My main stat for both heating and cooling, seems to work heating just fine, but sometimes during the cooling mode, it moves it's set point down to 72 deg. even when I have the RV in semi-storage (in my driveway) and stat set at 85 deg. I never really turn everything off, its either 85 cool or 60 heat. I have seen others just get rid of the oem stat and go with a battery operated stat and make some minor wire changes. My cooling system is non-heat pump, just straight cooling with gas heating. My 2nd stat is just for cooling from the 2nd unit and it seems to work fine (stays where I set it). Good Luck!!
2015 F350 DRW, 2015 Sequoia SQ38HRL, G614's, Titan Disk Brakes, Trail-Air Flex Air pin box, SRE4000 w/ X-brace, Heavy Duty Shackle Straps w/ Wet Bolts & New Springs.. Now I am done for awhile.