In Portland, 1 kw-hour can be collected with 85 sq ft single crystal silicon collector, These habitats would use about 2.5 kw-hours per day, requiring roughly 200 sq ft of solar/unit.

To address our hot water needs, would require 40 sq ft for solar hot water most of heating 10 months

Distributed Woodstove, put in the sauna, would gain the heat during the remaining two months a year.

To reduce the Energy load to heat and cool the habitats, the house is constructed to meet Passive Haus requirements-which means super insulated homes use R50 walls and R 75 roof.