If it is malfunctioning you should unplug it. Turning it down is not the answer as it could still malfunction and deliver to much power causing it to overheat again.
I say get a tstat. A good tstat. I'm not sure what excuse you have for not having one already but I'm sure you will agree that the number of snakes you have in the rack are worth you spending the money to care for them in a way to better guarantee their health and safety.
With your ambient temps high enough I would unplug the heat and order a tstat.
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