How To Properly Seal A Window Ac Unit

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.

How to properly seal a window ac unit. Press the caulk into the gap. 2 position the end of the weatherstripping at one end. Narrow or hard to reach gaps measure the length of gaps that are 1 8 inch thick or smaller. Tear off a length of rope caulk to match.

Most window air conditioners come with an accordion style flap attached to the sides to fill the open space. Cut foam weather stripping to length and attach to the window sash and frame. Then fold down the house wrap at the top and cover the diagonal slits at the top with house wrap tape. Smooth the caulk and wipe away.

Before installing a window ac open the window as far as it goes remove the screen and clean the windowsill glass and window frame. Lower the window sash until it rests on top of the vent panel. Open the window where the portable air conditioner will be located. To fix this purchase some air conditioner foam seal at your local hardware store if there isn t any with your unit.

Flashing tape is the first line of defense. If the gap is deep you may need to press two pieces into the gap to fill it completely. Seal around the window with flashing tape lapping the top piece over the sides. Measure the width of the windowsill and use a pencil to mark.

Re close the window tightly.