Gallery: US Passive House Conference Showcases Loads Of Green Building ...

The most exciting aspect of future high performance homes may be the recent innovation of Phase Change BioPCmat, a waxy material in a plastic blister pack which when placed inside a wall can retain and release heat at prescribed values. As the wax melts at say 78 degrees it can store the equivalent heat as 12 inches of concrete in just half an inch. By absorbing heat in the day and releasing it at night buildings can use much smaller HVAC equipment, thereby saving money and energy while keeping interiors comfortable. It doesn't get more passive than that.

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