Empowerhouse: an affordable, net-zero Passivhaus in DC

The Empowerhouse is an affordable, net-zero Passivhaus design, that came out of the Solar Decathlon competition.  In collaboration with Habitat for Humanity, the team as built a duplex in the Washington DC area that is site net-zero, despite having the smallest solar array of any of the homes entered in the competition.  It was able to do this because it took a Passivhaus approach, aggressively minimizing all loads first, sealing the building nearly airtight, and super-insulating it.  They also integrated a rooftop garden and terrace.  By sharing the heat management equipment between the two relatively small units, they were able to reduce costs substantially.  All this means the low income residents will spend much, much less on energy over the lifetime of the building.  We need more affordable housing that looks like this.

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