Re close the window tightly.
How to properly seal a window ac unit.
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.
Smooth the caulk and wipe away.
Most window air conditioners come with an accordion style flap attached to the sides to fill the open space.
Press the caulk into the gap.
Then lift the window and place the seal under the lip of the window.
Cut foam weather stripping to length and attach to the window sash and frame.
Measure the width of the windowsill and use a pencil to mark.
Open the window where the portable air conditioner will be located.
Adjust the ac unit s window vent panel to extend across the width of the opening.
Then fold down the house wrap at the top and cover the diagonal slits at the top with house wrap tape.
To fix this purchase some air conditioner foam seal at your local hardware store if there isn t any with your unit.
Seal around the window with flashing tape lapping the top piece over the sides.
Step 3 examine the sash.
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.
Lower the window sash until it rests on top of the vent panel.
2 position the end of the weatherstripping at one end.