You've insulated and caulked, but your house still fills cold and drafty. It's time to search for the remaining home air leaks: Inspect bottom plates, electric outlets and switches, beam pockets and junctions, vanities and sinks.
A blower door is installed in one of a home's entries so that the building can be pressurized to find air leaks.
PHOTO: DOUG LEE
Instrumentation on the blower door allows the pressure to be adjusted inside the building.
The energy auditor searches out air leaks by checking likely spots with a smoke pencil.