What is the definition of a PTAC smart thermostat? A PTAC smart thermostat is a modern and efficient way of controlling the temperature in a room. This type of thermostat is designed to be used with a Packaged Terminal Air Conditioner (PTAC) unit and is able to manage, monitor and optimize the temperature of a space all while providing the user with greater control, improved energy efficiency and lower energy costs. In addition to being able to monitor and control the temperature of a room, the PTAC smart thermostat also offers advanced features such as the ability to program the temperature to meet the needs of different times of day or week, as well as the ability to connect to Wi-Fi and be controlled from a mobile device. This allows users to adjust the temperature from any location at any time. PTAC smart thermostats also feature motion sensors that detect occupancy of the room and react accordingly by adjusting temperatures accordingly, as well as other features such as