A psychrometric air properties calculator for use by HVAC engineers. EZAir calculates moist air properties without the use of a psychrometric chart. EZAir is a great tool for any HVAC professional to find: Temperatures, Dew Point, Humidities, Enthalpy, etc. And now EZAir works in both English and Metric units! Operation is very simple to navigate: simply enter 2 known values and EZAir will calculate the remaining properties.