Heating space between hulls

[Jim and Chris Neuman]

Living on the Northwest coast of Washington we rarely get temperatures low enough to cause freezing issues while in winter storage.  It does happen though and the potential for freezing damage does typically raise its head a few times each year while during the winter months.

I have been giving some thought to the installation of an electric heater designed to keep warm air moving between the hulls when temps drop into the 10's & 20's.  A small, high quality electric heater permanently installed which draws in cabin air and routes it through areas between the lower hulls where plumbing and other temperature sensitive components live could serve the dual purpose of protecting trailer components from freezng and help keep things warmish and dry.

I understand this system would only be functional while on shore power.  Anyone here designed and installed such a system?