Hello and welcome Anna.
I use a greenhouse all year round apart from when my lot are hibernating. This time of year I use a 150w ceramic heat emitter in the open area of the greenhouse and I have a large (lot of torts to fit in it) wooden box with a small tubular heater in it set at about 15 degrees most will choose the box to sleep in at night. As soon as the outside temps warm up at night to +10 I turn it all off.
He will be fine in the greenhouse until it's warm enough to go out in the daytime
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