RE: Need help purchasing thermostat for AC and heat
The one you want for no heatpump and no heat strip is 3313198.000 if you want the digital upgrade kit.
Is this what you are looking for?
http://www.ebay.com/itm/Dometic-Analog-Wall-Thermostat-Furnace-Heat-Pump-Trailer-RV-Camper-Motorhome-/221134167215?pt=Motors_RV_Trailer_Camper_Parts_Accessories&hash=item337c9f9caf&vxp=mtr
