Dimmers are for lights and fans and should stay that way.
When regulating a heat source with a dimmer, it will only stay roughly at the set temp if your room temperature is stable. If the room ambient temp gets warmer, the heat pad will still get warmer despite having a dimmer.
Overall, it's just really unsafe to use a dimmer as a primary source to regulate the heat source. It doesn't regulate the heat to maintain a set temp. It doesn't turn on or off when it reaches a set high or low point either. Everyone should just invest in a thermostat. It's the most important piece of equipment. It's one of the easiest things a keeper can do to keep their animals safe.
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