In article ,
"Gig 601XL Builder" wrDOTgiaconaATcox.net wrote:

www.peoamerica.net/N601WR

Too bad the floor is already poured.
The best hangar heating is via a heated floor.
You plumb it before you pour and connect it to a boiler.
Makes it much more comfortable on your feet and legs while working on
the plane during the cold months and keeps the heat out of the rafters.