No problems with mine. I have to turn it down pretty cold during the summer months. Don't be surprised if it takes 24 hours to really get cold, though. It won't be cold in an hour or anything like that. If you have the thermostat turned down and after 24 hours it still isn't cooling, you might want to see about having it repaired or replaced.
Mike in Tennessee
Former 2 time FR owner
2007 Crossroads Cruiser 30QB Fifth Wheel
2008 F-250 Lariat 4x4 6.4 Powerstroke
Firestone Ride-Rites w/cab control