I know everyone says backfeeding is safe but the fact my insurance will not cover any damages including if my house burns down is enough to deter me.
I really want to get a transfer switch installed so I can do it to code but for now extension cords work fine.
My post had zero to do with back feeding. Unplug your furnace plug it into your generator. It is 100% isolated. Back feeding is a bad idea risking the lives of the lineman. If your insurance would deny this claim change carriers. Your liability coverage covers stupidity every day.