M-D Building Products 8308 Air Conditioner Side Panel Kit, Gray

• All season protection against drafts, moisture, dust and insects
• Self adhesive installation strips included
• Open cell polyurethane foam
• Fasteners included
• 9 inches by 18 inches by 7/8-inch thick

When the accordian side panels to my five year old window unit finally bit the dust...I figured it was time to replace them with something besides a bunch of old towels and some cardboard.

These window panels are easy to trim...and will fit in the existing extenders if your air conditioner has them. If you don't...you can use the supplied sticky channel. My husband and I had them installed in 15 minutes...and noticed quite a difference in the coolness of the room....and they're a lot better looking than towels and cardboard.

Since they're foam...and compress...if your window is as uneven as mine is...it actually works better than the original plastic side panels. If you think industrial grey is ugly...you can cut some paper or cardboard to fit in front of the foam in the channel.

I recommend locking your window sash when using these...both to avoid having your air conditioner fall out your window...and discourage someone from using your air conditioner unit as a handy way to get in your house. (They don't screw in like the accordian panels do.) You can buy a simple "L" bracket at the hardware store to secure the sash.

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These side panels are pretty self-explanatory. Two pieces of dense grey foam. Cut them to size, and voila! No more losing that precious cool air to the evil outdoors.

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I use this panels over my existing panels, which came with the AC, for extra insulation.

The panels are easy to trim/cut and easy to put in place. I didn't even use the self adhesive installation strips, I just squeezed it between window frame and AC and it holds perfectly (goes back to its former shape after you squeezed it).

Does the job: Keeps HEAT out and COOL AIR in.

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I don't understand how these are supposed to replace existing plastic accordian side panels. The foam has no protective covering. Won't the elements (particularly rain and snow) ruin them? I didn't want to risk it. I used these to cover the existing panels, securing them on all sides with duct tape (otherwise, the air still leaks around). Not the prettiest solution but it works. I immediately noticed a big difference from the added insulation.

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Very easy to cut and fit into window. Previous types required exact measurements before they could be sent to you and then you had to hope you measured right. Not so with these. Work really well at sealing the opening.