06 March 2024

What To Expect From An Air Handling Unit (AHU) Service

ISO 16890 Air Filter Test Standard

In the realm of HVAC systems, the Air Handling Unit (AHU) plays a crucial role in maintaining indoor air quality and comfort within commercial and industrial spaces. As with any mechanical system, regular maintenance is essential to ensure optimal performance and longevity. However, for those unfamiliar with AHUs and their service requirements, knowing what to expect from a professional AHU service can be beneficial. In this blog post, we’ll delve into the key aspects of AHU servicing and what you can anticipate from a reputable service.

Comprehensive Inspection

A thorough inspection is the cornerstone of any AHU service. Expect the service technicians to meticulously examine all components of the unit, including filters, coils, fans, dampers, belts, and bearings. This comprehensive assessment helps identify any issues or potential areas of concern that could affect the unit’s performance or compromise indoor air quality.

Cleaning and Maintenance

AHUs are prone to accumulating dirt, dust, and other contaminants over time, which can hinder airflow and reduce efficiency. A professional AHU service will involve thorough cleaning of all components, including coils, filters, and ductwork. Additionally, belts will be checked for tension and wear, and lubrication may be applied to moving parts to ensure smooth operation.

Filter Replacement

Filters are integral to trapping airborne particles and pollutants, preventing them from circulating throughout the building. During an AHU service, filters will be inspected for dirt buildup and damage. Depending on their condition, filters may be cleaned or replaced with new ones to maintain optimal air quality and system efficiency.

Performance Testing

Once cleaning and maintenance tasks are complete, the AHU will undergo performance testing to ensure everything is functioning as it should. This may involve measuring airflow, temperature differentials, and humidity levels to verify that the unit is operating within specified parameters. Any discrepancies or inefficiencies will be addressed promptly to restore optimal performance.

Diagnostic Analysis

In some cases, AHU servicing may uncover underlying issues that require further investigation. A reputable service provider will have the expertise and diagnostic tools to identify the root cause of any problems and recommend appropriate solutions. Whether it’s a faulty sensor, malfunctioning component, or air leakage, addressing these issues promptly can prevent more significant problems down the line.

Recommendations for Optimisation

Beyond addressing immediate concerns, a professional AHU service may also include recommendations for optimising the unit’s performance and energy efficiency. This could involve upgrading outdated components, implementing preventive maintenance schedules, or integrating advanced control systems to enhance overall system performance and reduce operating costs.

The final part of the AHU service, Westbury Group will provide you with a comprehensive report detailing the findings and actions taken during the service. This report serves as a valuable reference, providing insights into the condition of your AHU and any maintenance or repairs performed. To enhance clarity and transparency, the report may include photographs documenting the condition of key components before and after servicing. These visual aids not only help you understand the work that was done but also provide a clear picture of the AHU’s overall health. Armed with this detailed report, you can make informed decisions regarding ongoing maintenance and budgeting for future upgrades, ensuring the continued reliability and efficiency of your HVAC system.


In summary, a comprehensive AHU service encompasses a range of tasks designed to ensure the efficient operation of this critical HVAC component. From thorough inspections and cleaning to performance testing and diagnostic analysis, a reputable service provider. Westbury Group will leave no stone unturned in keeping your AHU in top condition. By investing in regular AHU servicing, you can prolong the lifespan of your system, improve indoor air quality, and minimise costly downtime. So, the next time you schedule an AHU service, know what to expect and reap the benefits of a well-maintained HVAC system.

Feel free to contact us if your Air Handling Unit Service is due.

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