The one on the left appears to be HEAT only and probably for an auxiliary heat source. The one to the right controls the roof mount A/C & the furnace (propane forced hot air unit) and is pretty standard in RVs.
What that auxiliary heat source is I'm not sure. Could be fireplace, electric floor heat, or heat strip in the A/C. Maybe someone with the same set up will chime in.
*Current: 2005 Ford F350 Crew Cab Dually 6.0 diesel 4x4*
*Retired: 1987 F350 Crew Cab Dually 6.9 turbo diesel
2007 Forest River WildCat 32QBBS