As the seasons change, so do the demands on your Air-Handling Units (AHUs). These vital components of your HVAC system play a pivotal role in maintaining indoor comfort and air quality year-round. To ensure optimal performance and longevity, it’s essential to adapt your AHU maintenance routines to the specific challenges posed by each season. In this article, we’ll explore the dynamic nature of AHU maintenance across different seasons and provide a comprehensive guide to help you navigate these changes.

Seasonal Considerations for AHU Maintenance

  1. Spring:
  • Cleaning and Inspection: After winter, conduct a thorough cleaning of components and filters to remove accumulated dirt and debris. Inspect for any damage or wear caused by harsh weather conditions.
  • Filter Replacement: Replace or clean filters to ensure they are ready to handle increased pollen and allergens typical of spring.
  • Coil Cleaning: Clear evaporator and condenser coils to optimise heat exchange efficiency as the temperature starts to rise.
  1. Summer:
  • Cooling Load Check: Ensure that AHUs are capable of handling the increased cooling load by inspecting components like fans, coils, and motors.
  • Belt Tension and Alignment: Hot weather can affect belt tension and alignment. Regularly check and adjust belts to prevent slip and reduced efficiency.
  • Drainage Inspection: Confirm that condensate lines are clear and draining properly to prevent water damage and mold growth.
  1. Fall:
  • Filter Replacement: Replace filters to handle the influx of airborne particles such as leaves and dust.
  • Inspection of Heating Components: Check heating elements and combustion systems for proper operation as the temperature starts to drop.
  • Seal and Gasket Inspection: Ensure seals and gaskets are intact to prevent air leaks that could compromise efficiency.
  1. Winter:
  • Cold Weather Preparation: Check that the AHU’s heating system is functioning optimally, as it will be in high demand during the colder months.
  • Insulation Check: Inspect insulation around ductwork and components to prevent heat loss and ensure efficient operation.
  • Monitoring Outdoor Units: Clear snow and ice away from outdoor units to prevent airflow restrictions and damage.

Comprehensive AHU Maintenance Guide

  1. Create a Seasonal Maintenance Calendar: Outline the specific tasks to be performed during each season and establish a schedule to ensure timely maintenance.
  2. Inspect and Clean Regularly: Regular inspections and cleaning form the foundation of effective maintenance. Clear debris, replace filters, and address any issues promptly.
  3. Prioritise Efficiency: Adjust AHU settings to match the changing load requirements of each season, optimising efficiency and reducing energy consumption.
  4. Address Vulnerabilities Early: Identify and address potential problems during inspections to prevent costly breakdowns and interruptions during extreme weather.
  5. Involve Professionals: While some maintenance tasks can be done in-house, enlist the expertise of HVAC professionals for more complex tasks and seasonal check-ups.


AHU maintenance is a dynamic process that evolves with the changing seasons. Adapting your maintenance routines to the unique challenges posed by each season ensures that your AHUs operate efficiently, providing consistent indoor comfort and air quality. By creating a comprehensive maintenance guide and adhering to a regular schedule, you not only extend the lifespan of your AHUs but also contribute to energy efficiency, reduced operational costs, and a healthier indoor environment. Remember, a proactive approach to seasonal AHU maintenance translates to better performance and peace of mind throughout the year.