If you are planning on replacing the entire system including the thermostat, then I recommend the Furrion Chill HE RV Air Conditioner System - Single Zone - 15,000 Btu - Black # FR23PV. It's the highest rated BTU and will work with your ducted system. It is one of the quietest models at 66 decibels. It cools better than the Advent and Atwood air conditioners and uses less energy. It comes with a start capacitor to store energy for the initial startup to get the air conditioner running.... view full answer...