If you ask a professional brewer the most important step in brewing almost all will answer with "fermentation temperature control". The TC-100 is Spike Brewing's solution to this critical brewing step! Their TC-100 package will easily hold your fermentation temps exactly where you want; even in the hottest garage or coldest basement. Our dual stage temp controller allows you to set your desired temperature and then maintains that temp with a cooling coil and heating unit. When your conical's temperature deviates from your set temp either the cooling pump or heater will turn on to bring your wort back to your desired temperature.