The national average for central air conditioning repair is between $50 and $100 for a service charge and $300 for both labor and parts. For required services, heating, ventilation, and air conditioning (HVAC) providers typically charge fixed prices. Your costs will be determined by whether the technician has to replace components or add refrigerant, the distance between you and the HVAC company, and the season (rates tend to be higher in the summer). As a rule, the older the unit, the more expensive a repair is likely to be.