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Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.
Are you sure that the thermostat is the issue?
Do I understand that you "smashed" it? Guess that would make it pretty much toast. Do you have one A/C or two?
That thermostat is NLA and so you will need to upgrade to a newer version. If you have just one A/C you can use a Dometic Single Zone thermostat which comes as a kit. If you have two A/Cs you can use a Dometic Comfort Control II version and that can be purchased as a kit and additional board for the second A/C. Get back to me with the model number(s) of your A/C(s) and I can give you the part numbers you need. All follow ups are included in our fee.
You are going to have to upgrade to a newer thermostat and control box. If you look on the underside of the A/Cs once you remove the ceiling grill and air filter I can tell you which parts you need.
Lots of places sell these. AdventureRV online or PPL or Amazon or E-Bay are just a few.
This grill is the large one that is about 18" square over the A/C in the center of the ceiling. The control box is in the A/C or it may just have a computer board. Once I have the model number off the A/C I can get you the part numbers you need. Dometic has over 3 dozen different models.
Is is a grill work where the A/C air filter is. There are two of them........one on each A/C. The air return goes right up through them.
You have to have one for each A/C as that is where the filter is. I am attaching a photo of one so you can see what you are looking for. http://www.adventurerv.net/dometic-duotherm-brisk-air-ducted-ceiling-assembly-p-23211.html
O.K...........I can see this isn't going anywhere. I will opt out and let another tech offer something for you. You might just need to have a mobile tech come over and assist you here.
No........center of the ceiling right under the A/C. Don't respond here or it locks me back into the question.