Does it fit any window air conditioner?

It is a foam panel meant to be trimmed, so it adapts to many window openings. Very large units may need two panels or extra weatherstripping.

Can I leave the AC installed and use this?

Yes. It is designed to seal around a unit that stays in the window through the cold season.

It blocks most of the airflow through the unit, but small edge gaps can remain. Adding weatherstripping helps.

It dampens some outside noise and vibration, but it is not a soundproofing product.

Foam can compress and tear over time. Many owners replace it after a few winters.

The foam cover panel. Tape or weatherstripping for the edges is not included.

14 stores we checked sell it, including Zoro, Walmart, Fleet Farm, Collections Etc., Miles Kimball.

At Zoro, for $15.89, 16% under what the other stores charge, as of our latest check.

$15.89at ZoroChecked 1 h ago

16% under what the other stores charge

Compared across 14 stores. Prices are checked against each store and labelled with when.

It checks today's price at every store, compares the alternatives and answers in about a minute.