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Washington, D.C.-based National Air Duct Cleaners Association (NADCA) introduced Assessment Cleaning and Restoration of HVAC Systems (ACR 2005), the most detailed industry standard for cleaning air-handlers and other components.
It states: “Cleaning is highly recommended for heat-exchange coils, cooling coils, air-flow control devices, filtration devices, and air-handling equipment determined to have restrictions, blockages, or contamination deposits that may cause system performance inefficiencies [or] air-flow degradation, or that may significantly affect the design intent of the HVAC system.”
As a HVAC air handler ages it becomes less efficient and can have an effect on Indoor air quality. The cleaning of a HVAC air handler is often neglected but can help equipment run at optimum efficiency and improve indoor air quality.
AIR BLOWERS
Simple removal of soil/dirt and corrosion build up from blower blades can improve air movement efficiency by as much as 50 percent. The air blowers supply air to the homes or businesses ductwork, if air movement efficiency is hindered by dirt/soil build up in the blowers blades the supply air will not be sufficient.
FILTRATION EQUIPMENT
Cleaning or replacing filters on a regular basis is a task that is cost effective and often pays for itself. Air filters block contaminants from entering the air handler. Without proper filtration or no filter at all, debris from the air return will contaminate the air handler making it less efficient. It is important to check which filter is recommended for your system.
COOLING COILS
The ability of cooling coils (evaporator coils) to cool air to the desired temperature is directly related to its cleanliness. Debris in the cooling coils fins from improper filtration and lack of maintenance can hinder air flow. Proper cleaning of a contaminated cooling coils can ensure a desired temperature is met more quickly.