AHU Coil Cleaning London

In this article, we will be focusing on the importance of AHU coil cleaning in London. As an HVAC system owner, it is crucial to ensure that the coils within your air handling units (AHUs) are clean a...

In this article, we will be focusing on the importance of AHU coil cleaning in London. As an HVAC system owner, it is crucial to ensure that the coils within your air handling units (AHUs) are clean and properly maintained. Dirty coils can lead to various issues such as reduced energy efficiency, poor indoor air quality, and even system breakdowns. By understanding the significance of AHU coil cleaning and the benefits it brings, you can ensure the optimal performance and longevity of your HVAC system.

Importance of AHU Coil Cleaning

Regular maintenance and cleaning of the Air Handling Unit (AHU) coils is essential to ensure optimal performance, energy efficiency, and indoor air quality. AHU coil cleaning not only enhances air quality but also improves energy efficiency, extends the lifespan of the AHU, and reduces maintenance costs.

Enhances Air Quality

The AHU coils play a crucial role in the HVAC system by transferring heat and moisture. Over time, these coils can accumulate dust, dirt, and other contaminants, which can severely impact indoor air quality. Unclean coils can lead to the circulation of pollutants, allergens, and even mold spores throughout the space. By regularly cleaning the AHU coils, you can significantly improve the air quality and create a healthier environment for building occupants.

Improves Energy Efficiency

Dirty AHU coils can hinder the transfer of heat, reducing the energy efficiency of the HVAC system. When coils become coated with dust and contaminants, airflows are restricted, causing the system to work harder and consume more energy to maintain the desired temperature. By cleaning the coils, you can restore their heat transfer capabilities, thus optimizing energy efficiency and potentially reducing energy bills.

Extends the Lifespan of the AHU

Proper maintenance and cleaning of the AHU coils can help extend their lifespan. When coils are heavily contaminated, they are more prone to corrosion and damage. Over time, this can lead to coil failure and the need for costly replacements. By following a regular coil cleaning routine, you can prevent premature coil deterioration, thereby maximizing the lifespan of your AHU system.

Reduces Maintenance Costs

Neglecting to clean the AHU coils can result in increased maintenance and repair costs. Dirty coils can create blockages and impede proper airflow, leading to strain on the HVAC system components such as fans and motors. This increased workload can cause higher wear and tear, resulting in more frequent breakdowns and maintenance requirements. By investing in regular AHU coil cleaning, you can significantly reduce the need for repairs and lower overall maintenance costs in the long run.

Common Causes of AHU Coil Contamination

Several factors contribute to the contamination of AHU coils. Understanding these common causes can help in implementing suitable preventive measures and effective cleaning strategies.

Dust and Dirt Accumulation

Dust and dirt particles are commonly found indoors and can accumulate on the AHU coils. These particles are drawn in with the return air and can settle on the coil surfaces, restricting heat transfer and obstructing proper airflow. High levels of dust and dirt contamination can lead to reduced system efficiency and compromised indoor air quality.

Microbial Growth

Moisture and organic matter provide a conducive environment for microbial growth, such as mold and bacteria. When AHU coils become contaminated with moisture, either due to high humidity or condensation, it creates an ideal breeding ground for these microorganisms. Not only does microbial growth hinder efficient heat transfer, but it also poses a significant health risk to building occupants by releasing harmful spores and volatile organic compounds (VOCs) into the air.

Chemical Build-up from Outdoor Air

Outdoor air contains various pollutants, chemicals, and volatile organic compounds (VOCs), which can enter the HVAC system and settle on the AHU coils. Over time, these chemicals can accumulate and form a layer on the coils, reducing their effectiveness and potentially leading to corrosion and damage. Chemical build-up negatively impacts both the system’s performance and indoor air quality.

Inadequate Filtration Systems

Insufficient or poorly maintained filtration systems can contribute to AHU coil contamination. When air filters are clogged or not replaced regularly, more contaminants pass through and settle on the coils. Ineffective filtration allows airborne particles, such as dust, pollen, and allergens, to accumulate on the coils, compromising indoor air quality and system efficiency.

AHU Coil Cleaning Methods

Several cleaning methods are employed to ensure the proper maintenance and cleaning of AHU coils. The choice of method depends on various factors, including the extent of contamination, coil material, accessibility, and specific cleaning requirements.

Physical Cleaning

Physical cleaning involves removing debris, dust, and other contaminants from the coil surfaces manually. This method may include the use of brushes, compressed air, or vacuuming equipment to dislodge and remove the build-up. Physical cleaning is effective for removing larger debris but may not be sufficient for eliminating microbial growth or stubborn contaminants.

Chemical Cleaning

Chemical cleaning is a common method used to remove contaminants that adhere to AHU coils. Specialized cleaning solutions, typically formulated with non-toxic and biodegradable ingredients, are applied to the coils to dissolve and break down the build-up. These solutions are designed to effectively remove dust, dirt, grease, and microbial contaminants. Chemical cleaning should be performed by trained professionals to ensure safety and to follow manufacturer guidelines.

Steam Cleaning

Steam cleaning involves using high-pressure steam to clean AHU coils thoroughly. This method is effective in removing stubborn contaminants and microbial growth. The high temperatures of the steam help to sterilize the surfaces and eliminate any bacteria or mold present. Steam cleaning is particularly useful for AHU coils with heavy contamination or when deep cleaning is required.

Coil Restoration

In some cases, AHU coils may require restoration if they are severely damaged or corroded. Restoration involves the repair or replacement of damaged coils to ensure optimal performance. This may involve replacing specific coil sections or the entire coil, depending on the extent of the damage.

Choosing a Professional AHU Coil Cleaning Service

When selecting a professional AHU coil cleaning service, several factors should be considered to ensure a thorough and effective cleaning process.

Experience and Expertise

It is essential to choose a company with extensive experience and expertise in AHU coil cleaning. Look for a service provider that has a proven track record of handling similar projects and possesses the knowledge and skills necessary to perform the task effectively. Experienced professionals will understand the intricacies involved in AHU coil cleaning and can ensure a comprehensive cleaning process.

Use of Environmentally-Friendly Products

Environmental consciousness is crucial in today’s world. Opt for a service provider that uses environmentally-friendly cleaning products that are non-toxic, biodegradable, and safe for both humans and the environment. By choosing a company that prioritizes eco-friendly practices, you can contribute to a sustainable future while ensuring the cleanliness and efficiency of your AHU coils.

Compliance with Safety Standards

AHU coil cleaning involves handling potentially hazardous substances, such as cleaning chemicals and microbial contaminants. It is important to choose a service provider that complies with all relevant safety standards and regulations. The company should ensure the safety of their workers, building occupants, and the environment during the cleaning process.

Positive Customer Reviews

Consider the reputation and feedback from previous customers when choosing an AHU coil cleaning service. Positive customer reviews demonstrate the company’s ability to deliver quality results and customer satisfaction. Look for testimonials or ask for recommendations to ensure you select a reputable and reliable service provider.

Signs that AHU Coil Cleaning is Required

Regular AHU coil cleaning is vital, but how do you know when it’s time to clean the coils? Here are some common signs that indicate AHU coil cleaning is required.

Decreased Airflow

If you notice a decrease in the airflow from the HVAC system, it may indicate that the AHU coils are contaminated. Contaminants on the coil surfaces restrict the flow of air, reducing the system’s efficiency and overall performance. A decrease in airflow could also be caused by other issues, so it is best to consult a professional to pinpoint the exact cause and recommend the appropriate cleaning method.

Increase in Energy Consumption

Dirty AHU coils can significantly impact the energy efficiency of the HVAC system. When coils are coated with contaminants, the system has to work harder to achieve the desired temperature, consuming more energy in the process. If you notice a sudden increase in your energy bills without any other explanation, it may be a sign that your AHU coils need cleaning.

Presence of Foul Odors

Unclean AHU coils can produce foul odors due to the accumulation of microbial growth, dust, and other contaminants. These odors can be unpleasant and may be an indicator of a compromised indoor air quality. If you notice persistent foul smells in your facility, it’s essential to have the AHU coils inspected and cleaned to eliminate the source of the odor.

Visible Mold or Mildew

The presence of visible mold or mildew on the AHU coils is a clear sign that cleaning is required. Mold and mildew are not only unsightly but also pose significant health risks. These fungi release spores into the air, which can trigger respiratory allergies and asthma attacks. In the case of visible mold or mildew growth, immediate action should be taken to prevent further contamination and ensure the health and safety of building occupants.

Benefits of Regular AHU Coil Cleaning

Regular AHU coil cleaning offers numerous benefits, both for the HVAC system and the indoor environment.

Optimized HVAC System Performance

Clean AHU coils allow for efficient heat transfer, ensuring the HVAC system operates at its peak performance. When coils are free from contaminants, airflows are unobstructed, leading to improved temperature control and proper humidity levels. By optimizing the performance of the HVAC system, you can create a comfortable and healthy indoor environment for occupants.

Enhanced Indoor Air Quality

AHU coil cleaning significantly contributes to enhanced indoor air quality. By removing dust, dirt, allergens, and microbial contaminants from the coils, the airflow through the system remains clean and free from pollutants. This leads to a decrease in respiratory hazards, allergens, and other irritants circulating within the building, creating a healthier and more comfortable environment for building occupants.

Cost Savings on Energy Bills

Clean AHU coils result in improved energy efficiency, translating into cost savings on energy bills. When coils are free from contaminants, the HVAC system operates more efficiently, requiring less energy to achieve the desired temperature. By reducing the workload on the system, regular coil cleaning can help lower energy consumption, resulting in significant cost savings over time.

Reduction in Allergy and Asthma Triggers

Indoor allergens and respiratory irritants, such as dust mites, pollen, and mold spores, can trigger allergies and asthma attacks. Clean AHU coils help remove these allergens from the indoor air, reducing the risk of allergic reactions and respiratory discomfort. Regular coil cleaning is particularly beneficial for individuals with respiratory conditions, sensitivities, or allergies.

DIY AHU Coil Cleaning Tips

While it is always recommended to hire professionals for AHU coil cleaning, there are some maintenance tasks you can perform yourself to keep the coils in better shape between professional cleanings.

Turn off the AHU

Before attempting any cleaning or maintenance, it is crucial to turn off the AHU to ensure your safety and prevent damage to the system. This can usually be done by switching off the power at the main circuit breaker.

Remove Access Panels

Once the AHU is powered off, remove any access panels or covers that provide access to the coils. This will allow you to easily reach the coils for cleaning.

Vacuuming Loose Debris

Using a vacuum cleaner with a brush attachment, gently remove any loose debris from the coil surfaces. Be careful not to damage the delicate fins of the coils.

Gentle Brushing of Coils

With a soft-bristle brush, gently brush the coil surfaces to dislodge any stubborn dirt or contaminants. Avoid using excessive force to prevent bending or damaging the fins.

Using Mild Detergent Solution

Prepare a mild detergent solution by mixing a small amount of mild dish soap with warm water. Dip a soft cloth or sponge into the solution, wring out excess moisture, and wipe down the coil surfaces. Be sure to cover the entire coil area, including the space between the fins.

Rinsing and Drying the Coils

After cleaning with the detergent solution, thoroughly rinse the coils with clean water. Ensure that all detergent residue is removed. Once rinsed, allow the coils to air dry before reassembling the access panels. Ensure the coils are completely dry to prevent mold or mildew growth.

Preventive Maintenance for AHU Coils

Regular preventive maintenance is essential to keep AHU coils in optimal condition and maintain their efficiency. Here are some preventive maintenance tasks that should be performed regularly.

Regular Filter Replacement

Clean filters are crucial for preventing contaminants from reaching the AHU coils. Regularly inspect and replace air filters according to the manufacturer’s recommendations. Clogged filters restrict airflow and can lead to increased strain on the coils, reducing system efficiency.

Periodic Inspection of Coils

Besides regular cleaning, it is important to inspect AHU coils periodically for any signs of contamination, corrosion, or damage. Early detection of issues allows for timely remediation, preventing further damage and avoiding costly repairs or replacements.

Airflow Monitoring

Monitor the airflow throughout the HVAC system to ensure that it remains consistent and unobstructed. Any sudden changes in airflow could indicate a need for coil cleaning or other maintenance tasks.

Cleaning and Sanitizing Drain Pans

Drain pans located beneath AHU coils can accumulate water and debris. Regularly clean and sanitize drain pans to prevent odor and microbial growth. Ensure that the drain lines are clear and functioning correctly.

Maintaining Adequate Ventilation

Ensure that the AHU and ventilation systems are properly maintained and functioning effectively. Adequate ventilation prevents the buildup of indoor pollutants and moisture, reducing the risk of contaminating the AHU coils.

Additional Services Provided by AHU Coil Cleaning Companies

Professional AHU coil cleaning companies often offer additional services to ensure comprehensive HVAC system maintenance and indoor air quality improvement.

Air Duct Cleaning

Air ducts can become contaminated with dust, dirt, and other pollutants, which can affect indoor air quality. AHU coil cleaning companies may provide air duct cleaning services to remove debris and improve airflow throughout the system.

Air Quality Testing

To assess the indoor air quality accurately, AHU coil cleaning companies may offer air quality testing services. These tests measure the levels of pollutants, allergens, and microbial contaminants present in the indoor environment. Based on the test results, appropriate measures can be taken to improve air quality.

Coil Coating

Coil coating involves the application of protective coatings to AHU coils. These coatings help repel contaminants, improve heat transfer efficiency, and reduce the frequency of cleaning. AHU coil cleaning companies may offer coil coating services as an additional preventive maintenance measure.

Coil Repair or Replacement

In cases of severe coil damage or corrosion, AHU coil cleaning companies may provide coil repair or replacement services. These professionals can determine the extent of the damage and recommend the appropriate course of action to restore the coils’ functionality.

HVAC System Tune-Up

In addition to AHU coil cleaning, many service providers offer comprehensive HVAC system tune-up services. These tune-ups may include inspecting and cleaning other system components, including fans, belts, motors, and ductwork, to ensure optimal performance and energy efficiency.


Regular AHU coil cleaning is crucial for maintaining optimal indoor air quality and energy efficiency. By removing dust, dirt, and contaminants from the coils, you can improve the performance of your HVAC system and create a healthier environment for building occupants. Hiring a professional AHU coil cleaning service in London ensures a thorough and effective cleaning process, safeguarding the longevity and efficiency of your AHU system. By considering the factors discussed in this article, such as experience, use of environmentally-friendly products, compliance with safety standards, and positive customer reviews, you can make an informed choice when selecting a service provider. Prioritizing regular AHU coil cleaning and preventive maintenance measures can lead to cost savings, improved indoor air quality, and reduced allergens and asthma triggers, ensuring a comfortable and healthy indoor environment.

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