The air-conditioning system that separated the latent heat load and the sensible heat load has attracted a great deal of attention for energy-saving system. We will design the air-handling units of outdoor air (OHU) for latent heat system. OHU can use Task/ambient air conditioning (TAG) system. TAG system are being investigated and are effective air conditioning methods for offices. In this study, subjective experiments with a TAG system were conducted to investigate thermal comfort and productivity by field measurements.