I use a humidifier controled by a humidistat made by Ranco. You dial the humidistat to the humidity you want and it turns humidifier on and off. It works better with the cheaper analog or on off humidifiers as opposed to a digitally controled humidifier (which is better cause their cheaper). I live in Desert conditions much of the year and it keeps my snake room perfect. I use a 5 gallon humidifier from Sears. I had problems in the past of mold buliding up if you rum humidifier alone. Even the ones that say they have humidity controls arent very accurate.