Abstract: A system and method for controlling a refrigeration unit of an air conditioning system operating in connection with a given building environment so as to establish conditions providing a desired comfort level within the building environment, the system and method being arranged to detect the output of the refrigeration unit, to detect changes in interior or exterior conditions which will affect the comfort level in the building environment and to provide at least one control signal in response to the detected output and conditions for operating the refrigeration unit, the control signal being compensated for the predetermined dynamic characteristics of the particular refrigeration unit and the predetermined dynamic characteristics of the particular building environment such that the control signal will anticipate further change in the conditions within the building environment and will operate the refrigeration unit so as to counter the anticipated further change and tend to maintain the desired comfort level