Is a blower door test worth it?

Yes, a blower door test is worth it and is considered one of the most valuable diagnostic tools for home energy performance, comfort, and health. For $200 to $500 as part of an energy audit, it quantifies exactly how leaky your house is in CFM50 and ACH50 and helps prioritize air sealing improvements that typically save 15 to 30 percent on heating and cooling bills with payback of 1 to 3 years. It also identifies hidden leak locations using smoke and infrared that you cannot find visually, such as attic bypasses, recessed lights, plumbing penetrations, and rim joists, which cause drafts, cold floors, ice dams, and moisture problems. For buyers, it provides objective measure of envelope quality beyond visual inspection. For new construction, it verifies code compliance and builder quality. For weatherization programs, it measures before and after improvement to prove savings. Even if you do not do full audit, a blower door test is worth it if your home feels drafty, has high bills, uneven temperatures, or you plan insulation or HVAC upgrades, because sealing air leaks is usually cheaper and more effective than adding more insulation or larger equipment, and test ensures you get fresh air ventilation right if house is very tight.