The SMSCOM are known for there high quality environment controllers (Fan speed Controller). SMSCOM have a good range of products which consist of the single fan controller unit, twin fan controller units, SMS Hybrid Controller and many more. You can even upgrade to the pro controller. These controllers have added features such as added humidity prong so they can control humidity levels. If noise and buzzing of fans are a problem then Grow It Yourself highly recommend using the SMSCom 4-Amp Hybrid Twin Fan Speed Temp Controller
. These SMSCOM Hybrids will eliminate the buzzing of fans and control the temperatures and humidity of the grow room.