This type of question comes up a lot Russ. You are providing information that is very similar to Triton's post. You say that your temperature ranges from 72° to 76°. But it sounds like this reading is coming from a thermometer that is up off the ground - away from the heat source.
In my opinion, there is very little reason to monitor the air temps for our BRBs. They spend 90% of their time coiled up on the ground. If we're using under tank heat (UTH) then we need to know the temperature of the surface of the floor of the cage. This is where our animals are contacting the heat.
All of the stick-on heat sources I've had experience with get way too hot unless they are controlled with a dimmer switch or, better yet, a thermostat. However, I won't argue with facts. In triton's post, he said that even though he wasn't controlling the heat, the pad in the cage seemes to buffer it. When he read the heated surface of the cage it was within acceptable range.
If you're not controlling your heat source, my guess is that it's getting too warm. Again, if you measure the temp of the floor of the cage above the heat source and it's no warmer than 85°, then I won't argue with you.
All of a sudden, I wonder if people are using UTH to try and warm the air of the cage. This is probably not the best way to do it. If you want your air temps to be controlled and not your floor surface temps, the best product I've seen are the Radiant Heat panels from Pro-Products.
Hope this help a little. If you're still unsure of your set-up, ask away,
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Mike Lockwood
www.tooscaley.com