"Duct leakage is leakage. I always apply the 6 cfm per 100 sqft energy star leakage standard for the ducts that I work with. The main difference in heating and cooling is in expected air flow of the two system types which vary."
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Residential Energy+ is a Rocky Mountain Institute (RMI) initiative enabling industry actors to capture the $150 billion residential energy upgrades market opportunity, and meet the top unmet demand among homeowners: improved home energy performance.