When houses are built extra tight to reduce energy costs, we seal everything inside. There are things in the air you can't see, smell or taste. Radon, formaldehyde, carbon monoxide and dioxide and many others. Our energy efficient homes are plastic bags on our heads, we're getting sicker and sicker and people have trouble figuring out why. The solution is ventilation and it's time to get some fresh air in these homes- without losing energy efficiency.