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Understanding how your air conditioner works will help you know when to call an air conditioner repair man. All air conditioners use heat transference to move energy. AC units circulate pressurized chemical refrigerant through a sealed system of tubes and chambers. One side of the system is high- pressure, and the other is low-pressure. As refrigerant passes through the low-pressure chamber (the evaporator), liquid refrigerant changes into a vapor in a process that takes heat energy out of the ambient air. The vapor carries the energy to the high-pressure chamber (the condenser). As the vapor changes back into liquid inside the condenser, the stored energy is released. A compressor pump moves the refrigerant, and a calibrated restriction in the lines maintains the pressure differential. Fans circulate air across both chambers to facilitate the heat transfer.If you have any questions or just want to learn more, ask one of our experts for a more details about the components of an air conditioner.