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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.
With out knowing the EXACT version of freon that was used in your refrigerator, one can only comment on the general health effects of freon as a whole. The most serious side effect of freon exposure would occur at the time of initial exposure. People who have a history of heart problems should be very concerned about Freon because it can cause cardiac arrhythmia (irregular heartbeat), and palpitations at very high concentrations.