The idea of writing a book on Managing of Humidity came from my friend Mr. Ananth Harnahalli. I hesitated first, as I was only a Textile Technologist and not a Humidification Engineer. Mr. Ananth reminded me that I had faced lot of problems due to improper maintenance of humidity while working on the shop floor and had struggled a lot to get correct conditions. The problems faced were always unique as the systems were getting changed, materials were getting changed and also the working conditions. Mr. Ananth told that the purpose of this book should be to guide the shop floor technicians and engineers in maintaining required conditions and to act in advance. They need the basic concepts and the choice available in the market to update their humidification plants, hence this book.