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Is the home as energy efficient as it could be?
There was a 'Canada' home designed in the 1970s, after the Arab Oil Embargo.
For Toronto, Canada, with a family of four, and junk mail, the house could maintain indoor temperature without utilities, in a statistical 100-year Winter, relying solely on the metabolic heat of the four persons, augmented by combusting the normal 'junk mail' in a condensing furnace.