How long it usually takes to replace an AC unit is 4 to 8 hours for standard replacement with existing ductwork and electrical, and 1 to 2 days if new ductwork, furnace, or major modifications needed. For typical 3-ton central AC replacement like Trane XR16 or Goodman GSX14 where outdoor condenser and indoor evaporator coil are being replaced and ductwork and line set reused, crew of 2 technicians takes 4 to 8 hours to complete job: first hour to recover old refrigerant and remove old outdoor unit and indoor coil, next 2 hours to install new outdoor condenser pad and unit and new indoor coil on furnace, next 1 to 2 hours to braze new refrigerant lines, pressure test with nitrogen at 150 PSI, evacuate with vacuum pump to 500 microns, and charge with R-410A or R-32 refrigerant at 6 to 12 pounds, final 1 hour to wire thermostat, test operation with temperature split check of 18 to 22 degrees, and clean up. If replacing furnace and AC together as complete system, takes 8 to 12 hours or full day. If installing AC in home with no existing ductwork, installing new ductwork for 2000 sq ft takes 2 to 3 days additional. Permit inspection may add day. Weather can delay outdoor work if raining. Best to schedule replacement in spring or fall when HVAC companies less busy, allowing same day completion.
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