The price to install central air conditioner units with heating unit is between $6,500 and $15,000. The HVAC installation costs are for complete heating and cooling system and labor cost. To get little more accurate price in your area, check out the links below.o replace central air units and furnace unit without distribution system is between $5,000 and $10,000. If we paid HVAC contractor $5,700.00 to replace central air conditioner units with furnace I would said that good deal.