Dometic A/C - Thermostat options?

LifeInsideJack wrote:
We have the typical rooftop Dometic a/c unit on our motor home. The controls for this are right on the part that is on the ceiling. Basically fan/cooling control on the left and a temperature control knob on the right that operates at either Too Cold or Not Cold with little in between.

You described your thermostat.
Mechanical thermostats usually have big difference between cutting in and out, so this is what you are experiencing.
Mine, sounds like identical gives me 5 degrees differences. Wall-mounted mechanical thermostat will have the same issue, although hopefully with slight improvement.
Digital thermostat will give you 2 degrees difference what might be better for you, although I found it sometimes annoying when AC comes in/out every 90 seconds.