![]() Old furnaces can be as little as 70% efficient, and newer ones can be higher than 90%. Like any other appliances that convert electricity to other forms of energy, furnaces also have various efficiency levels. Once you've done the above steps, you will see what size of furnace you need. If your room gets exposed to the sun for half the day, you can select the option neither shaded nor sunny. Choose the sunny room option if the room is facing the sun throughout the day.
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