No, It is better to put the bucket in a container full of water and then use the aquarium heater to heat the water around the bucket. The thermal mass of all tht water keeps the temps very stable. I use a big 80qt cooler and an Aqueon Pro heater to control temps. It can keep the water to within +/- one degree.
I have a saison fermenting right now at 85 in my basement that is in the low 60's.
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