My central air unit's line is frosting over and the technician determined it was 3# low on freon. Suction pressure is 40#. He has suggested it would be wiser to replace the entire system (inside and out including gas furnace, 14 SEER, 34,000BTU for $6124 ) with a newer, more efficient unit based on 410A refrigerant. It seems to me that I would be better served attempting to have the unit repaired rather than jump immediately to an entirely new system.

I would like some advice on the wisest move for me to make at this time. My current system still cools, so I would like to believe there is some life left in it if I add some freon and find the source of the leak.

Any suggestions on a plan?