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This means that breathing low concentrations of freon from a leaking refrigerator or air conditioner over a long period of time is unlikely to have a cumulative effect, and thus few, if any, long term health effects.
Regulation of Freon in HVAC Units. 1  Any owner of cooling equipment which uses more than 50lbs of freon must repair all found leaks within 30 days of notice. 2  All HVAC equipment using more than 2,000 lbs of freon must install a special system that will detect leaks immediately.