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inexhaustible, giving solar energy a something for nothing appeal. However, though solar heating may be the cheapest way of warming houses by 1980, according to one expert, a sun-heating system could cost as much as S10.000 today. Most still say it is not practical to try to heat the house with solar energy alone; it has to be backed up—if sometimes only a little—with an oil, gas, electric, or coal furnace. But a few years ago solar heating was widely considered completely uneconomical, at best an expensive novelty.
Workable solar heating relies on relearning old principles:
Keep your house backed into the wind, like the long, sloping, north-facing roof 01 the Cape Cod house in Colonial days.
Get your house behind something for protection, like canyon dwellings backed against a cliff, or like 19thcentury bank barns half buried into hills on the north side. Or learn a lesson from igloos, rounded and offering the least possible outside wall surface to bad weather.
Button up the house snugly. Use insulated glass, tightly fitting doors, extra insulation. Try to get along without windy-side windows, but offer something like a greenhouse wall to the sunny south.
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