Trolmaster Temp/Humidity Station (HS-1)TROLMASTER TEMP HUMIDITY STATION The station is used to control dehumidifiers and works by being wired exactly like an external humidistat. Most larger commercial dehumidifiers have a low volt control option so the dehumidifier can be controlled by an external humidistat. The station eliminates the need to control the high amperage inrush current associated with dehumidifiers making it the best way to control your dehumidifiers. *Firmware Update Note: