 your whole house fan won't work if you don't have attic insulation. If you go and buy a whole house fan and it's going into the attic but there's no way to get out, you're not really doing much. You're forcing it through cracks and crevices. Henry, what do you guys do when you put on a roof? Your dad's a real bugaboo about attic insulation, and you say most houses you go to don't have enough. So proper attic ventilation is super important. You need 50% intake and 50% exhaust, and if you don't have that...