It was developed temperature comfortable indoor air quality controller controlled ventilation according to cooling load, heating load and CO2 concentration in the time of cooling and heating of building. The application of controller was programed by neuron C, in order to increase field tailorability of the controller was manufactured to module type that can be applied to RS422, power line and Zigbee com- munication without reference to the filed network environment. The controller reduced waste energy by controlling ventilation and analyzing temperature, humidity and CO2 concentration, the communication traffic was decreased by multicast type of the controller.