Here is a write up I did on how I upgraded my thermostat from the manual slide type to a digital one. Improved the temperature consistency quite a bit.
http://www.loveyourrv.com/hunter-42999b-digital-rv-thermostat-install/
I recently had a commenter named Frank on the blog, post a pdf with details to upgrade to a brand called LUX
Here is a pdf file I created using a LUX DMH110a non-programable digital thermostat for my Heartland North Trail travel trailer. Some info is trailer specific, but all info is usable no matter what type of RV you install this thermostat into. This product has Lux Thermostat company support where hunter doesn’t.
https://docs.google.com/file/d/0B7sPSmXSOyLZcF9rYUdjenRZdVE/edit
