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