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What refrigerant does my AC unit use, and is it still available?

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Older AC units typically use R-22 refrigerant, which has been phased out due to its harmful effects on the ozone layer. Newer AC units use R-410A refrigerant, which is more environmentally friendly and widely available. If your AC unit uses R-22 refrigerant, it may be time to consider upgrading to a newer model.