I just, ah, sweated through the purchase of a humidifier. Get one of the more expensive models with an ultrasonic diffuser, a filter, and a humidistat. The cheaper sort gobbles energy, soaks you in sweat, and needs daily cleanings to control mold. (Or else it makes so much noise it interferes with sleep). We ended up with this Venta-Sonic model and so far we like it pretty well.