modenacart, air doesn't "hold" moisture at all. Water vapor can exist, regardless of the presence of air. But yes, more water can exist as vapor in higher temperatures. Don't forget, though, that we're talking about boiling water (HOT), not water at ambient temperatures, and evaporation depends SOLELY on the temperature of the liquid, not the temperature of the air; and with the lower partial pressure of water vapor at lower temperatures, there would be less recondensing on the surface, making me think that boil off would be higher. Now when that water vapor cools to ambient temperatures, a lot of it will recondense, but who knows where that will be. Very little of it in the pot, I'm sure.