Hi....I'm brand spanking new at this so please bear with me. I just purchased a 2013 cyclone 4100 three days ago. I'm tickled to death to have this coach but the wife and I did not get a real good turnover from the tech at the dealer. He was young and not to experienced. It was freezing cold and raining so I guess we might have overlooked a few things. What I would like to know is....is there anyone out there who has this coach possibly tell me what the white rocker switch over the thermostat in the living room control center marked up/down is used for? The owners manuels by Heartland are not very specific about any of the coaches. My last TH which was much smaller had an outstanding owners manuel. Any help would be greatly appreciated. Thank you.