Have RV Questions? Ask an RV Mechanic Online.
Many of those older Duotherm thermostats are NLA and you have to upgrade to a new setup. I don't know if they make one that will work on a basement A/C and will have to check. I will get back to you on that, but give me the model number of your A/C unit so I can get the correct info.
Let me call Dometic and get back to you later today........
Not goo news.........none of their newer thermostats will interchange. You will need to find a new one at a surplus place or used one. Try Northwest at(###) ###-####as they bought a bunch of that sort of thing when Monaco went out of business. I just got a new HWH part there for less than 1/2 of new price. E-Bay is a good source sometimes. Also Arizona RV Salvage. Let me know what happens.
Should have been "good" I think.......LOL!
Last resort if none can be found would be to rewire this using a different control board and thermostat. That model is different than all the rest so it can be a challenge I suspect, but not for a good HVAC guy. Send me a photo of the thermostat with the cover off and maybe I can think of something.