This undated publicity photo provided by NADCA shows a technician using a brush to clean ductwork. If you want to freshen up the air in your home and make your heating and cooling systems work more efficiently, you might consider having the ductwork cleaned. (AP Photo/NADCA)
This undated publicity photo provided by NADCA shows a technician cutting an access hole in ductwork. If you want to freshen up the air in your home and make your heating and cooling systems work more efficiently, you might consider having the ductwork cleaned. (AP Photo/NADCA)
This undated publicity photo provided by NADCA shows the logo for NADCA. If you want to freshen up the air in your home and make your heating and cooling systems work more efficiently, you might consider having the ductwork cleaned. (AP Photo/NADCA)
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