Dewpoint Temperature: The maximum amount of water vapor that can be held by air (expressed as pounds of moisture per pound of dry air) decreases as the air becomes cooler. When a sample of air is cooled to its dewpoint temperature, the air is fully saturated with water. Assuming equilibrium conditions, any further decrease in temperature will lead to the condensation of water vapor (i.e, the formation of dew).
DX Air Conditioning: "Direct Expansion" (DX) air conditioning refers to refrigeration cycles that use a compressor to create liquid refrigerant that directly expands (i.e., evaporates) in a heat exchanger to create a cooling effect.
Latent and Sensible Cooling: The heat released when water vapor condenses--about 1060 Btu per pound of water--is referred to as the latent heat of condensation. Drying air is commonly called latent cooling, while reducing the temperature of air is called sensible cooling. People are comfortable within a building only when both the sensible and latent cooling provided by the air conditioner match the building's sensible and latent loads.