Faran Humidifiers - HR-50 HumidfierOverview Trying to raise humidity inside the grow room can be a difficult job. Commonly available small scale humidifiers often prove too small to increase humidity to a satisfactory level. These humidifiers are the only units capable of doing the job effectively and consistently. With a choice of a basic Analogue Humidistat or a more advanced Digital Humidistat that will also control a heater, you will have full control of this important factor.