U.S. Air Force Airman Codye Miller dismantles the electrical panel on an air conditioning unit to gain access to its compressor Aug. 18, 2010, on Joint Base Charleston, S.C. Air conditioning units require periodic maintenance to replace old parts or fix damaged ones. Airman Miller is a heating, ventilation and air condition technician with the 628th Civil Engineer Squadron. (U.S. Air Force photo/Senior Airman Timothy Taylor)

U.S. Air Force Airman Codye Miller and Craig Collins detach a damaged compressor to make room for a new one Aug. 18, 2010, on Joint Base Charleston, S.C. The compressor aids in transferring vaporized coolant to a liquid form. The compressed vapor is cooled via heat exchange with the outside air, wherein the vapor condenses to a fluid. Airman Miller and Mr. Collins are heating, ventilation and air conditioning technicians with the 628th Civil Engineer Squadron. (U.S. Air Force photo/Senior Airman Timothy Taylor)

Craig Collins brazes a filter drier into place using an acetylene torch Aug. 18, 2010, on Joint Base Charleston, S.C. Filter driers help eliminate moisture, acids and debris from the cooling system. Mr. Collins is a heating, ventilation and air conditioning technician with the 628th Civil Engineer Squadron. (U.S. Air Force photo/Senior Airman Timothy Taylor)

U.S. Air Force Airman Codye Miller and Craig Collins charge an air conditioning unit with nitrogen to 300 pounds per square inch to check for leaks Aug. 18, 2010, on Joint Base Charleston, S.C. Once the copper lines are filled with nitrogen, soapy water is sprayed on the brazed areas to check for leaks. Airman Miller and Mr. Collins are heating, ventilation and air conditioning technicians with the 628th Civil Engineer Squadron. (U.S. Air Force photo/Senior Airman Timothy Taylor)

Craig Collins holds the condenser fan while U.S. Air Force Airman Codye Miller reconnects electrical wires Aug. 18, 2010, on Joint Base Charleston, S.C. Once all repairs are complete, technicians reassemble the unit, allow coolant to charge back to full capacity and run a test to ensure the job was a success. Airman Miller and Mr. Collins are heating, ventilation and air conditioning technicians with the 628th Civil Engineer Squadron. (U.S. Air Force photo/Senior Airman Timothy Taylor)