Just type "thermostat" in the search box here or most any RV forum and you will get all sorts of help. Upgrading to a digital thermostat is one of the most popular modifications RV owners do and with the variety of models available, you're sure to find one that suits your needs.
The only feature that you may lose by installing a household thermostat is the High/Low fan control. Many people just use the low fan speed and tape off the high speed fan wire. Others, myself included, install a SPDT or DPDT switch in the thermostat to retain the fan speed feature.
If you use a thermostat other than the ones used by other forum members, please post your install here and if you can please imclude pictures.
Steve & Lauren
2011 Windjammer 3065W
2012 Ram 3500, 6.7 Cummins