We bought a dog heater for our "cat house" for the winter. We live in Canada where it gets down to -40°C and even when it's very cold (only down to -35°C this year so far) a dog heater keeps the house warm. The house is about the size of a large doghouse, 4 feet by 4 feet inside, for reference. I highly recommend this product to keep your outdoor animals warm in winter. On a low setting the heater will definitely keep the temperature above 0°C and won't affect your electricity bill much.
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