For every unit of energy to drive the compressor, the pump yields four units of heat.

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The poults are fenced in around brooder units with heat lamps when young to keep them warm.

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He said well-designed systems can operate effectively in the UK, delivering in excess of three units of heat for every unit of electricity used to pump the heat in and around the property.

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As small heat-and-power units spread to homes and offices, the inefficiency of dirty coal-fired power plants would be exposed.

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Sears, for example, has developed a response model based on weather, e.g. targeted emails on window AC units during a heat wave targeted at relevant zip codes 3-5 days after a heat wave.

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Then by motorcade it's off to Aavid, a worldwide maker of heat sinks used to cool off heating units on appliances.

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The remaining 52 units would become low-temperature heat, usually disposed of as waste into adjacent rivers or the air.

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