HVAC systems work for thousands of hours each year and although their components operate in a closed circuit, they still aired from ducts. Eventually, dirt is gathered on top of the parts and failure to do air duct cleaning regularly will also increase the amount of humidity. It is not unlikely to find mold spots at parts of the unit but you will certainly find a lot of dust.
In fact, the external unit is exposed to the dirty atmosphere and weather conditions at all times and that's why condenser unit cleaning is also extremely important. If you think dust cannot do harm, take into consideration that dust collected in closed units such as the HVAC system is not innocent. It can actually have a bad impact on your health and it will surely limit the efficiency of the HVAC unit.
The complete removal of dirt from each component of the system will ensure that parts will last longer and operate better. That's one of the most important reasons why HVAC unit cleaning is important. Parts are supposed to be free of particles, dust and concentrated dirt that will affect their performance. Otherwise, they will start performing poorly, wear down sooner, will cause allergies to your family and won't produce the necessary amount of hot or cool air. Consequently, your room won't have the expected temperatures but you will still pay big amounts of money for bills.
The secret for keeping a well-maintained HVAC unit is to clean it often and make sure all parts operate fine. Hence, HVAC maintenance is vital. When you clean the parts, it's good to check their condition as well. This way, you can prevent serious problems and costly repairs. For example, when you wash the filters, check to see whether there are holes, which will allow dirt to enter your room and contaminate your indoor atmosphere. In this case, you should replace the air duct filter immediately. Clean, well-repaired parts will allow the good operation of the HVAC systems and save you money from their early replacement.