Has anyone added a diesel heater such as Espar or Webasto to a sailboat already equipped with Air Conditioned Ducting? I do not have a generator on board and wish to add cabin heat for our pending cruise this summer up to Nova Scotia. Is it possible to utilize the existing AC duct work if I add a air ducted heater. Or should I plan on adding redundard ductwork and consider the hydronic versions of these heaters to minimize the additional space required for the ducting? I am, in the process of purchasing a Bavaria 40 Center Cockpity boat that I plan to modify.