Usually enamels dry slow enough that moisture condensing on surface is not too big a problem. I do find sometimes enamels dry a bit slower in high humidity. Lacquers, on the other hand, suffer from what is called "blushing", where the rapid drying lowers surface temp of paint and a whitish, rough area results from condensed water.
Lower temps also retard drying of enamels. I use Testors enamels primarily, so I built a drying cabinet, using a 40W light bulb in lower chamber, one of those translucent storage containers as the upper chamber (where the model or parts go). I find it runs at about 105F, and really speeds up drying, reduces humidity and is a dust-free environment. Dries quite well in about 12 to 18 hours for an airbrushed coat.