A home energy rater will conduct an in-depth energy performance assessment of a home using diagnostic testing equipment, such as a blower door test, a duct leakage tester, a combustion analyzer, and infrared camera to determine the amount and location of air leaks in the building envelope, the amount of leakage from HVAC distribution ducts, the effectiveness of insulation inside the walls and ceilings, and any existing or potential combustion safety issues.