Passivhaus

A passivhaus is any building designed to maintain a comfortable indoor air temperature without any active heating or cooling.

To stay warm in the winter, a passivhaus relies on sunlight and good insulation. The colder the winter, the more insulation is needed.

^{[RESEARCH needed]}

Passivehauses are more complex to build, requiring more labor & energy ^{[QUANTIFICATION needed]} and possibly rarer materials.

The increased environmental footprint of construction needs to be weighed against the energy saved on heating & cooling.

Same type of analysis also needs to be done for retrofitting existing buildings to be more passivhaus-like. ^{[Case studies needed]}

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