A Compressor This is the heart of an air conditioning or heat pump system. It is part of the outdoor unit and pumps refrigerant in order to meet the cooling requirements of the system. " data-gt-translate-attributes="[{"attribute":"data-cmtooltip", "format":"html"}]">compressor replacement may cost anywhere from $800 to $2,800, depending on the AC AC, A.C. or Ac may refer to: Air conditioning, technologies for altering the temperature and humidity of air; Alternating current, a type of electrical current in which the current repeatedly changes direction. " data-gt-translate-attributes="[{"attribute":"data-cmtooltip", "format":"html"}]">AC  brand and if any additional parts are needed. While this is not an inexpensive part to replace, remember that financing is usually an option. Talk to our HVAC Abbreviation for Heating, Ventilating and Air Conditioning. " data-gt-translate-attributes="[{"attribute":"data-cmtooltip", "format":"html"}]">HVAC  contractors to see if you need to replace the entire system or if you can replace the Compressor This is the heart of an air conditioning or heat pump system. It is part of the outdoor unit and pumps refrigerant in order to meet the cooling requirements of the system. " data-gt-translate-attributes="[{"attribute":"data-cmtooltip", "format":"html"}]">compressor  only.