You don’t have to breathe in hot bath or shower water. The air is still decent.
But take a hot shower with the fan off and the room sealed up, the weather will get pretty bad in there.
Conversely, if you stand outside in 95F degree heat, but wear a rebreather with a hose going inside to 65F degree AC, or just stick your face inside, you feel pretty good!
TL:DR – a lot of the misery from heat comes from breathing it.
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