Electric heating has near 100% efficiency regardless how you use it[0]. Heating with furnace is less efficient since some of the heat escapes through the chimne

Electric heating has near 100% efficiency regardless how you use it[0]. Heating with furnace is less efficient since some of the heat escapes through the chimney directly and efficiency is typically disproportional to the heating power so it's better to heat constantly[1]. [0] https://en.wikipedia.org/wiki/Electric_heating#Environmental_and_efficiency_aspects https://en.wikipedia.org/wiki/Electric_heating#Environmental... [1] experience