This document discusses humidity control systems for fertilizer storage. It notes that most fertilizers must be stored below 40% relative humidity to prevent caking. It describes two methods for controlling humidity and temperature in fertilizer storage: refrigeration and desiccant dehumidification. It argues that desiccant dehumidification is more economical due to lower installation costs and operating costs compared to refrigeration, which requires expensive reheat to return air to ambient temperatures. It provides a list of customers that use the company's desiccant dehumidification equipment for fertilizer storage facilities.