A built-in thermostat called a limit controller prevents overheating. The furnace's heating elements activate in stages to avoid overloading the home's electrical system. If these ducts run through unheated areas, they lose some of their heat through air leakage as well as radiation and convection from the duct's surface.īlowers (large fans) in electric furnaces move air over a stack of three to seven electric resistance coils, called elements, each of which are typically rated at five kilowatts. Heated air is delivered throughout the home through supply ducts and returned to the furnace through return ducts. ![]() Electric furnaces are more expensive to operate than other electric resistance systems because of their duct heat losses and the extra energy required to distribute the heated air throughout your home (which is common for any heating system that uses ducts for distribution).
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