I have an R70 rating for my attic now. Which is well above average for most houses.
I made it R70 after finding the builder had put R30 (code) for most of the house but had failed to put any insulation over one bedroom.
Both before and after the lighter roof made a difference about turning the A/C on versus neighbors.
I've had white shingles for 8 years now -- chosen for this very reason. I turn on the A/C about 1/3 of the time my neighbors do (with black shingles). Saved me a lotta money:-) It's worth it long term on an individual basis and an environmental basis. When you can get both to coincide then it must be right!
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I have an R70 rating for my attic now. Which is well above average for most houses. I made it R70 after finding the builder had put R30 (code) for most of the house but had failed to put any insulation over one bedroom. Both before and after the lighter roof made a difference about turning the A/C on versus neighbors.
I've had white shingles for 8 years now -- chosen for this very reason. I turn on the A/C about 1/3 of the time my neighbors do (with black shingles). Saved me a lotta money :-) It's worth it long term on an individual basis and an environmental basis. When you can get both to coincide then it must be right!