Hook up thermostat

There are a variety of thermostat wire types.

The Thermostat Wiring Color Code Guide

The main difference setting each apart is the number of colored wires. HVAC systems with more functions need more wires to communicate to and from the thermostat. The 5 strands of wire provide enough functions for the modern thermostat. Read reviews and find the best prices on Amazon.


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For simple heating applications, a 2 conductor wire is sufficient. Download the Sensi app on your smart phone or tablet for easy, step-by-step installation instructions. If you are not connecting your Sensi thermostat to Wi-Fi, follow the instructions below to wire and correctly configure your thermostat for your heating and cooling equipment. Turn off the power to your heating and air conditioning system at your fuse box, or flip the switch next to your furnace.

Thermostat Wiring for Dummies

To confirm power is off, try to turn on heating or cooling by adjusting the temperature on your old thermostat. Remove the face plate using a screwdriver or by pushing the pressure latch.

Choosing the Proper Gauge: 18 or 20

Some face plates pull off while others need to be released using a screwdriver. Take a photo of your existing wiring before removing your thermostat from the wall. This is a very important step and can help if you need to troubleshoot later.

Thermostat Wiring

If you see a jumper wire on your old thermostat, remove it. Your new Sensi thermostat has the jumper wire built into the back of the thermostat faceplate. Leave all other wires connected to the thermostat.


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Use the wire labels included with your Sensi packaging to label your wires before removing them from your old thermostat. The diagram below shows how a basic 4-wire thermostat is connected as indicated by the color code chart above. The diagram shows how the wiring works.

However your connections may seem a little different on the thermostat itself.

Thermostat Wiring for Dummies – How Anyone Can Do It

Just take a look at the picture below the diagram. Some thermostat units have a dedicated R terminal and it jumpers to the RC, RH or 4 terminals internally. The W, Y and G terminals should be pretty straight forward on most all types of thermostat's. The following image is one of the most popular scenarios today. This type thermostat is relatively easy to connect or change over to a programmable type thermostat.


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As mentioned in the previous paragraph, the only difference might be the lack of an "R" connection. Now the following image here represents a heat pump system thermostat. These types systems are more involved because of the components associated with the system.

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