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1 As an example 5 years ago R22 sold for $10 per pound. 2  Today R22 can be as much as $50 per pound. 3  Typical residential air conditioning unit hold from 5 to 15 pounds of R22. 4  If a coil has to be replaced or there is a leak the cost of refilling the refrigerant could be $250 to $750.
Edit Answer (for another -37 minute). No you can not use R143A in a R22 system the pressures and temperature range are different. You need to stay with R22 or a replacement that is compatible with the system components.R22 is geting expensive but the replacements are less expensive.here are drop in replacements for Freon R22, but none are approved by manufacturers. Most, if not all have a capaity loss, so less cooling.