Homeowners can usually do a relatively effective air sealing job if they have the time and patience and are conscientious about air sealing in areas that can be difficult and uncomfortable to work in (e.g. the attic). However, professional air sealers can usually do a much better job because of their experience in locating and sealing leaks.

Contractors may use a depressurizing fan door (sometimes called a blower door) with smoke pencils to locate air leaks and use specialty caulking and sealants. The infrared scanner, used in conjunction with a blower door test, is also a powerful tool to locate air leaks and missing insulation.

Many air sealing companies also offer testing and assessment of ventilation and combustion air requirements, including testing for backdrafting.