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Passive House Basics - the passive house design is predicated on having an airtight, super-insulated building envelope. Then you add big windows facing south to allow the sun to warm a large interior wall (or thermal mass they call it). The wall will hold heat for winter time comfort. For summer time you add a screening / shading system for those windows, preferably outside with an open air space between window and shade.
A Passive House project maximizes the energy efficiency of the basic building components inherent in all buildings; roof, walls, windows, floors and the utility systems: electrical, plumbing & mechanical. By minimizing a building's energy losses, the mechanical system is not called to replenish the losses nearly as frequently, saving resources, operational costs and global warming related pollution.
Passive House by Ignatov Architects, Kavarna, Bulgaria. A dramatic feature is the green roof but that's only one of its many features Perhaps the most dramatic feature is the huge tilted glass wall. It makes the house almost disappear from the street but performs very useful functions; explained: The vegetated roof & hunkered profile deflects northern winds during inclement weather while rain water harvesting & onsite waste composting reduce the water footprint of the home.