How To Properly Seal A Window Ac Unit

Adjust the ac unit s window vent panel to extend across the width of the opening.

How to properly seal a window ac unit. Measure the width of the windowsill and use a pencil to mark. 2 position the end of the weatherstripping at one end. Most window air conditioners come with an accordion style flap attached to the sides to fill the open space. Smooth the caulk and wipe away.

To fix this purchase some air conditioner foam seal at your local hardware store if there isn t any with your unit. Then fold down the house wrap at the top and cover the diagonal slits at the top with house wrap tape. 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. Then lift the window and place the seal under the lip of the window.

If the gap is deep you may need to press two pieces into the gap to fill it completely. Before installing a window ac open the window as far as it goes remove the screen and clean the windowsill glass and window frame. Press the caulk into the gap. Step 3 examine the sash.

Seal around the window with flashing tape lapping the top piece over the sides. Cut foam weather stripping to length and attach to the window sash and frame. Re close the window tightly. Open the window where the portable air conditioner will be located.

Tear off a length of rope caulk to match.