Be careful—it can heat up quickly and harm your plants.
Exactly. Make sure to vent it well.
Should I bring it inside when night falls?
Since it’s warmer during the day, bringing it inside at night defeats the purpose.
Not unless it’s getting cold at night. The real issue will be during the day. Drill some holes on top to let warm air escape and near the base to let cool air in. This will also help with humidity, preventing mold from forming in a small, warm, and unventilated space.
Consider this carefully. Heat is the main issue. When is the hottest part of the day? Bringing it inside at night, when it’s cooler, won’t help with the plants overheating during the day.
Do you mean bringing it indoors at night? Maybe. It depends on the weather and the type of plants you’re growing. It won’t stay very warm at night, so if the weather is freezing, you might want to take it inside.