A chiller unit comprising: a housing including an insulated cavity configured to store comestible items, a door coupled with the housing, the door being movable between a closed orientation for sealing the cavity and an open orientation for accessing or disposing comestible items in the cavity, a vapor cycle system disposed in the housing for chilling comestible items in the cavity, the vapor cycle system including a DC compressor motor, a brushless DC condenser fan motor, a brushless DC evaporator fan motor and a plurality of sensors configured to output operating parameter data relative to the cavity and the vapor cycle system, a motor control module disposed in the housing, the motor control module being in communication with the DC compressor motor, the DC condenser fan motor and the DC evaporator fan motor; and a processing module disposed in the housing, the processing module being in communication with the plurality of sensors and the motor control module, wherein the processing module, according to the operating parameter data, outputs control signals to the motor control module for independently driving the DC compressor motor, the DC condenser fan motor and the DC evaporator fan motor, characterised in that the DC compressor motor is a brushless DC compressor motor, and the chiller unit is adapted for connection to a wild frequency avionic power supply in which the AC frequency of the power supply varies according to aircraft engine speed, the chiller unit being for use as an avionic galley chiller unit and further including a power module disposed in the housing, the power module including an electromagnetic interference filter, a safety relay, a polyphase transformer, a pulse rectifier, a first DC power transformer, a second DC power transformer and a power switch and being configured to convert a wild frequency AC input voltage to at least one DC output voltage. a housing including an insulated cavity configured to store comestible items, a door coupled with the housing, the door being movable between a closed orientation for sealing the cavity and an open orientation for accessing or disposing comestible items in the cavity, a vapor cycle system disposed in the housing for chilling comestible items in the cavity, the vapor cycle system including a DC compressor motor, a brushless DC condenser fan motor, a brushless DC evaporator fan motor and a plurality of sensors configured to output operating parameter data relative to the cavity and the vapor cycle system, a motor control module disposed in the housing, the motor control module being in communication with the DC compressor motor, the DC condenser fan motor and the DC evaporator fan motor; and a processing module disposed in the housing, the processing module being in communication with the plurality of sensors and the motor control module, wherein the processing module, according to the operating parameter data, outputs control signals to the motor control module for independently driving the DC compressor motor, the DC condenser fan motor and the DC evaporator fan motor, characterised in that the DC compressor motor is a brushless DC compressor motor, and the chiller unit is adapted for connection to a wild frequency avionic power supply in which the AC frequency of the power supply varies according to aircraft engine speed, the chiller unit being for use as an avionic galley chiller unit and further including a power module disposed in the housing, the power module including an electromagnetic interference filter, a safety relay, a polyphase transformer, a pulse rectifier, a first DC power transformer, a second DC power transformer and a power switch and being configured to convert a wild frequency AC input voltage to at least one DC output voltage.