to power the fan 24 alone to circulate air to and from the control region in some applications the controller 26 may dictate a variable air flow rate created by the fan 24 based on feedback signals while operating in the first mode the circulation of the air may reduce or prevent the formation of regional thermal hotspots within the control region the speed and extent to which the air circulation will eliminate the regional hotspots will depend upon factors including the volumetric flowrate of the fan 24 the configuration of objects within the control region the size of the control region etc once an effective flow rate of air is circulated the sensors 40 are apt to determine temperature values that are more representative of the average temperature within the control region as opposed to a disparate regional temperature values consequently it may be possible to reduce or eliminate associated sensor priming periods in the first mode the refrigeration unit 10 can be operated for a period of time without running the motor 32 and generator 34 of the power package 14 consequently whatever fuel would have been consumed by the motor 32 is saved what constitutes a u201c low load u201d condition can be determined for the.