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English: An air conditioning unit: The coils and pipes in an air conditioning unit contain refrigerant gas. The refrigerant gas enters the compressor as warm, low-pressure gas and leaves it as hot, high-pressure gas. In the condenser coils, hot, compressed refrigerant gas loses heat to the outdoor air and becomes liquid while it is still warm.
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Dust, dirt and mold on an air conditioner’s fan, radiator or interior (as pictured here) could potentially make you feel sick. (Getty Images) (Dmitrty via Getty Images)
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