This paper proposes a technique for broadcasting control of Smart Air Conditioners (SACs) by implementing the Narrowband Powerline Communications (NB-PLC) technology. The Master Control Room (MCR) generates commands for SACs operation that are sent over power lines by using the communication protocol known as Smart Energy Profile 1.0 (SEP 1.0). The proposed system can also offers features like Demand Response (DR) to facilitate the Smart Grid (SG). Field measurements elucidate the performance of NB-PLC systems. Measurements are carried out by injecting and receiving the NB-PLC signal over low voltage (LV) power lines, medium voltage (MV) power lines and across transformers. A hybrid communication system, NB-PLC integrated with Optical Fiber Network (OFN), is developed for the automation of Distribution System (DS) of Lahore Electric Supply Company (LESCO). The developed system was tested for the DR program in order to support the Smart Air Conditioning system within Lahore. It is suggested that by adjusting the commercial SACs parameters, the task of energy conservation can be achieved by optimizing the peak load curves for greater efficiency. Moreover, data of various types of appliances can also be communicated to the MCR for the purpose of demand side management.