This study investigated the task of optimum control of an air-conditioning system. This system could predict personal thermal comfort, and could provide moderately conditioned air close to the vicinity area of occupants. Each occupant could therefore be provided with moderate air velocity and temperature around them, according to their preferences. Subjective experiments were conducted in an environmental chamber with a single/flow air conditioning system mounted on the ceiling. The air conditioning system could operate as a task/conditioning system for occupants. In the experiment, thermal comfort votes, comfort sensation votes, and detail of clothing climate which means temperature and humidity between clothes and the skin were measured. The model also explores the correlation between clothing climate and thermal sensation that was proposed on the basis of the results of subjective experiments. From this result, it was found that there was indeed statistical correlation between clothing climate and thermal sensation.