Indonesia is a tropical country with relatively warm temperatures, so it is necessary to use air conditioning in daily activities. The use of the air conditioner causes the large use of electricity. This prompted the government to intervene by issuing the Minister of Energy and Mineral Resources Regulation No. 57 of 2017 regarding the provisions for labeling energy from air conditioning units that are marketed in general. To test the air conditioner unit requires a room called a psychrometric chamber which is an isolation room where the temperature and humidity can be controlled. Before use, the psychrometric chamber is needed to be tested first by analyzing the air loop using CFD, ensure the installation design is completed, and compare between the ideal condition (CFD) and actual condition (on the field). In this case, the object used is Universitas Indonesia's indoor side of the psychrometric chamber, air conditioner 18,000 Btu/h split type, and other supporting components. The method used is air enthalpy based on SNI ISO 5151 regulation by measuring, modeling, installing, simulating, and compare temperature and air velocity data between CFD as ideal condition and actual psychrometric chamber. The result shows that the temperature difference at the AHU inlet is 4.7 ℃, the AC inlet is 2.9 ℃, the air velocity difference at the AHU inlet is 2.8 m/s, AC inlet is 2.6 m/s, and indoor air loop systems side installation is completed.