Did you know that heat losses through the ground to the outside air are the third cause of heat loss in American homes?

That accounts for more heat losses than air leakage, as our research found out.

In this video, we illustrate how heat escapes from the floor slab, through the dirt underneath the house, to the outside air.

We show this by looking at an actual project detail from a home retrofit in Montana.

#passivehouse #buildingscience #energymodeling