As a person who uses rheostats, I would highly recommend a thermostat. I keep my snakes in my room, even my venomous. One day when I was off it just so happened that my house thermostat failed(house was built brand new in 2011). This caused it to get really hot, so I had to turn off all my heating for the snakes. Had I been at work, it could of very well got hot enough to kill my snakes. Of course I live in Louisiana where the summers get really hot, but all in all, I would use a thermostat. Since that I have switched to a Herpstat 6. I will still use a rheostat for my lighting to keep it dimmed, but for anything heating related, I wouldn't do it.
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