There is a particular HVAC problem that is often the root cause of sick building syndrome. In an air conditioning system, there are evaporator coils and condenser coils. The fan in the unit extracts heat from inside the building, and it is drawn to the evaporator coil. After that, the warm air enters the condenser coil where it is ultimately blown out of the outdoor air conditioning unit.
As you can see, the evaporator coil plays an important role. If it gets dirty, there will be an airflow reduction, and the efficiency of the coil will fluctuate. This makes the system work harder, and as a result, there is much more energy usage.
A dirty condenser coil, as well as the evaporator coil, will create a domino effect of negativity. The added heat in the system will create increased head pressure, and this will greatly diminish the unit’s cooling capacity. Basically, you pay more for less cooling power when there is a compromised condenser coil in your system.