Hi - as said above it's always recommended to use a thermostat with any heating device. They can malfunction and reach very high temperatures and you can end up with a burned or even dead animal.
If you use a thermostat the heat source will be able to regulate itself in a heat wave and turn itself off when necessary to remain a safe temperature. I really really do recommend getting one, it will put your mind at ease and be a lot less work since you won't have to change things for winter or summer as long as your probe is correctly placed. But yes you can just unplug it if you need to.

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