The apparatus for measuring the COP of air-conditioning cycle is designed to measure the compressor power and evaporator heat capacity. So, the compressor power will measure using power meter and the evaporator heat capacity have to measure the inlet-outlet temperature, pressure, and mass flow rate using the flow meter. The air-conditioning cycle components in the apparatus are purchased like as YF hybrid model. And the experimental apparatus, for measuring the COP of air-conditioning cycle and estimating the reliabilities applying the nano-fluids into the cycle, were designed and made. The nano-fluids to apply the cycle were chosen as Al2O3, TiO2, and CuO. This study apply 0.05% volume fraction of Al2O3 nanoparticles.