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Home > Case Studies > Fan Coils > ESB Offices – Mechanical Upgrade Case Study ESB Offices – Mechanical Upgrade Case Study Mechanical Contractor Jones Engineering Main Contractor P.J Hegarty & Sons Consultant Building Design Partnership Architect Grafton Architects & O Mahony Pike As part of the refurbishment and modernisation of the ESB offices, a comprehensive upgrade of the building’s heating and ventilation systems was required to support improved energy performance and occupant comfort. Versatile worked closely with the project consultants and mechanical contractors to deliver an integrated mechanical solution tailored to the operational needs of the building. The scope of the project included the supply of high-performance heating equipment and modern ventilation systems designed to enhance indoor air quality while ensuring reliable and efficient operation. The project demonstrates how commercial office spaces can be successfully upgraded with modern mechanical systems that support both sustainability goals and long-term building performance. The Challenge A key element of the project involved developing a bespoke fan coil solution capable of meeting the building’s specific heating and cooling demands. Unlike traditional systems that rely on separate heating and cooling coils, this project required a more streamlined and energy-efficient approach. To achieve this, Versatile supplied fan coil units with a single coil capable of delivering both heating and cooling, reducing system complexity while maximising overall energy efficiency. This design allowed the system to operate with greater flexibility while maintaining precise temperature control throughout the office spaces. The system required the integration of a 6-port changeover valve, rather than the conventional four-pipe arrangement typically used in commercial HVAC systems. The 6-port valve enables the fan coil to switch seamlessly between heating and cooling modes, allowing the building to benefit from efficient climate control while reducing the need for additional pipework and system components. This bespoke fan coil solution ensures that the ESB offices can maintain a comfortable indoor environment year-round while supporting improved energy performance and long-term system reliability. The Solution We supplied 400 fan coil units as part of the project, providing an efficient and flexible heating and cooling solution throughout the office spaces. These units were carefully selected to meet the specific performance requirements of the building, ensuring consistent temperature control while supporting the overall energy efficiency of the system. In addition to the fan coil installation, we also supplied three door curtains, including one over-door curtain and two wing-effect door curtains. These units were specifically designed to meet the heating and air management requirements of the building’s entrance areas. By creating an effective barrier between internal and external environments, the door curtains help reduce heat loss, improve energy efficiency, and maintain a comfortable indoor climate for occupants entering and exiting the building. Together, the fan coils and door curtain solutions contribute to a fully integrated system that supports both thermal comfort and energy performance across the entire facility.