Yeah, there's so much integration with the system (ductwork from the AC unit, new switches on the center panel and then most of all new seats) that you are going to have one hell of a time trying to retro-fit that into a car without it. I'd estimate easily $3k (Kia shows the ventilated power seats costing $700 each and the control module is $600 sans labor). You'd likely get a better deal just trading in the car and taking a hit on the depreciation.