Another added benefit to an air duct cleaning is that it saves you money. According to the U.S. Department of Energy, 25 to 40 percent of the energy used for heating or cooling a home is wasted. Contaminants in the heating and cooling system cause it to work harder and shorten the life of your system. Although filters are used, the heating and cooling system still gets dirty through normal use. Purify Air Duct Cleaning will sanitize your duct system.