Arup HQ switches to heat pumps
16th December 2025
UK: Consultant Arup has significantly reduced the carbon footprint at its London headquarters by replacing gas boilers and R134a chillers with air-source heat pumps.
The £3.1m scheme at the company’s 1,3740m2 offices at 8 Fitzroy Street is seen as a key step in Arup’s commitment to achieving net zero across its global estate.
Acting as principal contractor, the global energy services company Dalkia delivered the Arup design validation, detailed coordination, fabrication, installation, and commissioning of new low-carbon heating and cooling systems, all while maintaining business as usual throughout the building.
The £3.1 million scheme marks a key step in Arup’s commitment to achieving net zero across its global estate. Acting as Principal Contractor, Dalkia delivered the Arup design validation, detailed coordination, fabrication, installation, and commissioning of new low-carbon heating and cooling systems, all while maintaining business as usual throughout the building.
The two existing gas boilers and two chillers were replaced with air-source heat pumps using lower GWP refrigerant R513A. In addition, the domestic hot-water generation system was upgraded from gas-fired water heaters to four CO2-based heat pumps.
Together, these upgrades are expected to cut annual carbon emissions by approximately 250 tonnes of CO2.
Working collaboratively from design through delivery, Dalkia and Arup ensured that critical services remained operational throughout the project. Out-of-hours working, prefabricated pipework, and careful sequencing enabled the decarbonisation works to be undertaken safely and efficiently within the live office environment.
