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Hi my name is Robert.....
Yes it sounds like the thermostat is at a fault if you have to raise the temp up to get it to kick on. IF it was not kicking on at all then it could be another component but since it is coming on then it is sending a signal to the furnace, I would replace it. Most RV parts stores should be able to tell you what options you have for that, when calling I would get the make and model of the AC unit as well.... Hope this helps some... Robert
Hi was just checking in to see if my answer helped, IF you have more questions or concerns please feel free to contact me... Robert