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Have the thermostat on refrigerator turned all the way down (not happy at ~70F), then have two thermostats that are happy ~70F. One is hooked up to refrigerator plug and comes on over ~74F. Then have the second thermostat hooked to the two heaters that comes on ~70F. We only had the 50 watt heater (small) on left but when real cold it could not keep up, so added a second 150watt, no problem now. The pellets work well to keep stuff dry. Works great!