What is the difference between a "PassiveHouse" and a "passive solar" house ?
To put it simple: A "PassiveHouse" has a proven energy efficency performance, where as a "passive solar" house doesn't.
" PassiveHouse " is an ultra low energy building standard developed in Germany.
A Passive House needs to pass performance tests such as a blower door, to prove it passes very rigorous benchmarks of air tightness and energy consumption and is certified as "PassiveHouse" by the PassiveHouse Association.
A PassiveHouse reduces the ecological footprint by 90% compared to a house traditionally designed and built.
"Passive solar" means the design and construction applies sustainable principles, without any reference to the extent of those principles nor any reference to actual energetic performance of the house.