HouseChalk
Blower door test
A blower door test uses a powerful fan mounted in a doorway to measure how much air leaks in and out of a home.
Why it matters
It reveals how tight or leaky a house is. Results help prioritize air sealing work and verify improvements.
Where people get this wrong
A blower door test does not fix anything. It diagnoses the problem. The test result is a number that compares to targets for the home size.
Real-world example
A blower door test shows the home is very leaky. With the fan running, you can feel cold air streaming in around outlets and attic hatches. Now you know where to seal.
Where this hits your build
This affects comfort, energy costs, and indoor air quality. It gets locked behind drywall, so decisions here need to be right before finishing starts.
Most people do not just struggle with terms. They struggle with the decisions tied to them.
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