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> In the winter humidify the air for more efficient heating?

I'm rusty too, but the more mass you have, (or things that takes heat) the more energy you need to heat up. But then you have inertia. That's why people put bricks around simple wooden stove - so after the wood has burned out, those bricks still give you heat.

Why not just use a regular humidifier? Evaporative humidifiers are just a fan with a special filter that's good at absorbing water and has a very high surface area so it also evaporates quickly.

daikin had this premium residential series called ururu sarara 7 which does this. albeit with some performance upper bounds to keep costs sane. somewhat complicated setup, and i think it would be a brilliant unit if your local weather is within the designed performance envelope