If a cool metal roof is reflecting heat away from the house, will more energy be required to heat my home in the winter?
No, because the amount of heat an attic beneath, say, an asphalt-shingled roof would gain during the winter is comparable to a metal roof. And, because warmth wants to move toward cold air, the challenge remains the same as it is for any home: how to keep the heated air inside the house from escaping through the attic, doors, windows, etc. A metal roof is no colder than the ambient outdoor air, so it’s not working to draw warmth out of the home. If your attic is insulated to the proper R-value, you shouldn’t notice any appreciable difference in your heating bills.
