EZAir Properties - Version 1.10 A psychrometric air properties calculator for use by HVAC engineers. EZAir calculates moist air properties without the use of a psychrometric chart. The EZAir program calculates: Dry Bulb, Wet Bulb & Dew Point Temperatures, Humidity, Enthalpy, etc. And works in both English and Metric units! Simply enter 2 known values and EZAir will calculate the remaining properties.