The compressor is the heart of an air conditioning system. It pressurizes and moves the refrigerant back and forth from the condenser to the evaporator. It is probably the single most important and expensive item in your ac system.  This single item can make the most impact on the operation of your home comfort system.  Make sure to make the proper choices.  Here are a few advantages and disadvantages.  (single stage vs two stage compressors)

Single Stage Compressors

  • Simple to work on
  • Cheaper to replace
  • Readily available for repairs


  • On/off control
  • The unit must run at full capacity even if only a small amount of heat is needed

Two Stage Compressors

  • Greater control
  • Greater humidity control
  • The first stage could be used on low needs days and save energy
  • Greater efficiency


  • Higher cost
  • More complicated to repair or replace
  • More complicated refrigerant charging process
  • Not readily available to replace and may have to be ordered

There is also a third choice that is moving in greater and great availability. It’s called Variable Refrigerant Volume (VRV). It is much more expensive and allows for any need for ac to be exactly met by varying the cooling capacity of the unit from 30% to 100% of the size unit. It is the ultimate in efficiency, comfort and cost. Currently the only central AC system on the market is manufactured by Lennox.



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