How To Put An AC In A Casement Window

If you’re looking to beat the summer heat, installing an air conditioner in your casement window is a great way to cool down without having to buy a full-sized unit. Though it may seem daunting at first, putting an AC in your casement window doesn’t have to be difficult or time-consuming.

This guide will walk you through the entire process from start to finish so that you can enjoy the comfort of cool air quickly and easily.

Tools Needed:

Before you get started, make sure you have the necessary tools to install your AC. You will need a power drill and drill bit, metal screws, angle brackets, and measuring tape. You may also want to purchase an adjustable window installation kit specifically designed for casement windows.

Step 1: Choose the Right Type of Air Conditioner

Before installing your air conditioner, be sure that you have chosen the right type for your needs. The two most common types are window-mounted, or split system units. Window-Mounted units come in one piece and can easily fit into any standard-sized window without having to do any additional work.

Split system units require more installation work as they have outdoor and indoor components that must be linked together.

Step 2: Prep the Window

Now that you have chosen your air conditioning unit, it’s time to prepare the window for installation. Make sure that the window is securely locked and check for any signs of damage such as cracks or rot. If there are any issues, you may need to repair them before proceeding with the installation process.

Also, measure the inside dimensions of your window so that you can select an appropriately sized AC unit.

Types Of Casement Windows:

1. Awning Casement Window: This type of casement window has a hinge at the top and opens outward from the bottom. This makes them ideal for mounting AC units since they provide plenty of space to work with.

2. Hopper Casement Window: This is the most common type of casement window, featuring a hinge at the bottom and opening inward. While this may make it difficult to install an AC unit in some cases, it can be done if you have enough space inside your home.

3. Push-Out Casement Windows: These windows are similar to awning casement windows except that they open outwards instead of inwards. Installing an air conditioning unit on pushout windows is fairly straightforward since there is plenty of room outside the window to work with.

Step 3: Install the Air Conditioner

Once your window is prepped and ready, install your air conditioner according to the manufacturer’s instructions. For a split system unit, be sure to connect all components correctly and secure everything in place with screws or bolts.

When properly installed, the condenser should be located outside the window and the evaporator coil inside.

How To Install an Air Conditioner?

The first step in installing an air conditioner is to connect the power supply. Depending on your unit, this may involve either plugging it into a standard electrical outlet or hardwiring it into your home’s existing electrical system. Once connected, you can turn the unit on and make sure that all of its settings are correctly adjusted.

Once the power source has been confirmed, you will need to install any additional components such as insulation or ductwork.

This may involve cutting pieces of material to fit specific measurements and then connecting them using screws, nails, or other fastening methods. It is important that all connections are tight and secure so that no air leaks out before it reaches its destination.

Once all of these components are in place, it is time to mount the air conditioner. This will involve either mounting the unit directly on a wall or suspending it from an appropriate bracket.

Once mounted, you can make sure that all of its settings are correctly adjusted and then turn on the power source.

Finally, you can now start to enjoy the cool air your new air conditioning system provides! Make sure that you regularly check for leaks and other issues so that your air conditioning system remains efficient and effective over its lifetime.

With proper installation and maintenance, you should be able to enjoy comfortable temperatures for years to come.

Step 4: Create a Weather Seal

To make sure your AC runs efficiently and doesn’t result in increased energy bills, you’ll need to create an effective weather seal around the unit. Depending on your type of window, you can use caulk or foam insulation to fill any gaps between the frame and the AC unit.

This will keep out hot air from outside while trapping cool air inside for maximum efficiency.

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Safety Measures:

To ensure safe AC installation in a casement window, keep the following safety measures in mind:

1. Make sure you have the right tools and supplies to perform the job correctly.

2. Wear protective gear such as gloves, glasses, and masks while handling power tools or sharp objects.

3. Ensure that all electrical components are disconnected from power sources before beginning installation.

4. Read manufacturer instructions carefully when installing the condenser and evaporator coils separately.

5. Support heavier parts of the unit with brackets or straps for additional stability during installation.

6. Don’t cut corners—make sure every part is securely mounted into place for optimal performance and safety purposes.

7. Use a level to help ensure that the unit is balanced and level during installation.


Installing an air conditioner in a casement window is not as challenging as it may seem when you have all the right tools and materials. With these four steps, you can successfully install an AC unit in your casement window and enjoy the cool air for many years to come.


Q: What size of AC unit should I buy for a casement window?

The best way to determine the right size of AC is by measuring the dimensions of your window and then looking at what type of units are available that will fit those dimensions. Make sure you take into account any additional space needed for installation, such as room for weather-sealing materials.

Q: How often should I clean my casement window AC unit?

To ensure peak efficiency and protect against dirt, dust, and other debris build-up, it’s recommended to clean your AC unit at least once a year, or more often if you live in an area of high pollution or dirt. Additionally, make sure to check the filter on your unit regularly so it can trap airborne particles and keep the air inside your home clean and healthy.

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