1. Reduced utility costs.
2. Increases the life of HVAC equipment. It will show improved performance after every service and you can postpone the need of replacing such an expensive system. It will thus reduce replacement costs.
3. Improve the level of comfort for all residents.

Following are the best practices for hygienic HVAC maintenance.

1. Choose a filter of good capacity: MERV is the standard of determining the best filter. Higher is the MERV rating of the filter more is its efficiency in the filter removing small particles. Filters having an MREV of rating of 11 and above are usually recommended. The type of filter used also makes a difference to the indoor air. Pleated filters that are composed of cotton or synthetic fabrics are costly, but use of fabric increases the efficiency and pleats enhance the effective area.

1. Replacement of filters: All filters should be replaced after every six months. This improves the efficiency of the system in cleaning the indoor air.

1. Clean the coils of evaporator and condenser at least once or twice in a year: Every time the HVAC system works the evaporator coils become damp. These places promote the growth of molds and fungi. Along with humidity, the supply area of the coil remains in contact with hot, humid air from outside. This, exposure to the unfiltered outdoor air, results in considerable degradation. Although cleaning condenser coil does not directly affect the quality of indoor air, but simultaneous cleaning of evaporator coil helps to improve energy efficiency of the system. 

1. Treat the coils after cleaning: The growth of mold on a coil is a quick process. Coils should therefore be treated with antimicrobial treatments, like Micro-Biocide after every cleaning. This inhibits the growth of molds on the coil and is vital for HVAC maintenance.

1. Inspect the area around HVAC system: Pooling of water is a common problem in HVAC systems. This promotes the growth of molds and organisms. It is, therefore, important to inspect the area around the HVAC system and do the required drying so that system efficiency is maintained.

1. Fix the leaks in supply duct and cabinet: This should be done at least once in a year. Survey all leakages and take corrective actions as soon as possible. Integrity of cabinet and ducts is important particularly on the face form where air is supplied.
2. Clean and adjust the dampers annually: Improperly operating dampers negatively affect the quality of indoor air. Dampers should thus be cleaned and adjusted at least once every year.

1. Inspect the fan, belts and bearings: Although proper operation of bearings, fans, and belts does not have much impact on air quality, but should be done as preventative measure in HVAC maintenance

1. Clean the air ducts: All air ducts should be regularly inspected and cleaned as per the requirement.

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