Heat from Hooves..?

I'm curious. I know heat is bad.. But my mare's hooves have all had heat ever since I can remember (6+ years) but they're all the same temperature. I've asked vets and farriers about it, and they said since they're all the same temperature that it's fine.
Does anyone else have a horse like this?

If they're burning up, or one foot/area is much hotter than the rest, then I'd be concerned n want to check out other symptoms. But horses have(well, should have) good circulation through their feet and are warm blooded, so there should be some warmth from the hooves in most situations
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