How to install an air conditioner into a window

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If you're trying to figure out how to install an air conditioner, you're not alone. A perfectly installed home cooling system can help you keep you cool and comfortable during the hottest months.

If you're lucky enough to have a central air conditioner, you've most likely had it installed by a contractor. If you're learning how to install an air conditioner yourself, you'll be happy to know that it's a fairly simple process if you have a helping hand.

Step 1: Check location

The first step is to make sure that the window is perfectly sound. Check for any rotting edges or nicks and dents. The air conditioner needs to be placed into a safe and firm window frame.

If you have a choice of windows, choose the window that gets the least amount of afternoon sun. Air conditioners that are placed in windows that get intense sun have to work harder to cool your space.

You'll also want to make sure that the window is near an outlet so you can plug the unit in without using an extension cord.

Step 2: Mount 'em brackets

The next step is to install the unit's mounting brackets, if included. Brackets usually come with air conditioners that are either very heavy or very old and are attached to the window frame using sheet metal screws for a metal window frame or wood screws for a vinyl or wood frame.

Use a level to make sure that the brackets are even.

Talk to a contractor and request free AC quotes!

Step 3: Insert AC

Next, pull the accordion panels open and place the air conditioning unit in the window or frame. If you have a built-in frame, open the window wide enough to slide in the unit.

Slide the window back down and push the accordion panels back against the sides of the AC so that they hold it in place. Some units are designed to tilt to allow for drainage, so check your manual to see if yours is a tilting model.

Step 4: Don't forget the frame

Complete the installation by screwing the mounting frame to the window.

Some units include angle brackets. If included, attach them to the window's upper sash with screws.

If your unit doesn't include the brackets you can buy them at a hardware store. Fill in the gap between the lower sash and the window with weatherstripping.

Before you begin to install air conditioner units in your home, make sure that you get the right units for the spaces where they will be installed. Also choose units with good warranties.

If you'd rather have someone do all of the work for you, contact a contractor and get an air conditioner estimate that includes installation. Check out Reply! for more information about HVAC systems, air conditioner prices, choosing an air conditioner, and installing it properly. Once you know how to install an air conditioner, you'll be set for summer.