Atwood Air Command AC/HP

Sounds pretty much like mine worked. 2 units ducted together. . Mine would put out heat until the sensor in the duct would register about 70 degrees then shut off. No where did it ever sense room temperature, consquently the room temp would never raise regardless of TStat setting. Inside the duct would stay at tabout 70 degrees, but never the coach. I talked to Dometic as did my RV tech many times about it. I talked to factory reps about . All said it was working exactly the way ir was designed by Atwood and since acquired by Dometic they had done no design changes especially to work with ducted systems. My Dometic units put out 100 to 110 temperature air until the room reaches thermostat setting. Atwood, unless Dometic has changed it in the last year or so, will never work that way.