Some comfort and indoor air quality issues we encounter bleed over from areas that we might be unfamiliar with. The most common are the influences of building construction, like leakage and insulation.
The pandemic increased awareness of the poor state of HVAC systems in many schools. Now, money for school IAQ projects is becoming available from a variety of sources.
Air handlers are the heart of an HVAC system, moving the conditioned air through a building. Like a heart, they can generate a lot of noise while operating. Manufacturers, however, are taking steps to reduce that noise.