To adhere to Passivhaus standards, the house has a tightly-sealed shell, a smart ventilation system, and plenty of windows to let in natural light.  Photo 3 of 4 in Professor Teaches Physics with his Solar-Powered House by Allie Weiss

Professor Teaches Physics with his Solar-Powered House

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To adhere to Passivhaus standards, the house has a tightly-sealed shell, a smart ventilation system, and plenty of windows to let in natural light.