Hello. I'm having an issue with my bedroom in my 315RLTS getting to hot when heat in main area is on. I've noticed there is no way to set heat temp in bedroom on thermostat. When I have main living area set to 68-70, the bedroom temp is running at 70-75. There is only one heat duct on bedroom as well. So rn, I have to keep the thermostat in main living area around 60-62 so we don't roast in the bedroom while the other part stays chilly. We have had to turn on bedroom AC to keep it cool while leaving heat on in living area. We have Airxcel thermostats. Is this normal or we don't something wrong? Thanks in advance for your help.