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Infiltration Testing of Homes in the Houston Gulf Coast Area
Air Changes per Hour (ACH) are determined by construction and weather conditions. In this test, it was found that the ACH is equal to .59 plus .07 for every year of age the home has. The higher ACH values for age are due to deterioration and construction techniques. The American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE) has a methodology for determining' ACH based on component leakage areas. The results found using this method are close to the results found in testing new home construction. Weatherization and retrofitting can decrease the ACH in an older home, however, a significant decrease would generally require significant retrofitting and expense.
Howel, E. S. (1990). Infiltration Testing of Homes in the Houston Gulf Coast Area. Energy Systems Laboratory (http://esl.tamu.edu); Texas A&M University (http://www.tamu.edu). Available electronically from