Daikin Ireland’s cutting‑edge VRV 5 climate control system is at the heart of the recently retrofitted headquarters of John Sisk & Son in Citywest Business Campus, delivering exceptional energy efficiency, comfort and sustainability credentials for Ireland’s leading building contractor.
Sisk’s decision to retrofit an existing building – rather than construct a new one – was a deliberate showcase of its sustainability ethos. The transformation, carried out by over 150 Sisk staff and supply chain partners, boosted the building’s BER from D2 to A3, with Daikin’s VRV 5 system playing a pivotal role in achieving that leap.
“The heating and cooling of the building was a very important consideration in terms of offering a more comfortable working environment for staff and clients alike,” said Tom Grant, Director of Assets and Internal Services, Sisk. “From a sustainability point of view, the Daikin VRV was a good solution for us.”
Specified by design consultants Axiseng, the VRV 5 was chosen for its low‑carbon, high‑efficiency performance and flexibility. “One of the main considerations was the need for a solution that would help us achieve an A rating,” explained Richard Vaughan, Senior Associate at Axiseng. “We also needed a heat recovery solution for one of the spaces in the building and the VRV 5 offers that flexibility.”
Daikin Ireland’s DX Manager Liam Kirwan highlighted the system’s environmental advantages: “By moving to R‑32 refrigerant, we’re reducing CO2 levels and enhancing the building’s energy performance, all while providing a comfortable environment for staff. The VRV 5 is the gold standard of the air‑conditioning industry.”
Installation was carried out by trusted Daikin partner Kelly RAC, whose Technical Sales Manager Gavin O’Reilly praised the system’s adaptability: “With this building, you have all different orientations – south‑facing spaces needing cooling and north‑facing offices needing heating – and the VRV 5 can run both simultaneously on the same system. For us, it’s the best air‑conditioning system on the market today in terms of quality, performance, efficiency and controllability.”
For the 200‑plus occupants of Sisk’s HQ, the result is a comfortable, future‑proofed workplace that reflects the company’s brand and values. As Tom Grant concluded: “It’s important to have a headquarters that really demonstrates the brand and shows the industry what we can deliver. It meets all our needs.”
