In this research, the experiments to measure the actual performance of room air-conditioners were performed to make appropriate evaluation method of them. Results are as follows: 1. Partial load rates of air-conditioners are very low: especially in the heating use there was a machine whose partial load rates are less than 10 % in 95% of the entire operating hours. 2. COP in actual usage situation was lower than JIS experiment result in most of machines. This tendency was conspicuously appeared in heating. 3. The evaluation approach that can evaluate the actual performance at the heating period and at the low partial load appropriately should be considered.
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