New 'smart' roof reads the thermometer, saves energy in hot and cold climates
Monday, March 22, 2010 - 05:14
in Earth & Climate
Top a building with a light-colored "cool roof," and it reflects sunlight, cutting air conditioning bills in summer, but increasing winter heating costs. Choose black shingles, and the roof soaks up sunlight to cut winter heating costs but makes the roof bake in the summer sun. One or the other. You can't have it both ways. Until now.