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How Does a Blower Door Test Work? A blower door test uses a machine (called the blower door) to verify the airtightness of new and existing homes. The equipment is comprised of an adjustable metal frame with a canvas shroud that’s meant to be fitted within the opening of an exterior door. A round fan…

What is the Home Energy Rating System (HERS) Index? The Home Energy Rating System (HERS) Index is the home building industry standard by which a home’s energy efficiency is measured. It’s a nationally recognized system for inspecting and calculating a home’s projected energy use. What is a good energy rating for a house? When it comes to HERS…