Compressors all do the same job,but there are several types,piston,screw,hermetic,semi-hermetic,reciprocating,rotary,screw,centrifugal, etc. Don't confuse your self with those different types most of them will not apply to you depending on your system,their purpose is to pump the refrigerant and get the job done.

Screw and hermetic are common for non-commercial us,if your compressor goes bad it is usually to do the system siting so long with out use or just debris,foreign objects inside of the system.

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