Most,
but not all, residential indoor air quality problems can be solved by HVAC
contractors.
Realize that most (but not all) residential IAQ problems can be found and
solved by your HVAC contractors. Also, people are far more aware of the need
for solutions than ever before, because statistics show that (for some strange
reason) more people are suffering from asthma and allergies than ever before,
and even medical doctors are suggesting IAQ solutions.