
First I ordered two different brands of these double insulated gray air conditioner covers to compare and they were virtually identical. Even the picture on the packaging was identical. So I recommend buying the cheapest you see as many brands seem to offer just that. My window air conditioner is 23.5 x 15 inches so I chose 25 x 17. It fits great with very little sagging. It also looks neat and tidy and doesn't irritate the eyes, which bothered me. It only took 30 seconds to install and the elastic is good and strong. I immediately noticed that there were fewer drafts. Before that I just closed the blinds and covered them with a curtain. But I should have done it earlier, I really think it will make a big difference this winter.

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