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A History of Comfort with Low Technology
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20 per cent Absorption chillers additional amount architectural attitudes average become boiler btu per square built capacity capita characteristic collector complete components construction cooling cost developed ducts economic effect efficiency elec electric heating electrical energy energy conservation energy savings ergy example facade figures fixtures floor fluorescent foot-candles fossil fuel glass greater growth heat pumps hot water illumination increase industry installed Kwhr lamps light levels Limits to Growth load materials mechanical megawatts Metula miles million billion needs nuclear office buildings operate over-all pattern performance pipe plants problem produce projections pumps reduced residential result schools sewage solar solar collector space square feet square foot square mile standards structure surface tasks temperature tion total energy tricity United usage utility ventilation visual wall waste heat watts World Trade Center York City