Enter the dry-bulb temperature and one more property: relative humidity, wet-bulb or dew-point temperature. It gives all the moist-air properties: humidity ratio, enthalpy, dew point, wet bulb, RH, specific volume and density. You can add several points and see them on the chart.
Lower air pressure at altitude changes the humidity ratio and enthalpy for the same dry and wet bulb. At sea level you can leave the altitude at 0.
Cooling Load · FAHU Capacity · Condensate Drain Flow · Psychrometrics guide
Results are for preliminary design. Verify final selections against project specifications, applicable codes and manufacturer data.