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I’m not well-versed on this topic, but doesn’t the AC frequency cause alternating fields in the heating element, making it vibrate slightly? If that’s correct, then you’re losing an incredibly stupidly tiny amount of energy as sound too.
And that satisfying glow is losses as light, which will do some heating, but not as efficiently
There’s a whole class of electric heater that do this intentionally. Radiant heaters are awesome for outdoor patios and other spaces like uninsulated garages where you care more about heating surfaces than the air itself.
Unless it is visible to the window at which point the light escapes and doesn’t heat your house 100% efficiently
Also a question of optimizing its use
