Designers and remodelers with the aim of building green are going passive. A passive house is completely airtight with energy efficient insulation, multi-paned windows and an HRV system. The result is a home that requires little or no energy input to control indoor climate throughout most of the year. Here, Hans-Jörn Eich of Pinwheel Builds explains the basics and benefits of passive house design in a 90 second video.