HOUSING: G.E.'s New Heat Pump

Home builders and owners have long dreamed of a cheap and practical heat pump to maintain comfortable temperatures in homes both winter and summer. This week the dream was a big step closer to reality. General Electric Co. unveiled a new, three-ton model of its Weathertron heat pump specifically designed for the mass home-building market. The new G.E. pump will heat or cool a seven-room house in temperatures ranging from —20° to 120°. Cost: about $2,000, including installation.

The pump operates by electricity, uses a motor compressor and coils much like a refrigerator to keep the house at comfortable temperatures....

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