How To Seal Off A Window Unit

Cut off the tip of the caulk tube with the built in cutter on the caulk gun.

How to seal off a window unit.

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. To fix this purchase some air conditioner foam seal at your local hardware store if there isn t any with your unit. To prevent leaks caulk the window where it meets the exterior siding.

If you don t feel like removing a whole ac unit and sealing off the window the other good option is to seal a window air conditioner for the winter. If the gap is deep you may need to press two pieces into the gap to fill it completely. The cause is a failure in the edge seal that secures the individual panes of glass. The symptoms of failed window seals are easy to spot.

Narrow or hard to reach gaps measure the length of gaps that are 1 8 inch thick or smaller. Then lift the window and place the seal under the lip of the window. Diy expert josh temple shows how to take out an unwanted window and make the space part of the wall instead. Re close the window tightly.

This means both covering the outside body of the ac unit with a plastic bag to weatherize it and then covering it with a heavy fabric cover to protect it from the elements. Wrap the opening with a moisture barrier and seal the seams against weather with flashing. Press the caulk into the gap. If the window is surrounded by wood trim use a high grade polyurethane caulk to seal all gaps between the trim and the siding and the trim and the window.

Next frame the opening with 2 x4 boards. Skin the outer opening with a piece of material cut to the exact size of the hole. Start by removing the window. Smooth the caulk and wipe away.

Insert the tube of caulk tip first into. Take special care to seal the top side of the top piece of trim.