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Scam kind of, but it is honest saying that it will save you money, if you turn your themostat down and use it to heat the room your in. But any $20 electric resistant heater does the same with the same efficiency, 100%. Put the biggest incadesent light bulbs in your house you can and get the same efficiency. 0.09 cents per hour is about what 1 KWh cost, actually little less on my bill at 0.12, same at 10 100 watt light bulbs on for an hour, and you'll get the same amount of heat.
Problem is unless you have resistant heating of the whole house, almost all other fuels are cheaper per KWH or Btu. Close off the ducts in the rooms you aren't using, turn the t'stat down to 60 degree, put on a sweatshirt and toughen up.
Our wood stove got it up to 63 in my living room last night and my 10 yo & myself could sleep as it was too hot.
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