For what it's worth, I think that if you're in an especially cold room or especially if the room temp will vary substantially, you're better off with two separate heat sources controlled independently to get what you want for the hot side and the cold side.
In my case, I don't have A/C in the summer. So the same room that ranges from 55-65 degrees in the winter is more like 75-85 in the summer. There's no way I could set up a single heat source so that it would give me correct temperatures all year round, without constantly repositioning the heat source, the thermostat probe, etc. The requirements are too different between a case where the hot and cold sides are 35 and 25 degrees away from the room temperature respectively, and a case where when they are 10 and zero degrees away. With two independent heat sources, the thermostats take care of it even when the room temperature changes.
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