A properly regulated heat source does little to nothing for ambient temperatures.
You should be monitoring the hottest surface your animal can touch. This would be under the substrate as your animal can and will burrow.
If you are trying to "feel" the temperature, what feels warm to you is actually hot enough to possibly cause burns to a cold blooded animal.
Your pet rock is not smart enough to move off of the hot area either.
You need to get that UTH on a thermostat and then either raise the room temperature or get some type of overhead heating for ambient air temperatures.
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