the one that triggers the heating. The green wire connects to the fan. Red wire connects to the r terminal. The green wire connects to terminal g on your thermostat.

Types of thermostat wire. The red wire is usually the 24 vac power wire which begins at the transformer. It terminates at the air handler or furnace. The green wire underneath your thermostat connects to the fan of your furnace or air handler.

Thermostat terminal designations quick guide detail wiring color guide below. This wire connects to your heat pump if applicable. Y2 wire connects to y2 terminal and is for cooling stage 2. Rc wire connects to the rc terminal.

The yellow wire connects to your compressor. Y wire connects to the y terminal and is for cooling stage 1. Thermostat wiring color code r rh rc terminals. It connects directly to the furnace boiler or other.

There are a variety of thermostat wire types. Hvac systems with more functions need more wires to communicate to and from the thermostat. It runs to the r. Here is the industry standard thermostat wire color code used for most systems.

The orange thermostat wire links to your heat pump if you have one. The most essential colors are red green and yellow although you may find up to eight different wires in a heat pump thermostat or as few as five in a more common hot water system. The red wire is connected to terminals beginning with the letter r which include r rh and rc units depending upon how the thermostat is being used. The white wire connects to your heat.

Rh wire connects to rh terminal.