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Old units used R12 or R22. New units use R134a. You shouldn't need to buy any refrigerant (not "refridgerant") for a window air conditioner, as these units are hermetically sealed at the factory, just like refrigerators and freezers, and typically won't lose gas for their entire service life. If it is no longer cooling properly, the coils may be dirty and in need of cleaning, the condenser fan may have failed, or some other component may have failed. If the unit is over 10 years old and has been used heavily, the compressor may simply be worn out, in which case it's time to replace the entire air conditioner.

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