How To Properly Seal A Window Ac Unit

Measure the width of the windowsill and use a pencil to mark.

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. To fix this purchase some air conditioner foam seal at your local hardware store if there isn t any with your unit. Step 3 examine the sash. Most window air conditioners come with an accordion style flap attached to the sides to fill the open space.

Re close the window tightly. Then fold down the house wrap at the top and cover the diagonal slits at the top with house wrap tape. Narrow or hard to reach gaps measure the length of gaps that are 1 8 inch thick or smaller. If the gap is deep you may need to press two pieces into the gap to fill it completely.

Flashing tape is the first line of defense. Before installing a window ac open the window as far as it goes remove the screen and clean the windowsill glass and window frame. Tear off a length of rope caulk to match. Smooth the caulk and wipe away.

Adjust the ac unit s window vent panel to extend across the width of the opening. Then lift the window and place the seal under the lip of the window. Open the window where the portable air conditioner will be located. Press the caulk into the gap.

Cut foam weather stripping to length and attach to the window sash and frame.