Infiltration is the unintentional entry of outdoor air into a building through cracks, gaps, and openings. It increases heating and cooling loads, creates drafts, and affects comfort. Reducing infiltration improves HVAC efficiency, but ventilation still needs to be balanced for healthy indoor air.
/ˌɪn.fɪlˈtreɪ.ʃən/
Infiltration is the unintentional entry of outdoor air into a building through cracks, gaps, and openings. It increases heating and cooling loads, creates drafts, and affects comfort. Reducing infiltration improves HVAC efficiency, but ventilation still needs to be balanced for healthy indoor air.
Why does infiltration matter in HVAC?
It increases load and energy use by letting uncontrolled outdoor air in.
Source: The Cooling Company
Air leaks increase energy loss and reduce comfort.
An energy audit with a blower door test identifies air leaks around windows and doors, leading to sealing upgrades.
Seal common leak points like attic hatches, door frames, and recessed lights to cut infiltration.
“Seal common leak points like attic hatches, door frames, and recessed lights to cut infiltration.”
Air leakage can account for 20-30% of a home's heating and cooling loss.
Is infiltration the same as ventilation?
No. Infiltration is uncontrolled air leakage, while ventilation is intentional.
Can too much air sealing be a problem?
Yes. Homes still need planned ventilation for healthy IAQ.
How do I measure infiltration?
A blower door test measures leakage and identifies problem areas.
Fill out the form and we'll get back to you within 24 hours.
