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The high-efficiency DSZC16 ComfortNet heat pump by Goodman is performance-rated at 16 SEER for cooling and 9.5 HSPF for heating. It’s compatible with the company’s communications system, which is designed to make installation easier by automatically setting up components for maximum efficiency; in most cases, says the company, there’s no need to manually set dip switches or modify the thermostat. A 4-ton unit costs $2,500. Goodman, 877/254-4729, goodmanmfg.com.