Blower door testing is essentially pressurizing your house and seeing where the cracks emerge. By doing a blower door test you can check the quality of your insulation, the install of your windows, the need for fresh air, and the efficiency of your build. This can be done on new construction or existing homes. If you have any questions about where the air is getting into your home or if your windows need replaced or if your home is getting enough fresh air this test will help you solve your problems.
If you are in an existing home and going through a remodel in which you are thinking of redoing your hvac system a blower door test can give the hvac contractor a better idea of how they need to size the system and distribute the air. When combined with a duct blasting test this machine helps solve a lot of home efficiency and indoor air quality issues.