Forced air heating and cooling systems often use a plenum where the air flow can be adjusted to each branch of the system. I doubt that Thor uses one, so all branches should receive the same flow rate of heated or cooled air. A disconnected branch or a blocked branch will have a greatly decreased air flow.
I'd look for constrictions in the hose that flows air to your bathroom. And, of course, you should always carry a small electric heater. You are paying for all of the power that is provided, so why not use it.
John
Athens, GA
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