The cost of purchasing these heaters are one thing, very cheap. However, in most regions electricity is extremely expensive. One heater running at a full kilowatt or at 1500 watts=1.5 kwh adds up to a big bill in no time. It is not difficult to add 30- 50 dollars to the monthly bill if the unit runs most of the day.
Space heaters draw alot of current, you will notice that the cord gets warm, even hot at the plug. That same wall outlet and the wiring to your electrical pannel is subjected to the same load, and will be warm in the walls. If there are any connections that are not tight, or have had corrossion, this can lead to fires. Electric space heaters are really mean't for short term use and not as a permanent heat source.
A better, safer alternative, would be to add an inline fan for your duct to help force the warm air from your furnace into that hard to heat room. Its a bit of added work, but the unit is permanent, much cheaper to run and safer.
Space heaters draw alot of current, you will notice that the cord gets warm, even hot at the plug. That same wall outlet and the wiring to your electrical pannel is subjected to the same load, and will be warm in the walls. If there are any connections that are not tight, or have had corrossion, this can lead to fires. Electric space heaters are really mean't for short term use and not as a permanent heat source.
A better, safer alternative, would be to add an inline fan for your duct to help force the warm air from your furnace into that hard to heat room. Its a bit of added work, but the unit is permanent, much cheaper to run and safer.