Winterizing home for winter ?

[loony]

Originally Posted by bigdog

Last, there is a 110v wire that comes off the gas furnace, and plugs into an outlet, what is its’ purpose ?

My guess is for a simple way to run the furnace off a portable generator. You would unplug the furnace and plug it into an extension cord run off a generator somewhere outdoors. Fairly safe, and no chance of back feeding power to the grid