What are the trade-offs regarding home roofing reflectance. I ask because I'm considering using a 40% R roof for most of my home (mostly for asthetic reasons) and a 60% R for a south facing (and not ground visible) large dormer we have -- mainly to reduce heat load in the summer which has been a problem.
Is there a down side to this. Some people seem to want to use darker roofs so the snow melts faster -- others say it's good for snow not to melt and a cooler roof is better in both the winter and summer.
I live in minnesota -- so we get both very cold and quite warm -- but only a moderate amount of snow usually.
Thoughts?
Rob