Jake is at Matt's house to retest his houses air tightness. But before we just throw a number at you, let's talk about what a blower door test number means and what it's based off of. This score can be an important indicator of whether or not you have a giant, unknown leak in your house, or can get passive house certified so be sure to watch this video to understand exactly what this test is saying and then watch Matt's Friday video to get the updated score on Matt's house.