Once upon a time in the grand duchy of Indiantown Gap military reservation, two rather inventive ROTC cadets used a birthday cake candle inside a pup tent* to mitigate sub-freezing temps. It heated it up so fast that it didn't last long. So, the moral of this fairytale is it doesn't take much to warm up a small confined area. Just make sure it's properly vented.
*Known to some as a GP Tiny or two shelter halves connected in the proper way to create a tent and, yes, that was the last time I had to go that route; a poncho lean-to served me well for years.
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