I installed a single pole 3 way switch to the basement fan. One position the fan comes on with the factory furnace, one position the fan can be turned off not to run at all, and one position the fan runs on its own. I can run my fan while using my baseboard heat or my Cat 3 heater. No need to run the furnace.
2009 Silverado 3500 dually D/A, Supersprings, Stable Loads, Bilsteins, Hellwig Sway Bar.
2010 Arctic Fox 1140 DB, 220 watts solar, custom 4 in 1 "U" shaped dinette/couch, baseboard and Cat 3 heat, 2nd dinette TV, cabover headboard storage, 67 TC mods