How often should HVAC systems be cleaned?

HVAC system

Heating, ventilation, and air-conditioning (HVAC) systems help to maintain quality indoor air. Without regular cleaning, the HVAC system’s performance will deteriorate.


At NCH Asia, we often hear the question “how often should I clean my HVAC system?” This depends on a number of factors such as:

  • The design of the system
  • The purpose of the system
  • The environment the system is running in

However, it should be mentioned that every HVAC system should be regularly cleaned and maintained. In this article, we will explore the problems associated with unclean HVAC systems as well as the measures that should be taken to avoid these issues.   

Potential problems in unclean HVAC systems

Air filters – air filters clog up and allow dust particles and dirt to accumulate inside the system, causing a number of problems in the internal unit. Dirty filters cause a lack of air flowing through the system so the internal mechanisms.

Fans – clogged fans cause them to be sluggish and need to work harder to produce the same air-quality. A dirty fan increases the chances of a build-up of heat in the heat exchanger. When this happens, it can result in a complete system failure.

Cooling coils – an accumulation of dirt leads to cooling coils and other components within the HVAC system to malfunction. This can cause the evaporator coils to freeze. Once this happens, air-flow is restricted and the system is unable to maintain indoor climate control.

Air ducts – air quality is reduced when air ducts are dirty. Dust and dirt particles get into the air (which can be damaging to human health). At the same time, the HVAC system takes in the unclean air and the process repeats.

How can these HVAC problems be avoided?

HVAC systems need to be cleaned regularly in order to prevent system failure and potential health hazards. Air filters should be changed as often as needed in order to maintain efficiency, and internal system components need to be checked often for signs of dirt accumulation or deterioration.  Larger HVAC systems often need to be maintained more regularly depending on the environment and surroundings.

NCH Asia’s HVAC cleaning services are the ideal solution for your commercial and industrial HVAC system maintenance.


Contact Us

Interested in knowing what we can do for you?

Interested in being part of our team? Take a look around our careers pages to find out where your career could begin with NCH Asia.

Contact us