It is highly improbable and not likely that an HVAC mech could install Puron Refrigerant (Carrier's 410A R-22 Refrigerant replacement) or Refrigerant 134A industry wide R22 replacement. Neither of these replacement non ozone depleting refrigerants are compatible with R 22 systems. It is unlikely that anyone could install the the new into the old systems because the mechanical connections on the refrigerants and gauges are different.
Your new refrigerant line set piping if installed from garage air handler up to and across attic then down the outside of house to condensing unit should not exceed fifty total feet. It -should also be pressure tested to assure there are no leaks. The suction line (larger of the two should also have excellent tight insulation or it will sweat in the attic causing moisture/mold problems as well as high super heat causing early compressor failure. It is also critica that they install the proper amount of refrigerant.
PS: Is the air handler condensate piping by gravity in the garage or is there a condensate pump?
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