How would this improve upon just having electric heat or radiators in each room? If you put it in the register, you have to wire/plumb all the way to the room anyway. The only significant potential gain I'm seeing is if you can zone the cooling as well.
I'd also worry about packing enough heating for a whole room into a duct. If for whatever reason you don't get enough airflow through that duct, it could quickly become a fire hazard.
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