In my opinion the best way to keep your temps from fluctuating as the temperature of your home fluctuates is to have your UTH's hooked up to thermostats. I used to use the dimmers until I realized I was having the same problem. The dimmers will just keep giving constant power to the UTH regardless of the temperature fluctuation in your home, whereas a thermostat will adjust to maintain whatever temperature you have it set at.
I ordered the hydrofarm thermostats off of amazon. I think they were about $25 and I've had no problem with them yet!
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