How tight is your home? Without testing, there’s no way to know for sure. A blower door test is a diagnostic procedure that measures your home’s airtightness by using a calibrated fan temporarily mounted in an exterior doorframe. The fan depressurizes the house, and our technicians use the airflow data to calculate exactly how much air is leaking in and out of your home.

At 1st Choice Insulation, we use blower door testing to pinpoint hidden air leaks before and after insulation and air sealing work. This allows us to target the areas that matter most — like rim joists, attic penetrations, and ductwork chases — and verify that our work is making a measurable difference. It’s not guesswork; it’s science-backed performance testing that puts real numbers behind your home’s energy efficiency.

Find Hidden Leaks

Air leaks aren’t always obvious. They hide behind walls, in attic floors, around plumbing and electrical penetrations, and along rim joists in the basement or crawl space. A blower door test reveals these invisible problem areas so they can be properly sealed — something a visual inspection alone simply can’t do.

Measure Real Results

We don’t just seal your home and call it a day. By performing a blower door test before and after air sealing or insulation work, we can show you the actual improvement in your home’s airtightness. This before-and-after data gives you confidence that the investment you’ve made is delivering real, measurable energy savings.

Protect Your HVAC

When your home is leaking air, your furnace and air conditioner have to run harder and longer to keep up. That constant cycling drives up your energy bills and puts unnecessary strain on your equipment — leading to more frequent repairs and a shorter lifespan. A blower door test helps us identify and eliminate the leaks that are forcing your system to overwork, so it runs less, lasts longer, and keeps your home comfortable with less effort.