Approximately 1 lb of R-134A refrigerant was charged to the previously evacuated system and with the engine running until the high side/low side pressures reached about 200/30 psig. Ambient conditions at the time of the test were 83.5 F and 75% RH. An Omega Engineering RH85 handle hygrometer was used for the measurements. With the compressor engaged and evaporator fan speed at medium, the following results were obtained: