A heavy-duty tape designed to withstand temperature changes without leaving sticky residue.

Tom started by cleaning the area around the AC unit, removing any debris or old caulk that might be obstructing the sealing process. He then measured the gap between the AC unit and the window frame, realizing it was about an inch wide.

Before you start, decide on your method. The "Best" method uses foam weatherstripping and tape, while the "Easiest" method uses a specialized cover.