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In the winter I always leave my tub full and the bathroom door open after taking a hot bath to allow more of the heat to warm my home.

I paid to heat that water up, so I damn well want to get as much out of it as I can.

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Sounds like a great way to encourage mould growth

In winter climates it’s extremely common to run humidifiers to add water to the air. Using a bathtub for the same purpose is pretty common and I’ve never heard of either causing mold in normal operations.

Yeah, given how dry our place gets in winter the added humidity is not a problem.

If I took baths every day then it might become a problem but once a week or so had had no negative effects.

Humidity is usually too low during cold months, so leaving the door open is fine and helps everyone feel warmer (humidity + a bit of extra heat).

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