You can add a furnace to a Habitat or Summit build. The Propex HS2000 fits in very nicely, it has a small foot print, 12.6" long x 6.8" wide x 3.9" tall, and the exhaust and combustion air come in from the outside. Heat output is 6483 BTU at 60 C.F.M. and power consumption is 1.9 amp when the...