Okay So here is where I am at with this. Most (All that I have found) Residential thermostats are powered by 24vAC from the Furnace and send out a 24vAC signal to power on the Furance or AC. As you know our RV's are 12vDC.
I did purchase this Thermostat
http://www.amazon.com/gp/product/B00...f_rd_i=desktop
and a few other items to drop the 24vac to 12vdc coming out of the Thermostat that sends the signal to the Furnace and or AC to kick on.
So Heat works fine with this however when the AC comes on the heat comes on also. Still some tweaking to do but as of now not sure I can make this work 100%. Really needs to be a 12vdc thermostat.
SOCALCPA I am at a loss as to how you made yours work given the parameters that we are working with
I haven't given up yet.......