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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.
It is extremely important that the coolant or Freon level of an air conditioning system be checked often. A 10% loss of Freon or coolant will cost the home or business owner 20 percent more in electrical costs and can cause undue wear and tear on your unit.