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We use this principle in the fledgling citrus grove to protect the young trees. Frosts only occur here for about 3 months of the year so in our typical slapdash fashion we haven't bothered to construct anything permanent. Hopefully in a few years the trees will be big and tough and grown up enough to face their own frost demons so they won't need our help. It all looks a bit Steptoe and Son, with various lengths of old canvas, random lengths of unused fabric, damaged horse rugs, assorted tarpaulins and off-cuts of shadecloth propped haphazardly over any plant that needs it. Still, it works.
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The trees don't need to be kept warm, not by human standards anyway. 2 - 3 degrees above freezing is enough to deter damage and the makeshift covers ensure the ice crystals don't touch the trees. The cats prefer ice crystals not to touch them either.
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