Tips For Installing A Window AC

26 May 2016
 Categories: , Blog


A window air conditioning unit may seem like a quick and easy way to get air conditioning in your home without the need for existing ductwork. While this can be true, it is vital that you understand what is required to install your new AC unit safely. The following tips can help you with the entire process.

Tip #1: Measure carefully

While it's common knowledge that you need to choose a unit that is sized to the room, you also need to make sure it will fit in your window safely. Before shopping, measure the dimensions of your open window. It isn't uncommon to find that although your window is wide enough, the sash doesn't lift enough to allow easy installation. By measuring first you can be sure that the unit will fit in the space you have.

Tip #2: Choose the right window

Not just any window will do, either. You don't want the sun beating down on the AC unit – that will just cause it to overwork. Opt for a window that is on the north side of the house or that is shaded by nearby trees or buildings. If this isn't possible, consider having an awning installed over the window to provide some shade and protection.

Tip #3: Consider potential hazards

Few windows are made perfectly for the unit. Begin by checking the sill and window frame for rot, and repairing any issues you find. Next, look for anything that could be an issue during installation. If your sill, for example, sits well below the window frame, you may need to screw a board onto the sill to make it level with the frame. Many windows have insufficient sills for supporting the AC, as well. This means you will need to invest in an AC unit shelf and install it on the outside of the house so it can properly support the unit.

Tip #4: Keep it safe

The accordion panels at the sides of the unit should be opened to fill in any remaining gap and then screwed into place so they don't come loose. These help anchor the unit in the opening. You also need to make sure the window can't be accidentally opened when the unit is in place. The easiest way to do this is to install brackets between the frame and the top of the sash. You can remove these brackets when it's time to remove the unit. Finally, if you must use an extension cord, make sure it is one rated for use with AC units.

For more help, contact an HVAC contractor in your area or visit a site like They can help you install a window AC properly.