Abstract: A program for encouraging homebuyers to purchase more efficient HVAC equipment at the time they purchase an existing house is described. The purchase price of the HVAC equipment is included in the mortgage loan. The overall monthly cost of the mortgage payment and heating and cooling costs is lowered for any given house. The program is marketed through a real estate agent working closely with a HVAC supplier. A central control entity may oversee the process, provide standardized forms, and locate appropriate installers.