I own a rather wonderful temperature controller. It has two mains sockets and a temperature probe. You could, for example, plug in a heating pad and a cooling fan to keep your pet lizards' environment in a closely controlled temperature range. I use it with a fan heater to keep from getting frost in my conservatory. I also thought I might use it for brewing projects.
I recently bought an electric under blanket and thought it would be interesting to connect it to the temperature controller. After some experimentation I'd say that 25C is a nice temperature to have your bed when you get in to it on a cold night, but that's not quite warm enough to pre-heat your pyjamas to a really luxurious toastiness.
On the first night I was experimenting with it I left the temperature probe in the bed. In the middle of the night I was woken abruptly by a loud bleeping and a dull red flashing. It took me a long time to figure out what was going on, but my body heat had warmed my bed up to 30C and it had set off the over-temperature alarm.
Richard "Your Lizards are in Danger" B
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