What is a Blower Door Test?

A blower door test uses a powerful, calibrated fan that is temporarily mounted to an exterior door frame. When the fan runs, it pulls air out of the house, lowering the inside pressure. This causes outside air to flow in through cracks, gaps, and hidden leaks. With specialized gauges, we can measure exactly how “leaky” or “tight” your home is.

This test helps us identify where conditioned air is escaping and where unwanted outdoor air is sneaking in. The results give you a clear picture of your home’s energy efficiency and comfort level.

Why Should You Get a Blower Door Test?

• Lower Energy Bills – Air leaks force your HVAC system to work harder. Sealing them means your system runs more efficiently.

• Improve Comfort – Say goodbye to drafty rooms, hot or cold spots, and uneven temperatures.

• Enhance Indoor Air Quality – Leaks can pull in dust, pollen, and attic or crawlspace air. A tighter home helps protect your family’s health.

• Meet Building Codes & Rebates – Many energy efficiency programs and local codes require blower door testing for new builds or renovations.

• Protect Your Investment – By pinpointing air leaks, you reduce unnecessary strain on your HVAC equipment, helping it last longer.

Who is a Good Candidate for Blower Door Testing?

• Homeowners noticing drafts, high bills, or uneven temperatures

• Anyone planning a major HVAC upgrade or duct replacement (ensures your new system isn’t fighting against air leaks)

• New construction or remodeled homes that need to pass code or qualify for energy rebates

• Homeowners preparing to sell who want to highlight efficiency improvements to potential buyers

Why Choose DNA Heating & Cooling?

We use industry-leading equipment and combine the test results with our HVAC expertise to give you practical, actionable solutions. Our goal is not just to run the test—it’s to help you create a more comfortable, energy-efficient, and healthy home environment.