The bulb/fixture and air surrounding the bulb are part of the house, so they are heating the house. It's not like that heat stays around the bulb, physics demands it flows away to cooler areas.
If the bulb was off, the furnace would have to heat that area of air and fixture; there are no arbitrary zones of warm and cold.
100% of the energy goes towards heating your house; if it doesn't, where else does it go?
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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