At PCBC last week my blog sponsor introduced a proprietary duct energy efficiency calculator that allows builders to quantify the amount of money consumers can save on annual energy costs by using fiberglass duct solutions in their HVAC system. Recent studies conducted by North American Insulation Manufacturers Association have shown that rigid fiberglass duct systems can save up to four times more energy than bare sheet metal without sealed joints, and 1.2 times more than sealed and lined sheet metal. The Owens Corning Duct System Energy Efficiency Calculator helps builders pass significant energy efficiency savings onto their homeowner customers.