I'm trying to finagle around the high cost of putting in two new HVAC system which will cost between $15K - $18K. I need two systems, one in the basement to blow up and one in the attic to blow down. No duct work in the walls. All the radiators are still intact in the house and I was wondering if it would be more economical and cheaper to just put in a new boiler to use for heat and then install new air conditioning up and down. The house will be our retirement/vacation property and is located in south North Carolina and we will probably spend Christmas's there and of course summers. I'm not sure how much heat capacity we really need, and I can't decide if I should just bite the bullet and get it done, or if I should reuse and repurpose what is already there if it's more economical. Thank you for your help in advance.