Agent, Lake Nona Orlando, FL It sounds like that is an average sized home and not very big. If you want to figure out the most accurate information for pricing then I would recommend looking for contractors. Once you have found a few they can quote you for it. A lot of times the duct work is the really big price with something like this. I know that a lot of people want to get jobs like this done, and it's definitely not the easiest thing in the world to figure out. I would suggest that you talk to an HVAC company about it. They would probably be able to give you a quote and explain what would need to be done to get everything set up properly. Home Buyer, Hampden Sydney, VA Agent, Winter Park, FL It just depends on how efficient you want it to be. Around $3000 to $3500 would be a safe estimate. Keep in mind if you were to pick a system with above average efficiency this number can go much higher. I do have a great A/C contractor that I have worked with multiple times, feel free to let me know if you would like me to pass along his info to you.