Hey, Brad, I have the same GH and while it is probably a day late and a dollar short, I installed a 1/2" NG line to the GH and use a 20,000Btu vent-free NG heater and have the same 15,000Btu electric as my back-up. At this point I guess you could run the line along side the GH and tunnel under the floor, but that would be major work. I posted pics of my set-up in a thread in this similar topic (Heater for Small GH) about back-up heating. So do you like your SunGlo?
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