I am debating on replacing my current roof with either shingles or metalI am wondering what would be the best option in terms of resale value and durabilityWhat are your opinions on each? Also, and some what more importantly, is a ridge vent necessary with a metal roof as it is with a shingled roofMy house was built in 1993 and it wasn't common to install ridge vents during that periodMy metal roofing contractor has told me that they don't typically install them if they are not there already because the metal reflects heat rather than absorb it like shinglesThe house has gable vents on each sideIs it a big deal and should it be done? Our electricity bill is very reasonable and I don't want to do anything to make it worse while trying to make it betterI am afraid that I may have to much heat lost during the winterAny thoughts? Thanks!!!!