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I used that silver reflective bubble wrap to block out sun on my 2nd floor to help cool my house... done as an experiment. Holy Moly it made a huge difference. It was colder on my 2nd floor than on the first floor by about 10 degrees. That's proof in the pudding. At first my wife hated it, but then it grew on her once she really experienced the positive effects for a while. I then put that in the 1st floor windows as well the following Summer. Incredible how much less often my AC was running and how cool the house was. Now my tree on the West side is getting larger and helping as well.
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