IES Callenberg Ltd, formerly known as Integrated Engineering Services (Aberdeen) Ltd was established by the original owners in 1984 and have been successfully delivering this Scope of Service to the Oil & Gas industry. With over 30 years’ experience in the provision of HVAC and refrigeration repair, maintenance and engineering services, we are the largest independent provider of HVAC&R services in the North Sea. Our client portfolio includes major oil and gas operators, including: Shell, BP, CNOOC, EnQuest, Respol Sinopec Resources Ltd, Serica Energy, ENI and many others. We currently employ around 100 core staff and have a full complement of highly experienced HVAC Consultants, Design Engineers, Computer Aided Design (CAD) Operators, Project Engineers, Maintenance Engineers and Technicians, HSEQ experts, Refrigeration Engineers, Modular Door Technicians and Support Staff. Although we primarily specialise in the oil and gas industry, we have also secured contracts in the renewable markets and therefore service many of our ‘green’ clients’ on and offshore sub-stations. In 2016 IES was acquired by Trident Maritime Systems, a US based company who serve the cruise, military, energy and commercial sectors. Trident specialise in the design, engineering, testing and installation of (but not limited to) HVAC and refrigeration systems, integrated power systems, cryogenic insulation, fire suppression, and the general outfitting of cruise liners, military vessels, topside living quarters on offshore installations, mobile rigs, floating production storage and offloading (FPSOs), and offshore supply vessels.