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Multilayer coating structure comprising a copper (Cu) layer sandwiched between titanium dioxide (TiO₂) were demonstrated as a transparent heat reflecting (THR) coating on glass for energy-saving window application. The main highlight is the utilization of Cu, a low-cost material, in-lieu of silver which is widely used in current commercial heat reflecting coating on glass. Color tunable transparent heat reflecting coating was realized through the design of multilayer structure and process optimization. The impact of thermal treatment on the overall performance of sputter deposited TiO₂/Cu/TiO₂ multilayer thin film on glass substrate is investigated in detail. Significant enhancement of transmittance in the visible range and reflectance in the infra-red (IR) region has been observed after thermal treatment of TiO₂/Cu/TiO₂ multilayer thin film at 500 °C due to the improvement of crystal quality of TiO₂. Highest visible …