How best to heat a refrigerator to maintain colonies during cold winter?

With my current living situation I'll be hard pressed to keep my insect colonies alive and producing during the upcoming cold seasons.

I have a spare refrigerator that I was thinking about converting into a growing cabinet. Refrigerators are insulated well enough.

The plan is to provide a heat source with a thermometer regulated shutoff.

I'm trying to decide what is going to give me the most bang for my buck for heating. I've considered nursery heating pads, heat lamps, and even submersible aquarium heaters. Maybe some small computer fans to help circulate the heat evenly.

Any suggestions?

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