Don't hook your heater up to the Ranco that controls your flex in your racks.
I purchased a seperate Ranco just for the heater. I understand heaters have their own t=stats built in but it was suggested to me as a safety precaution to keep the room from getting to hot in case the heater t-stat stuck or the room/outside temps change.
The t-stat on the heater is just to cool the heater down it is not affected by room temps. So say you got a heatwave and the room/outside temps went up into the 80's your heater would still run where as on the Ranco when the room temp hit 80 or whatever it was set at it would cut it off.
This picture you can see the Ranco in the back on the wall and look to the right on the front of the rack and you can see how I have the probe from the Ranco that the heater is plugged in.









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My old place was oil heat, electric was cheaper. If you're going the space heater route, you can get some really good energy saving ones... Toss the rack in a closet or small room for less heating area and you'll be good to go. OR... Just stick with your current crazy variance for the thermostat, but I'd suggest watching the ambient temp in the bins closely for how warm that is.
