One of the last items still contributing to major energy losses in our new homes is air leakage. But as we build tighter, the typical adage “fresh air by leakage” is no longer a viable ventilation strategy. With mandatory blower door testing on the horizon for future code cycles, addressing how we ventilate our homes is a priority. In this article, I will outline the four most common “ventilation strategies” we run into for residential construction, how they work and whether they are actually providing quality outside air.