I was in an interior on deck 2 last July. Hot as blazes outside. Upon going to bed I cranked the thermostat down all the way because i sleep better when it's cool in the room. I woke up freezing. I had to get up and turn the thermostat up. I quickly learned the ideal range to adjust the thermostat so i could sleep better at night without requesting more blankets.
My cruise was before football season but we have several Grandeur fans here including @coneyraven, the Grandeur Poo-Bah. I'm betting he knows.