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Not recommended, but all of them are about the same.
Portable space heaters are sometimes used as a heating supplement. However, they are not a cost-effective way of heating your home and can be dangerous if left unattended or used improperly. Never place flammable objects on or near a portable space heater—they may ignite and start a fire.
If you must use a space heater you will find that the efficiencies are about the same regardless of the kind you choose.
Published Monday, October 12, 2009