I now have one of those single circuits transfers on my furnace. It was a breeze to install. I actually mounted it near my furnace because it's 1/2 way between my breaker box and the access for my emergency power. I have been told it's supposed to be next to the circuit breaker box so if I ever sell, I'll remove it to avoid making anyone nervous.
Before that, I used a cut-out with a plug end. When I need it I popped the breaker and disconnected the feed at the furnace switch and tied in the cut-out instead of the main feed. I even had it all set up to go in a junction box so I wouldn't have to remember where I put anything. The only thing on that circuit is the furnace and I understand that's the recommended way to hook it up.
Everything else gets extension cords but my house is so small it's not a hardship. I may eventually get fancier but I am comfortable working at this level.
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