How often should air ducts be cleaned?

There is no universal recommended frequency. The EPA does not recommend routine periodic duct cleaning. Clean when there is documented need: visible mold, pest infestation, or post-renovation debris. Regular filter changes are more impactful than routine duct cleaning.

Will duct cleaning reduce my allergies?

Limited scientific evidence supports duct cleaning for allergy reduction in the absence of mold or rodent contamination. Regular MERV 8+ filter changes, humidity control below 50%, and addressing actual allergen sources typically have more impact.

How much does duct cleaning cost?

Legitimate NADCA-certified cleaning for a typical home: $400–$1,000. Quotes below $150 are virtually always bait-and-switch. Get quotes from NADCA-certified companies.

Should I clean ducts before moving into a new home?

For newly constructed homes, yes — construction debris accumulates heavily in ductwork. For existing homes, inspect for visible contamination first. Post-renovation cleaning is warranted if ductwork was open during remodeling.

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What Is Air Duct Cleaning?

Professional duct cleaning removes accumulated dust, debris, and contaminants from HVAC ductwork — warranted when specific conditions exist, not as routine annual maintenance.

When Duct Cleaning Is Actually Warranted

The EPA and NADCA recommend duct cleaning when: substantial visible mold growth is inside ducts, ducts are infested with insects or rodents, or ducts are clogged with debris releasing into the living space. Post-renovation (construction debris), post-water damage, and post-mold remediation are also appropriate triggers. Routine preventive cleaning every few years is not supported by research.

What a Proper Duct Cleaning Includes

NADCA-standard cleaning uses truck-mounted or portable high-powered vacuum connected to ductwork, mechanical agitation tools to dislodge stuck debris, antimicrobial application if mold is found, and cleaning of HVAC components. Before/after photos should be provided. Avoid 'blow and go' operations without agitation.

Red Flags

Red flags in duct cleaning: extremely low prices ($49–$99 whole-house specials are virtually always bait-and-switch), high-pressure upsells for sanitizers, claims that dirty ducts cause specific health symptoms without documentation, and no NADCA certification.

Duct Sealing vs. Duct Cleaning

If your ducts leak, duct sealing provides far greater energy savings than cleaning. Ask about duct leakage testing — most systems lose 20–30% of conditioned air through leaks. Address leaks before or alongside cleaning.

What to Look for in a HVAC Provider

State HVAC contractor license (required in most states) and EPA 608 certification for refrigerant handling
NATE (North American Technician Excellence) certification — the industry's highest technical standard
Experience with your specific equipment brand (ask about their top manufacturer relationships)
Transparent flat-rate or hourly pricing disclosed before the technician arrives
Manufacturer-authorized for warranty repairs on your brand
Maintenance plan options that include priority emergency scheduling

Professional Air Duct Cleaning