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A fan or cooler relay is used in electric furnace to change the blower speed for cooling?

No, a fan or cooler relay is not used in an electric furnace to change the blower speed for cooling. In an electric furnace, the blower motor operates at a constant speed. The cooling function in an electric furnace is typically controlled by a thermostat or temperature sensor that switches the heating elements on and off as needed to maintain the desired temperature.
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