 |
  
  |
|
Diagnostic Tests Blower door Test
The blower door is a powerful fan that is mounted into the frame of an exterior door. The fan pulls air out of the house, lowering the air pressure inside. The higher outside air pressure then flows in through all unsealed cracks and openings. Since leakier houses require more airflow to induce a given pressure difference, blower doors can measure the relative leakiness of a house. HERS Raters use the blower door test to detect air leaks in the home. They may also use a smoke pencil to detect air leaks. These tests determine the air infiltration rate of a building. Duct Blaster Test
Thermal Bypass Inspection In response to significant changes in residential energy codes and new standards, the United States Environmental Protection Agency (EPA) released a new set of guidelines for ENERGY STAR qualified homes permitted on or after July 1, 2006. A major new requirement is the Thermal Bypass Inspection Checklist (TBIC). The TBIC is a 16 point list of building details where thermal bypass, or movement of heat around or through insulation, frequently occurs due to missing air barriers or gaps between the air barrier and insulation. The TBIC requires a visual inspection of framing areas where air barriers are commonly missed and inspection of insulation to ensure proper alignment with air barriers, thus serving as an extra check that the air and thermal barriers are continuous and complete. HERS raters use their experience and discretion in verifying that each TBIC item is installed per the inspection guidelines. Reducing thermal bypasses is important as they can lead to comfort and warranty issues as well as higher utility bills. Click here for more information about the TBIC.
|
|
Diagnostic testing can reveal many hidden air leaks around a home. These leaks result in an energy inefficient home. After a new home has been dry-walled, the HERS Rater will perform the blower door test to detect and seal those air leaks. 
A duct blaster test measures the leakiness of the ductwork. Ten to 30 percent of a typical home's heating and cooling bill can be attributed to duct leakage. If not sealed properly, heating and cooling ducts lose conditioned air and return ducts pull in unhealthy air from attics and crawlspaces. Unhealthy air contributes to medical problems and introduces unwanted dust and pollen into your home. Results from the duct blaster test contribute to a home’s HERS Index. 
