If you use iko or bp shingles doesn't matter if you put them on in the summer. They are garbage shingles and hardly stick. Have done countless repairs on these types of shingles only because they don't stick properly and blow off in moderate winds. I used to work for my dad's roofing company (primo roofing) and he uses nothing but GAF and wont touch anything else. GAF offers lifetime warranty on their shingles if put on by a certified GAF installer which they only certify certain companies to be installers for them because of quality control. And the cold thing is hocus, it's about the quality of the shingle. We roof all year round and the only complaints we get if any are contractors leaving the job site without doing a proper cleanup around the yard.
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