Sorry, the web browser you're using is not supported by this website.

Please use Google Chrome, Firefox, Safari, or another browser to access homex.com. Thank you.

Skip to main content

We use cookies to enhance your experience. For details on how we use cookies, collect data, & how to manage your consent please see our Cookie Policy & Privacy Policy.

How do you soundproof a window air conditioner?

To fill the gap between the upper window insert and the a/c unit, place insulation on either side of the air conditioner. If you don't want to install a mullion, you can use L brackets to keep the upper window insert in place.

Let's Get It Fixed!

Our virtual experts can diagnose your issue (for free!) and resolve simple problems.

What Did You Think of This Article?

What Did You Think of This Article?

Shop Recommended ProductsShop HomeX Recommended Products