Why don't houses have double glazed glass roofs?
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@rose_myrtle Like a greenhouse? Skylights do. Roofs have to have a minimum of R-49 for insulation here. The best glass might get you R-2, so it would get very hot or cold.
Wow. Yeah, that's a good reason!
@daniel @rose_myrtle I love it when random people on the internet actually give good knowledgeable answers. It happens so rarely it's like a special surprise every time.