Abstract: A system for allocating energy use among a plurality of heat exchange terminals each of which includes a heat exchanger and an electrically driven motor and electrical controls for controlling the operation of the motor. Each heat exchange terminal has associated therewith a uniquely address-coded monitor connected for metering the condition of the motor controls. A central control console periodically polls the monitors at each address code, and in response the polled monitor sends to the interrogating console data indicating the status of the associated motor controls. Memory is provided for accumulating the data so that at the end of a predetermined period the console can compute the proportion of total energy used by each terminal and prepare bills therefrom.