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E: sales@ahs-ss.uk.com
AHS Specialist Services
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Air Handling Unit Refurbishment and Energy Upgrade Specialists

Extend the life of existing AHUs, reduce energy consumption, and support decarbonisation - without the disruption and cost of full replacement.

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Bespoke AHU Refurbishment and Upgrade Solutions

At AHS Specialist Services, we specialise in refurbishing and upgrading existing air handling units to improve performance, efficiency, and reliability while extending asset life. Rather than defaulting to full replacement, we focus on maximising the value of existing plant through targeted upgrades and intelligent refurbishment strategies.

Our engineers work closely with clients to assess the condition, performance, and operational constraints of their existing venulation systems. This enables us to develop practical upgrade solutions that reduce energy use, improve reliability, and minimise disruption to a building operations, and more.

AHU Refurbishment

Our Specialist AHU Services

Our refurbishment programmes are designed to restore performance, improve energy efficiency, and support decarbonisation objectives while avoiding the cost and disruption of full AHU replacement. By upgrading key components and addressing age-related deterioration, we help clients maximise the value of existing assets and defer capital expenditure.

Key Challenges We Address
  • Ageing AHUs approaching the end of their design life
  • Minimising disruption within occupied and critical environments
  • Decarbonisation requirements without full plant replacement
Typical Scope of Works
  • AHU condition, dilapidation, and performance surveys
  • EC fan upgrades with energy validation
  • Gas burner removal and low-temperature heating conversions
  • Heating, cooling, and frost coil replacements
  • Damper, controls, and filtration upgrades
  • Corrosion treatment, casework repairs, and life extension works
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Case Study
Waitrose Chiswick – AHU Decarbonisation Programme

As part of Waitrose's decarbonisation strategy, existing roof-mounted AHUs were refurbished to remove gas-fired heating and improve overall energy performance. The project included new heat pump-compatible heating coils, IE5 EC plug fan upgrades, and refurbishment works to extend the operational life of the existing equipment while supporting long-term carbon reduction targets.

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Unlock the Potential of Your Existing AHUs

Refurbishment and decarbonisation can deliver significant energy savings, reduce carbon emissions, and extend equipment life without the cost of full replacement.

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We deliver EC fan upgrade solutions designed to improve energy efficiency, enhance system reliability, and extend the operational life of existing AHUs. From individual fan replacements to complete fan wall conversions, we help clients modernise ageing ventilation systems while minimising disruption to building operations.

Key Challenges We Address
  • High energy consumption from ageing fan systems
  • Restricted access to existing AHUs and plantrooms
  • Delivering upgrades within occupied and operational environments
Typical Scope of Works
  • AHU fan condition and performance surveys
  • EC plug fan upgrades with energy validation
  • Fan wall conversions for improved resilience and redundancy
  • Motor, inverter, and controls upgrades
  • Airflow verification and post-installation performance testing 
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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 resilience. The upgrade was completed within a restricted shutdown window, allowing the client to maintain building operations while significantly improving the long-term performance of the ventilation system.

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Unlock Energy Savings from Your Existing AHUs

EC fan upgrades can significantly reduce energy consumption, improve airflow control, and enhance system reliability while extending the operational life of existing ventilation equipment.

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Our specialist survey team provides condition, performance, dilapidation, and HTM 03-01 compliance assessments to help clients understand the current state of their ventilation assets. Our reports provide clear recommendations for refurbishment, lifecycle replacement, energy-efficiency improvements, and compliance upgrades.

Key Challenges We Address
  • Limited visibility of AHU condition and remaining asset life
  • Uncertainty around HTM 03-01 compliance requirements
  • Identifying practical upgrade opportunities within existing equipment 
Typical Scope of Works
  • AHU condition and dilapidation surveys
  • HTM 03-01 compliance assessments and reporting
  • Airflow and ventilation performance testing
  • Energy-efficiency and decarbonisation opportunity reviews
  • Budget cost plans and upgrade recommendations
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Understand the Condition of Your Existing AHUs

Our detailed survey and reporting services provide the information needed to plan maintenance, refurbishment, compliance, and decarbonisation projects with confidence.

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We deliver targeted repair, replacement, and improvement works to help clients maintain reliable ventilation system operation. From failed components and ageing equipment to planned remedial works, our team provides practical solutions that restore performance, improve reliability, and extend equipment life expectancy.

Key Challenges We Address
  • Ageing and failing AHU components
  • Restricted access and live operational environments
  • Minimising downtime and disruption to building occupants 
Typical Scope of Works
  • Heating, cooling, and frost coil replacements
  • Fan, motor, and inverter replacements
  • Damper, actuator, and controls repairs
  • Filter, seal, and access panel replacements
  • AHU remedial works identified through surveys and inspections
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Need Support with an Existing AHU Issue?

From emergency repairs and component replacements to planned remedial works, our specialist team can help restore performance and reliability to your ventilation systems.

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How We Work

Our specialist team delivers practical AHU refurbishment and upgrade solutions that minimise disruption, improve system reliability, reduce energy consumption, and extend equipment life expectancy.
1
Survey and
Assess

We carry out detailed site surveys to assess the condition, performance, and suitability of your existing AHU systems. This includes reviewing access, compliance requirements, airflow performance, and opportunities for refurbishment or energy improvement.

2
Technical
Recommendations

Following the survey, we provide clear technical recommendations tailored to your site and operational requirements. Whether the priority is decarbonisation, HTM compliance, reliability, or reducing operational costs, we develop a practical solution around your objectives and budget.

3
Deliver in Live
Environment

Our experienced engineers complete works within live operational environments, including healthcare, commercial, retail, and education facilities. We carefully plan works to minimise downtime, maintain critical ventilation, and reduce disruption to building occupants.

4
Verify
Performance

Following completion, we validate system performance to ensure the upgraded equipment operates as intended. This can include airflow verification, fan performance checks, energy monitoring, and commissioning support to demonstrate project outcomes and operational improvements.

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.  
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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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