TOT Public Company Limited (Thailand) is a state enterprise, telecommunications, and is considered a national telephone company's Thailand operations and communications are processed from the Telephone Organization of Thailand, which was founded in 2497, continues today. a state enterprise under the Ministry of Information and Communications Technology TOT Public Company Limited () with multiple agencies and the agencies I work is the Social Action Center equipments are and Cold Shower is a unit of work. the maintenance of the engine and the air regulator Certified. In this project, the agency wants to change the air conditioning of the loop body is cooled so our agency then has to be changed just because the air conditioning unit. We spent the last 10 years, and maintenance you have to spend a lot to repair.