One of the most essential items in your home is the thermostat. The ability to control the temperature is what makes your house habitable, even on the warmest summer days and the frigid winter days.

According to the EIAs Residential Energy Consumption Survey, 12% of households in the United States have a centrally controlled air-conditioning unit. 33 million North American houses rely on smart thermostats for temperature control.

Smart heating and cooling systems allow users to save energy through monitoring and effectively controlling usage. They also allow us to restrict the use and reduce the need for human engagement, making energy conservation easier. Smart home market research shows that smart heating and cooling systems save users 50% of their energy consumption.

With the development of smart homes, an increasing number of Americans are gaining control over their home’s HVAC system. Understanding how to wire a thermostat is essential knowledge for every homeowner. If your thermostat fails, you may be able to repair it yourself to save time and money. If you would prefer to use a professional, then this information will help familiarize you with the wiring process.



Wiring a thermostat is basically connecting the correct-colored wires to the correct terminal. Understanding what each wire is for is critical to complete the procedure successfully. If you are unsure of any of the thermostat wiring, it is safer to contact a qualified professional.


 Always check the manufacturer’s instructions before doing any wiring. The wiring for thermostats can be configured in a variety of ways. The most popular ones, which range from 2 to 5 wires are covered below. If you have more than 5 wires, you have more control points or you have a heat pump.

TWO WIRES           

If you have two wires, you almost certainly have a digital thermostat that solely provides heat (i.e. without air conditioning). Typically, the two wires are red and white (see above for information on where they are connected).


This is the most common configuration for a digital thermostat that connects to (and controls) a boiler. There is a 24-volt hot wire, a 24-volt common wire, and a white wire.

 FOUR WIRES         

This is a popular configuration for a battery-powered thermostat or a digital thermostat that solely regulates heat. The standard configuration consists of 24-volt hot (red), 24-volt common (blue), heat (white), and a fan (green).

 FIVE WIRES           

This is the most typical thermostat wiring style, and it applies to systems that regulate both heat and air conditioning. The wires are typically arranged as follows: red for 24-volt hot, white for heat, yellow for cooling, green for the fan, and blue for common (although the common wire may be a different color).



You can also refer to the Conductor Color Chart (see Chart 6, thermostat wire).


Syston Cable offers Thermostat Cables in 18 AWG & 20 AWG from 2 to 10 conductors configurations in UV Sunlight Resistant Riser-rated and Premium Plenum-rated cables.

Visit our webpage for all the Thermostat Cable we have to offer:



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