- Direct digital control systems - Microprocessor-based systems
- Economizers - Heat recovery systems
- Variable Frequency drives - Carbon monoxide sensors
- Carbon dioxide sensors - Infrared sensors
- Pneumatic controls systems - Zone controls
- Solid state electronic systems - Variable volume systems
- Boiler system and hot water - Make up air units
- Gas and oil fired - Radiant heat
- Cascade temperature systems - Dry cleaning machines
- Freeze dryers - Heat transfer equipment
- Air Dryers - Walk-in cloolers and freezers
- Computer rooms - Chillers
- Environmental / clean rooms - Air/water cooled equipment
- Heat pumps - Split system and package units
- Centrifugal compressors - Reciprocating compressors