Space heating in a cab over bed is challenging.
Due to the vents all exit at floor level and one third of the habitat is in the cab over bed. We planned for air movement with two circulating fans one mounted in the bed area and one mounted in the dinette area.
There are two wall sections connecting the bed area. (1) one small one in the kitchen. (2) one large one on the bathroom.
The bathroom is water sealed and cannot be altered.
On the small wall is the kitchen and a kitchen cabinet with a stove exhaust fan mounted below.
If this cabinet door is opened on cold nights heat can enter that cabinet as heat rises. Inside that cabinet we will retrofit a panel fan 12v to push air into the bed area from the cabinet mounted close to the ceiling.
As a supplement we will use 12 v heating blankets.