The Stealth hot heat pump combines a Twin-Single compressor with microprocessor-based Comfort Enhancer control to deliver cooling efficiency that exceeds 15.7 SEER and an HSPF rating of 9.3, the company says. Two pistons operate together in high-load situations. When less cooling or heating is required, the compressor switches to single-piston operation, reducing costs. Capacities range from 2 to 5 tons.
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