Fundamentally, air conditioning (and refrigeration) is merely the transport of heat from a lower temperature region to a higher temperature region - the opposite of heat's natural direction of flow.

Heat vs. Temperature
The Vapor Air Conditioning Cycle
Refrigerant Behavior
Practical System Considerations
Compressor Lubrication
Condenser Operation: Refrigerant Subcooling
Dealing with Contamination: The Filter/Dryer
Refrigerant Charge Level
The Thermal Expansion Valve: Superheat
Evaporator Operation: Lubricant Return
Temperature and Capacity Control: Intermittent Compressor Operation
RAC Systems: Superior to Conventional Air Conditioners
 

Appendix I: A Refrigerant Charging Level Checking Procedure
Appendix II: Bus Compressor Mount Kit Form Sheet
Appendix III: A Glossary of Air Conditioning and Refrigeration Terms

Recommended Performance Based Specifications