There are a lot of different marine Cruisair/Dometic systems in service today. What has been lacking is a wifi enabled thermostat that is reliable and simple to use. The 3rd generation Nest thermostat provides 95% of the features necessary to control a single Cruisair/Dometic marine system and it provides wifi enabled access for activation and monitoring.
Disclaimer: If you are not comfortable with high voltage electric work, please hire a professional for this project.