Heaters
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The room heater works to provide warmth by heating the air in the room which then produces an atmospheric cooling that keeps it warm. The space heater, on the other hand, works by radiating heat outwardly to produce a greater "area" of warmth.
Space heaters work best when they're tucked against a wall where there isn't another appliance already using up all of its power drawing from the outlet. This way it doesn't have to compete with anything else for energy and can focus all its power on heating your space instead.
That's why you should use a small one in a large area, or a large one in a tiny bedroom unless you're trying to feel stealthy and want someone else to be able to spot it.
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