On my 2000 Sedona the A/C and Heater were optional. The dealer installed the heater in the cabinet where there was a small cabinet door. The door was removed for the installation. The controller was mounted in the rear dinette bench seat facing toward the trailer tongue. They cut out a hole and installed a plastic frame that allowed the control to be flush with the bench front so it did not stick out so it would not get hit with your leg or anything stored on the floor between the dinette seats during travel. As mentioned above there should be an outside burner inlet/exhaust plate. Mine is like the one pictured at the top in opnspaces post