[Greenbuilding] Distibution and radiant heat

[Chris Koehn]

A timely discussion for me..
I am currently planning and pricing an architect designed home to be built on one of the BC southern gulf islands that has no grid power. There will be wood burning heat- currently a cook stove and a fireplace are specified. The floor plan is rather longitudinal, with a bath & mud room at one end of the home and somewhat isolated from the main space. 
I am wondering if it's advisable to consider picking up heat off of the ceiling and moving it beneath the floor (in insulated duct, through a crawl space) and dumping it in to the bathroom area? We'd presumably need some air handling equipment, but the energy used to move hot air must (?) be less than heating the space (with propane).

Thoughts? Cheers,

Chris Koehn
TimberGuides