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Two reasons: One, it increases efficiency by reducing heat loss to the immediate surroundings of the furnace. Two, it keeps you from burning your hands (try cutting off the insulation and touching it when it is on).

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Wiki User

16y ago
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Wiki User

12y ago

To protect the wiring from heat damage

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Raynard Larry

Lvl 2
1y ago

Fire protection

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Q: Why is an electric furnace insulated?
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