How To Properly Seal A Window Ac Unit

Then fold down the house wrap at the top and cover the diagonal slits at the top with house wrap tape.

How to properly seal a window ac unit.

Before installing a window ac open the window as far as it goes remove the screen and clean the windowsill glass and window frame. Measure the width of the windowsill and use a pencil to mark. Most window air conditioners come with an accordion style flap attached to the sides to fill the open space. Open the window where the portable air conditioner will be located.

Step 3 examine the sash. Cut foam weather stripping to length and attach to the window sash and frame. To fix this purchase some air conditioner foam seal at your local hardware store if there isn t any with your unit. Lower the window sash until it rests on top of the vent panel.

Re close the window tightly. Seal around the window with flashing tape lapping the top piece over the sides. Narrow or hard to reach gaps measure the length of gaps that are 1 8 inch thick or smaller. Smooth the caulk and wipe away.

Press the caulk into the gap. 2 position the end of the weatherstripping at one end. Then lift the window and place the seal under the lip of the window. Ask a helper to hold the air conditioner unit in place while you raise the bottom window sash up enough so that you can access the bottom edge.

Flashing tape is the first line of defense.