The Maytag PSH4BF is a two-stage heat pump with an efficiency of up to 16 SEER and 9 HSPF. The Copeland Ultra Tech scroll compressor is protected by a control module which monitors the compressor and shuts down the system if harmful conditions are detected. A high pressure switch, low pressure control and field-installed filter drier also provide protection for the compressor. The unit features copper tube/aluminum fin coils for increased heat transfer, and a demand defrost which improves efficiency by defrosting only when necessary. A swept-wing fan blade and compressor sound blanket help keep sound levels as low as 75 decibels. The stainless steel cabinet has a silicone-protected polyester finish with 950 hour salt spray protection against rust and corrosion.
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