Do you have Ducts? Or do you need them installed? Prices start around $4,500 for ducts being there and can go up to $10,000 if not. Lots depends upon location of duct system, Power runs. How far the outside unit is from the inside unit. My suggestion is however try to get at least a 14.5 seer unit or higher. Much better rebate programs so you pretty much get a lot of that extra cost back so price ends up about the same.