Unit reference
Scope of works:
Overview
As part of Waitrose’s decarbonisation programme, the existing roof-mounted air handling units serving the Chiswick store were refurbished to remove reliance on gas-fired heating and improve
energy efficiency.
The AHUs were structurally sound but equipped with legacy gas burners and inefficient fan assemblies that were no longer suitable for a low-carbon strategy. AHS Specialist Services were appointed to upgrade the units, enabling heat pump operation while extending the life of the existing plant.
Works Delivered
The existing gas burners were removed and replaced with new heating coils designed for heat pump-fed systems, eliminating fossil fuel heating from the AHUs.
Outdated fan assemblies were dismantled and replaced with high efficiency IE5 EC plug fans, providing accurate airflow control and reduced energy consumption. General refurbishment works included internal cleaning, damper servicing, replacement of AHU intake damper, corrosion treatment, and fitting new filters.
Result
This refurbishment delivered a future-ready, low-carbon ventilation solution while maximising the value of existing assets.
