T: 01425 475 384
E: sales@ahs-ss.uk.com
AHS Specialist Services
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Specialist AHU refurbishment across critical environments

From hospitals and retail stores to secure government estates, AHS delivers air handling unit refurbishment and upgrade solutions that improve performance, reduce energy consumption, and extend asset life with minimal disruption.

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Our Sectors

We deliver refurbishment and upgrade solutions for AHUs within hospitals and clinical environments, working in live areas where system downtime, access and compliance are critical. Our approach focuses on improving performance, compliancy and supporting decarbonisation, while maintaining continuity of service.

Key Challenges We Address
  • HTM compliance improvement within existing AHU casework
  • Minimising disruption to critical services and wards where possible
  • Limited access and complex plantroom constraints
Typical Scope of Works
  • AHU condition and performance surveys
  • HTM compliance improvement upgrades
  • EC fan upgrades with energy validation
  • Heating and frost coil replacement or upgrade to lower temperatures
  • Small works, repairs and ongoing maintenance support
Case Study
London Hospital Day Theatres

We delivered a full HTM refurbishment of AHUs serving live theatre environments, where full replacement was not feasible due to space constraints and downtime implications.

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Keep Critical Healthcare Environments Running

Specialist AHU upgrades delivered safely within live hospitals, with minimal disruption to patient care.

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We deliver refurbishment, upgrade, and decarbonisation solutions for AHUs serving retail environments, helping clients reduce operational costs, improve energy efficiency, and extend equipment life expectancy while minimising disruption to trading hours and customers.

Key Challenges We Address
  • Minimising disruption within live trading environments
  • Improving energy efficiency and supporting decarbonisation targets
  • Extending the life of existing AHUs and reducing capital replacement costs 
Typical Scope of Works
  • AHU condition and performance surveys
  • EC fan upgrades with energy validation
  • Heating and cooling coil upgrades including heat pump conversions
  • Damper, filter, and casework refurbishment works
  • Estate-wide refurbishment and lifecycle upgrade projects 
Case Study
Waitrose Chiswick – Decarbonisation

We refurbished existing roof-mounted AHUs as part of Waitrose’s decarbonisation programme, removing gas-fired heating and upgrading the systems with heat pump-compatible coils and high-efficiency IE5 EC plug fans.

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Keep Retail Environments Running

Specialist AHU upgrades delivered safely within live retail environments.

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We deliver refurbishment, upgrade, and decarbonisation solutions for AHUs serving commercial office environments, helping clients improve ventilation performance, occupant comfort, and system reliability while minimising disruption to tenants and day-to-day building operations.

Key Challenges We Address
  • Completing works within restricted shutdown periods
  • Maintaining occupant comfort and operational continuity
  • Improving resilience, reliability, and ventilation performance 
Typical Scope of Works
  • AHU condition and performance surveys
  • EC fan upgrades and fan wall conversions
  • Heating and cooling coil upgrades including heat pump conversions  
  • Resilience and redundancy improvements for critical systems 
Case Study
Canary Wharf – EC Fan Wall Upgrade

We upgraded a critical perimeter AHU serving a large commercial office building at Canary Wharf, replacing ageing fan assemblies with a new EC fan wall system to improve efficiency, reliability, and redundancy.

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Keep Commercial Office Environments Running

Specialist AHU upgrades delivered safely within occupied commercial buildings.

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We deliver maintenance, reactive repairs, refurbishment, and decarbonisation solutions for AHUs serving schools, colleges, and universities, helping clients improve system reliability, energy efficiency, and ventilation performance while planning works around academic schedules and holiday shutdowns.

Key Challenges We Address
  • Completing projects during school and university holiday periods
  • Maintaining reliable ventilation within occupied teaching environments
  • Improving energy efficiency and supporting decarbonisation objectives 
Typical Scope of Works
  • Planned AHU maintenance and condition surveys
  • Reactive repair and emergency breakdown support
  • EC fan upgrades and energy-efficiency improvements
  • Heating and cooling coil replacements and refurbishment works
  • Decarbonisation and lifecycle upgrade projects during holiday shutdowns 
Keep Critical Education Environments Running

Specialist AHU upgrades delivered safely within occupied education environments.

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We deliver practical decarbonisation solutions for existing AHUs, helping clients reduce carbon emissions, improve energy efficiency, and extend equipment life expectancy without the cost and disruption of full plant replacement.

Key Challenges We Address
  • Removing reliance on gas-fired heating systems
  • Improving energy efficiency and reducing operational carbon
  • Delivering decarbonisation upgrades within existing AHU constraints 
Typical Scope of Works
  • Removal of gas burners and associated heating systems
  • Heating coil replacements designed for lower-temperature systems
  • EC fan upgrades with energy validation and reduced power consumption
  • Refurbishment works to extend AHU operational life expectancy
Case Study
Waitrose Chiswick – Decarbonisation

We refurbished existing roof-mounted AHUs as part of Waitrose’s decarbonisation programme, removing gas-fired heating and upgrading the systems with heat pump-compatible coils and high-efficiency IE5 EC plug fans.

Read more
Keep Net Zero Environments Running

Specialist AHU upgrades supporting net zero and decarbonisation projects.

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Working in Live Environments

Many of the buildings we work within operate continuoursly and cannot tolerate disruption. Our engineers specialise in carrying out refurbishment and upgrade works within live environments, coordinating closely with estates teams and contractors to ensure works are completed safely and efficiently.

  • Live environment installation
  • Minimal shutdown requirements
  • Compliance-focused upgrades
  • Energy reduction strategies
Waitrose
Chiswick

AHU upgrades and fan upgrade supporting decbercination gears

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Canary Wharf:
EC Fan Wall Upgrade

We upgraded a critical perimeter AHU at Canary Wharf.

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Commercial
Office Building

EC fan upgrade reducing energy consumption by 39%

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Trusted by leading organisations

Our Featured Case Studies

Canary Wharf –
EC Fan Wall Upgrade

Due to the operational requirements of the building, the works were completed within a restricted shutdown window over a single weekend.
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Our Featured Case Studies

London Hospital Day Theatres

We delivered a full HTM refurbishment of AHUs serving live theatre environments, where full replacement was not feasible due to space constraints and downtime implications.  
Learn more

Latest News and Information

Introducing the new generation of gas burners, energy efficient
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AHU Refurbishment vs Flat-pack Replacement
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Planning an AHU Upgrade or Refurbishment Project?

Our specialist team can help improve the performance, reliability, and efficiency of existing ventilation systems with practical refurbishment and upgrade solutions tailored to operational requirements.
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