An unventilated attic can reach 150 degrees in the heat of summer -- 50 degrees higher than it should be. An overheated attic can bake asphalt shingles on the roof and cause them to deteriorate. And it can cause your air conditioner to work harder than it needs to and send your energy bills soaring with the temperature. To head off these problems, consider these options for bringing your attic's temperature down: Install electric ventilators and attic fans, which remove hot a