My Lasko 754201 Continuous Heater is capable of keeping my 600 square foot cab at 60 degrees Fahrenheit inside when the outside temperature is 25 degrees Fahrenheit. The difference between indoor and outdoor temperatures is a fairly constant 35 degrees Fahrenheit, so the water stored in my house (every 240 gallons) stays liquid even when the outside temperature is zero degrees Fahrenheit. If it were even colder, I could turn on the electric stove and leave the oven door open, or light my wood stove. The cost to run this heater uninterrupted for 30 days is about $110 (in my part of West Virginia).
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