Window Air Conditioner Installation

Some customers have asked how to install a window air conditioner. Installation is relatively straight forward as long as you have a suitable window opening that the AC unit will fit into.

Let's start with the first steps that you should go through to get started.

Take Measurements of the Room

window air conditioner installationThere are many sizes and cooling capacities available for window air conditioners. It is important that you choose the one that suits your room best.

First, measure the space that needs to be cooled by your window AC unit. This will help you determine the area that the unit will need to heat or cool.

You can adjust the unit's capacity (kW) to compensate for unusually warm or cold rooms or to run the unit at different times of the day or during the hot season.

The size of the doors to other rooms and the number of people in a room can also impact the efficiency of your air conditioner. These are just a few of the factors to consider before purchasing a unit.

After considering all factors, you can determine the size of your air conditioner. The fun part is now: buying a window unit air conditioner unit and any accessories you may need.

Select a Suitable Window

Once you have determined the size of the room and the AC size required, identify the actual window in the room where the unit will be installed.

To ensure that the unit fits, measure the width and height of your opening. Before buying a box unit, it is wise to measure the available space.

You don't have to worry if the opening is too big. Many window AC units include an accordion-shaped panel that can fill in the gaps.

If your window is too small, you will need to either buy a smaller unit or install a larger unit through the wall.

Window air conditioners are available in two types: one for double-sash windows, and one for casement windows. You will need to ensure that you purchase the right unit for your circumstances.

There are also different sizes with varying power outputs that you'll need to be aware of when sizing your room. You will also find different units that come with a certain functions, such as the type of self-evaporating portable ACs that eliminate most or all of the condensate that builds up and drains out of regular units.

Check Your Window

Many units can be fitted to different types of windows. Safety is the most important consideration when choosing a suitable site in which to install your air conditioner.

It is a good idea to first fix any problems you may have with your windowsill and frame, such as replacing any old, soft or rotten wood with fresh, new wood. After everything is in place, you can install the window conditioner.

Put the Window AC Unit in Place

Now it is time to install the window air conditioning unit. Remove all components from the box, and assemble the unit according to the instructions.

Window air conditioners usually require that you add additional components such as flanges or accordion-style panel.

Use your screwdriver to insert the screws if they are included in your package. You will need to buy them separately if your package does not include screws.

Window ACs can be very heavy so you may need to have a friend or family member help you with this step.

You will need to open the glass pane in which you plan to install the unit. Run waterproof tape along the windowsill if your air conditioner comes with it.

These strips can be used as an optional protection for your unit during installation or removal. They prevent cold air from escaping.

Your friend can help you lift the air conditioner and place it on the bottom of your window frame. As your friend holds the unit in place, move on to the next step.

Adjust the Window Frame

Make any adjustments necessary to the frame so that it is in line with the top flange.

Make sure the bottom flange is in line with the windowsill.

Install the Brackets

A set of angled brackets should be included with your unit. These brackets are crucial as they secure your window frames and prevent the unit's fall.

Place one bracket on each side to attach the air conditioner to the frame.

The angle brackets will fit in the frame's slot, and the other will be placed on top of it. These brackets can be installed using a screwdriver or the purchased screws.

If the wood is too dense, you might need to drill a hole in the ground and then tighten the screws.

Seal the Window Gap

Last, you will need to seal the space between the lower and upper frames.

This can be done with insulating foam strips or other material, that should be included in your window conditioner kit.

If it does not, you can purchase an insulating strip separately or have a custom strip made at a hardware store.

Place the strip between the windowsill at the bottom and the top of the frame. You can trim the excess length of the strip with a utility knife. After the foam strip has been tightened, it is time to set up your AC for use.

This will include connecting the electricity supply to a suitable mains power outlet. This is generally a simple plug that connects to a nearby wall socket.

Set the controls for the temperature you desire and the fan speed etc and you're ready to go.


Once you have plugged it in and turned it on, you should start to feel the cool air being blasted out of the unit into the room.

After a while, the room's temperature will drop to a comfortable level and when the thermostat's setting is reached the unit will cycle on and off to maintain that temperature.

Congratulations, you have installed your window air conditioner and can now enjoy it's cooling effect on those hot summer days!