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Freon is a refrigerant, or coolant, which helps your AC unit evaporate its internal heat and allows the air is expels to actually be cool. If you have sprung a Freon leak, you ll have to seal the problem area, replace the leaking substance, and replenish the amount of refrigerant in the system.. R A and R or “Freon” is the lifeblood of an air conditioner s cooling system, but R air conditioner refrigerant costs have definitely risen over the past few years. First, a li.e history lesson. The old refrigerants were bad for the ozone layer in the stratosphere..