AESYS Technologies thinks it's cool to get in to hot water. The company makes commercial boilers, HVAC, and refrigeration products. AESYS operates through four main divisions to serve its worldwide client base. Its York-Shipley Global division manufactures fire-tube boiler assemblies and related boiler room equipment and pressure vessel products. Jackson & Church HVAC Global makes heating, ventilating, and air-conditioning equipment. The Custom Fabrication division provides built-to-specification manufacturing services, and its Educational Services division offers accredited hands-on training in boiler safety and welding to meet commercial and industrial certification and licensing needs.