How To Install A Window AC Unit

Use our simple DIY guide below to properly install a window AC unit.

Step 1. Prepare Window And AC Unit

Make sure your window is sound and sturdy long before attempting any installations. The window needs to be strong enough to support the weight of the AC unit. Any repairs should be made ahead of time if you notice any damage or rot around the area.

A support bracket can be utilized to transfer some of the weight of the AC off the window sill and sash. Support brackets will ultimately minimize the chance of damage to the window and surrounding area.

Follow these steps:

• Begin by opening the lower window sash.
• Attach the bracket by using the hardware provided.
• Slide accordion panels onto both sides of the air conditioning unit.
• Make sure you have a helper nearby, as AC units are quite heavy.
• Place the unit gently inside the open window.
• Rest the AC on the bottom of the window frame and mounting support bracket.
• Center the AC in the window opening.
• Now position the system’s bottom flange or guide right against the window stool.

Step 2. Place And Secure AC Unit

Again, make sure you have at least one person there to help you balance the heavy unit in the window.

Follow these steps:

• Set the unit on the window frame.
• Pull the upper window sash down to the top of the box, behind the upper flange.
• Use your screws to attach the flange guide or cabinet to the window sash and stool of the unit.
• Next, attach an L-shaped window locking bracket to the upper window sash with the screws.
• This will prevent the lower sash from opening accidentally.
• Make a pilot hole for the screw with a power drill.
• Use a screwdriver to tighten the bracket.

Step 3. Fasten Side Panels

When the air condition is secure, you’ll want to keep the warm air outside and cool air inside.

• Extend the accordion panels from both sides of the unit to the window sash track.
• Use screws to secure the side panels.
• Cut the window’s foam insulating strip to the correct length.
• Insert this between the upper window sash and lower window sash.
• Plug the air conditioner into an outlet and turn the unit on.
• Now read over the manufacturer’s instructions to make sure everything has been completed.