Latest Findings

Latest Findings
Despite more than two decades of research, there is still not enough evidence to draw solid conclusions
about duct cleaning’s benefits on indoor air quality, occupants’ health, HVAC system performance, or
energy savings, according to a 2010 review of scientific studies on duct cleaning.1 The review did find
clear evidence that ductwork can be contaminated with dust and can act as a reservoir for microbial
growth under normal operating conditions. Yet, even when duct cleaning was extremely efficient at
removing contaminants within ducts, the
effectiveness of reducing indoor air pollutants was
highly variable, and in many cases, post‐cleaning
levels of contaminants were higher than pre‐
cleaning levels.