The Stack Effect is all about how air moves through your home. Conditioned air escapes through the top of your home, the attic, and is replaced by outside, unconditioned air being pulled in at the bottom of your home through the basement or crawl space. Homes are built naturally leaky, these leaks come from utility penetrations, unsealed top plates, can lights, and even your attic access door. Leaky homes can result in high energy bills, uncomfortable rooms, poor indoor air quality, and your HVAC equipment running all the time.