LBNL analyzed the air leakage measurements from 134,000 single-family detached homes in the US. This calculator computes the expected air leakage distribution for homes with selected characteristics. The predictions are based on results from the multivariate regression.

Floor Area (sqft)

Ceiling Height (ft)
(calculation assumes house height = ceiling height + 2 ft)

Year Built Before 1960 1960-1969 1970-1979 1980-1989 1990-1999 After 2000

Weatherization Assistance Program (WAP) qualified? No Yes

Home rated for energy efficiency
(e.g. ENERGY STAR certified home)? No Yes

Region Humid Dry Marine Alaska
Climate zone 1 2 3 4 5 6 7
See IECC climate zone map; also residential energy code requirements

Foundation Type Slab Conditioned basement or unvented crawlspace Unconditioned basement or vented crawlspace

Duct System Location Inside conditioned space Attic or basement (unconditioned) Vented crawlspace