Bearded dragons don't need an undertank heater or any additional heat at night as long as house temperatures don't drop below 65F on a regular basis. Occasional drops to 60F won't drastically affect your dragon either.

I can never understand why so many keepers of dragons want to have supplemental heat at night, dragons prefer it to get cooler, its natural to them. It make them more comfortable to be in a cooler place as in nature they do tend to hide in burrows, under debris etc at night to escape predators. Though some tunnels/hides can maintain a constant temperature even if it drops far colder at night based on air temp, a drop to 70F is good for them.
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PHLdyPayne

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