These are some of the major machinery and equipment used in HVAC systems within the oil and gas industry. Each plays a crucial role in maintaining safe and comfortable working environments and supporting various processes in oil and gas facilities. 

• Chillers: Chillers are used to cool water or other fluids for air conditioning or process cooling purposes in oil and gas facilities.
• Boilers: Boilers generate steam or hot water for heating, power generation, or other industrial processes in oil and gas plants.
• Heat Exchangers: Heat exchangers transfer heat between two fluids, such as air and water or oil, and are vital for various processes, including heating and cooling. 
• Cooling Towers: Cooling towers are used to remove heat from water-cooled systems in oil and gas refineries and petrochemical plants.
• Air Handling Units (AHUs): AHUs regulate and circulate air as part of the HVAC system, controlling temperature, humidity, and air quality.
• Ventilation Fans: Ventilation fans are essential for maintaining proper air circulation and removing contaminants in oil and gas facilities.
• Ductwork: Ductwork distributes conditioned air throughout buildings and industrial facilities, ensuring proper airflow and ventilation.
• HVAC Control Systems: Control systems regulate and monitor HVAC equipment to maintain optimal conditions efficiently.
• Compressors: Compressors are used in refrigeration systems for air conditioning and cooling applications in oil and gas facilities.
• Filters: Filters remove contaminants and particulates from the air to maintain the indoor air quality in oil and gas facilities.