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portable heaters, it really depends on the heater. If its a gas heater then yes, if you are using electricity to generate the heat, then usually they are not very efficient, that is unless you have a convection type heater, which are very efficient.
How much really depends on how you use then and how much you use your main heating and cooling system. Not something that can really be answered here, you will have to test it out for yourself.
Answered by
moona75ws
at
Jan 19, 2010 03:31 AM