Abstract: A temperature control system and a method of controlling air conditioning in a multi-zone structure are disclosed. The temperature control system includes a forced-air primary conditioning unit including an air return duct, an air supply duct, and a circulator. The temperature control system also includes a secondary combustion heat source that operates independently of the forced-air primary conditioning unit, a smart circulator thermostat, and a remote temperature sensor. The at least one memory device includes executable instructions that when executed by the at least one processor cause the processor to receive a temperature value representative of a temperature of the structure, receive an indication of an operation of the secondary combustion heat source, generate a circulator operation signal based on a comparison of the received temperature value to a selectable temperature setpoint, and the received indication of an operation of an independent secondary combustion heat source.