A Thermostat Controller is a device that enables the precise regulation of environmental temperature by controlling cooling and/or heating devices. It is used for the automation and control of HVAC systems in commercial, industrial, and residential buildings. The Thermostat Controller serves as a monitoring system for energy usage of climate control appliances and other equipment such as fan coils, chillers, boilers, and pumps. It allows operators to remotely access and adjust settings in order to maximize energy efficiency while maintaining desired temperature levels in the environment.