If I understand you right, you are getting a new Montana? If that is the case, it should come with a digital thermostat (Dometic Comfort Control Center). These work fine, and there should be no need to change it.
If you get an earlier one with the remote thermostat, read the long thread on the remote, and take steps to get it replaced with the Comfort Control Center (only one that will work in that situation).
If you have a still earlier model, then you may have the analog thermostat, and that can be replaced by the Hunter (or any other self-powered digital thermostat).
Hope this covers all the variations.
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