Also keep in mind that heat is constantly exiting a structure. The rate at which it happens is dependent on the type of structure, insulation and how tightly it is sealed. Also important is the difference in temperature between the area you want to heat compared to outside temperature. The colder it is outside, the more heat it will take to keep the space inside warm.
And it is also very important to remember that you need to keep a house heated or your pipes will freeze. Keeping an electric heater going in one room while not heating or keeping the rest of your home too cold will turn into a disaster for you.
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