I didn't measure the temperature before/after so you must consider other reviews on the subject. But installation with an electric stapler took less than 10 minutes. It was a little larger than the actual room but we made sure to secure the end with a zip that you zip through first, it fits perfectly. Both sides done, then the back. I had to add a few small pleats to make up for the extra material, but it worked out just fine. The zipper seems to slide well, only needs to be moved slowly when it curves into the corners, but I'm happy with how it works. Again so easy to install and overall very satisfied.
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