How to Add a Thermostat to a Window Air Conditioner

Are you looking for ways to make your window air conditioner more efficient? One of the most popular options is adding a thermostat. You mustn’t use an extension cord with your AC unit when installing the thermostat. 

How to Add a Thermostat to a Window Air Conditioner

This can be done by plugging it into an outlet within three feet of where you want it installed or using an extension cord that is heavy-duty enough for the power needs of your AC unit. Next, you need to know how to add a thermostat to a window air conditioner.

10 Steps to follow on How to Add a Thermostat to a Window Air Conditioner

Step One: Gather Materials

It would help if you had everything you need to add a thermostat to your window AC. First, you’ll need an AC unit compatible with this project more on that below A digital, programmable thermostat and pre-programmed remote sensor Wire caps and electrical tape Scissors/wire cutters A drill and a drill and a 1/2″ bit – Screwdriver.

Step Two: Determine if Your Ac Unit Is Compatible.

Many window air conditioners are already hooked up to a remote wireless thermostat. There will be some more information on this in the manual, so you should check there first. If you don’t have access to the manual or can not locate any thermostat on your unit, it might be easier for you to just buy a new AC unit that comes with one built-in.

Step Three: Prepare the Ac Unit.

If your compressor is not running, unplug it and let it cool down. It would help if you also were sure to turn off the “main power” switch on the side of the machine, so you don’t get shocked. Once it’s cool enough to touch, you can start disassembling the AC unit. First, remove the top casing of your AC unit by popping off all of the plastic snaps that hold it in place.

Preparing The AC Unit

Inside, you should see a bunch of coils and tubing connected in some order. It doesn’t matter how this is hooked up, but you should be sure to take note of it if you need to put it back together when you are done.

Step Four: Run the Wires

The goal here is to run all of the wires from inside your AC unit to the outside. So you’re going to want two wires running from your thermostat/remote sensor for AC power and two more for the wires that connect to your AC unit.

The best place to run these wires is through a small hole or crack in the side of your AC unit. You might have been able to find one if you removed the top casing, but just in case it’s not there, look under where your AC sits. In most cases, there is a small opening on the bottom of the unit. If not, you can always drill one yourself.

You Can Check It Out to Drain Hisense Air Conditioner

Step Five: Connect Your Thermostat and Sensors.

Now that you’ve got everything hooked up to both inside and outside of your AC unit, it’s time to plug things in! Your wireless remote sensor will get plugged into the same outlet that provides power to your AC unit. If batteries power the sensor, just put them in now.

Your thermostat should get plugged into any normal electrical outlet. It’s very important that you do not plug it into a GFCI outlet, as the thermostat will continuously send a small amount of power to your AC unit. You can use an extension cord to get this device in the right spot if necessary.

Thermostat Get Plugged Into Any Normal Electrical Outlet

Step Six: Time to Wire Things Up!

The next step is to connect your thermostat wires to the AC compressor. Some units will have quick connectors, but you will most likely need to use wire caps and electrical tape. If you are not very familiar with doing these types of projects, you might want help from somebody who has more experience. Wiring up your new thermostat might get a little tricky.

Look at your AC compressor and find where you need to connect the wires. If there are quick connectors, just attach the wires in line with them. Usually, only one wire will be hooked up to each connector. If not, look at your thermostat’s manual for help identifying which ones are which if it isn’t too clear. If you want to find out more about how to add a thermostat to a window air conditioner, keep reading.

You Can Check It Out to Install a Hard Start Kit on Air Conditioner

Where Is the Thermostat Located on a Window Air Conditioner?

Air conditioners, both window-mounted and central, contain a built-in thermostat to regulate the temperature. The thermostat in a window AC unit is usually either in a small metal box affixed to the top of the device or in a plastic case around one side of it. If you need to add a remote thermostat, use the existing thermostat or install one in its place.

Thermostat Located On a Window Air Conditioner

Replacing it ensures that the AC unit is still safe to leave unattended. Thermostats on a window AC unit turn the device on and off to maintain a constant temperature. If you don’t have a thermostat, set or buy one for your AC to control it manually while you’re home. Turn the AC down when no one is in the room, and turn it up a few hours before you get home.


A window air conditioner with a thermostat is the perfect solution for those who want to cool their home without purchasing and installing an AC unit. Now that you know how easy it is to add a remote thermostat, we recommend using these tips before installing your new addition.

Take measurements of where you plan on placing the appliance so that there isn’t any trouble fitting it into place or blocking windows or doors when closed. You may also need help from someone taller if this will be placed in high areas like bedrooms as they can both provide assistance and make sure everything fits appropriately.

Once installed, use our suggestions below about what settings work best for different rooms and seasons! Remember: If anything seems off or doesn’t look right, you can always call a professional to help with the installation. In contrast, this article was mainly about how to add a thermostat to a window air conditioner.

Check it out also – How to Hang Curtains Around a Window Air Conditioner .

Smart Home Pick