The New York Times has a great graphic explanation of the principles of the Passive House, "airtight buildings that use heat from appliances and even the occupants' bodies for warmth." The Times notes that while they are popular in
I'm a Passive House enthusiast. I'm involved in this great movement to create highly energy efficient buildings that use 80 to 90% less energy. But how? I get asked often what a Passive House is. This is the low down in 90 seconds.
While this is actually an indoor space, it brings the outdoors in. By creating a greenhouse addition to the home, you allow for the natural cleansing of the air circulating within the home. It also acts as a passive solar area if floored with a heat-retaining tile. Many advantages to such design.