Definition of Enthalpy

How Air Conditioning WorksEnthalpy is a fancy word for how temperature and humidity relate to each other. Here is what we mean: On a hot and muggy day the AC system works much harder than on a dryer day at the same given outdoor/indoor temperatures. Anyone who would expect the AC system to deliver abundant quantities of cooling energy on a hot and muggy day (example: you just got home from work in the afternoon and you expect the AC to cool the house down fast) does not understand enthalpy, and more than likely has false expectations on what a properly engineered AC system will provide.