This paper describes the cycle performance of heat-pump system using R-22 and R-290. Experi-ments were performed in the smooth tube with inside diameter of 10.07mm and outside diameter of 12.07 mm and grooved inner tube having 75 fins with a height of 0.25mm Condensing temper-atures were held constantly between 318K and 328 K while evaporating temperatures were var-ied from 257 K to 288 K mass velocities from 51 to $280 kg/m^2s.$ From the experiments it was known that the evaporating temperature and condensing tempera-ture had moer affected by the compressor shaft power than the tube geometries. Cooling capacity of the R-22 and R-290 had similar values in the smooth and grooved inner tubes. The coefficient of per-formance(COP) was calculated using the compressor shaft power volumetric refrigeration capacity compression ratio and cooling capacity. The COP of the R-290 had slightly higher values than that of R-22 The major parameters affecting the heat pump cycle performance wee the refrigerant proper-ties and operating conditions rather than the geometric shapes of the heat exchanger