The National Air Duct Cleaners Association agrees with most of the EPA's stance on air duct cleaning with one exception -- it does recommend routine work by quality air duct cleaners every few years. According to the NADCA, consider the following when making a decision whether or not to hire an air duct cleaner: Smokers in the household Pets that shed high amounts of hair and dander Water contamination or damage to the home or HVAC system Residents with allergies or asthma who might benefit from a reduction in the amount of indoor air pollutants in the home's HVAC system After home renovations or remodeling Prior to occupancy of a new home

The National Air Duct Cleaners Association agrees with most of the EPA's stance on air duct cleaning with one exception -- it does recommend routine work by quality air duct cleaners every few years.

According to the NADCA, consider the following when making a decision whether or not to hire an air duct cleaner:

• Smokers in the household
• Pets that shed high amounts of hair and dander
• Water contamination or damage to the home or HVAC system
• Residents with allergies or asthma who might benefit from a reduction in the amount of indoor air pollutants in the home's HVAC system
• After home renovations or remodeling
• Prior to occupancy of a new home