During pre-construction, GGC performed an energy test to determine existing conditions. The tests included a blower door test for air leakage in the walls, doors, windows and ceiling as well as a duct blaster test of the efficiency of the HVAC ducts. GGC also performed a combustion safety test on all the combustion appliances, for example, the gas oven, dryer, etc. Employing a model derived from the Energy Pro program, GGC was able to compare the home’s existing conditions and a proposed condition model. The proposed energy savings came out to 45%.