Keywords: A/C, AC, AIR CONDITIONING ,HVAC , FREON, SUVA, R11, R22, R-11, R-22, CENTRIFUGAL, RECIPROCATING, CHILLERS, DIRECT EXPANSION, JOHNSON CONTROLS, DIRECT, DIGITAL, CONTROLS, HOUSTON, AUTOMATION, DDC, PNEUMATIC, ELECTRONIC, COMPUTER, COMPUTERIZED, JOHNSON CONTROLS, STAEFA, HONEYWELL