How should a residential HVAC system be cleaned?

The most effective way to clean air ducts and ventilation systems is to employ Source Removal
methods of cleaning. This requires a contractor to place the system under negative pressure,
through the use of a specialized, powerful vacuum. While the vacuum
draws air through the system, devices are inserted into the ducts to dislodge any debris that might
be stuck to interior surfaces. The debris can then travel down the ducts to the vacuum, which
removes it from the system and the home.

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