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Story summary
- Manufacturers now sell window heat pumps in the United States that provide both heating and cooling from a single plug-in unit.
- A typical unit costs $3,000-$4,000 and can be installed by the user without professional help.
- The pumps use less than half the electricity of conventional electric heaters, though efficiency drops sharply below –13 °F.
- Some lower-priced models lack efficiency ratings, become noisy, and stop operating in very cold weather.
