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Super-Efficient Heat Pump

By Charles Wardell Mitsubishi Electric HVAC, has introduced the first residential split system heat pump to power three indoor zones from a single outdoor unit. It includes a compressor technology that the company says has, until now, been limited to commercial units: a variable-speed compressor that ramps up or slows down according to what the indoor unit is calling for. That means lower energy use and faster response to temperature swings. More

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