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When buying a used air conditioner, you can check for things like
Refrigerant levels: Low levels can cause damage to the compressor and heating unit, and can also affect the unit's operation. Changing or refilling refrigerant lines should be done by an HVAC technician, and can be expensive.
Noise level: The unit should not make more than 50 decibels of noise.
Unit condition: Look for dust, wear and tear, and other contaminants.
Airflow: Assess the airflow coming out of the vents.
Cooling performance: Set the thermostat to a desired temperature and observe how well the AC cools the room.
Filter: Remove and clean the filter. If you see or smell mold, ash, or mildew, it could indicate a problem.
Fan and compressor: Inspect the fan motor for damage. Other issues include slowly rotating blades, or the AC unit making a loud noise when the fan is on
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