I'm running into similar issues... I have 5 'compartments' in my bus separated by blanket curtains... the driver's area air temp is at ~10F with floor temps at 1F... front bench area has air temps at 35 floor at 20 (no heater here either), kitchen air temp 60 but floor at 28 (heated), store/change room air 50 floor 30, bedroom air 72 floor 35 (heated)