Duct Cleaning Cost Calculator

Most U.S. homeowners pay $450 to $1,000 for a professional whole-house air duct cleaning, per EPA and NADCA guidance. Per-vent pricing runs $25 to $50 per supply vent (about $35 on average), or roughly $0.15 to $0.40 per square foot. A typical 12-vent home with sheet metal ducts and normal dust levels lands around $370 to $538 in this calculator's fair-price band.

Contractors use three models. Per vent ($25-$50 per supply vent) is the most transparent: each register is an access point that needs individual work. Flat-rate whole-system pricing ($450-$1,000) is common for standard homes. Per square foot ($0.15-$0.40) scales with home size but ignores duct complexity. This calculator uses the per-vent model because it tracks vent count, duct type, and contamination level, then shows budget vs NADCA-certified bands.

NADCA (National Air Duct Cleaners Association) certification means the company follows the ACR standard: source-removal cleaning with HEPA-filtered negative-pressure equipment, a documented pre-inspection, and post-cleaning verification. NADCA-certified companies typically charge about 28% more — for example $448 vs $308 on a 10-vent sheet-metal job in this calculator — and in exchange you get a documented process and recourse if the work is substandard. Verify membership on NADCA's member directory before paying the premium.

Almost always. No legitimate crew can run a truck-mounted vacuum, two technicians, and 3-4 hours of labor for $99 — real costs start around $300-$400 for even a small home. The $99 offer is a classic bait-and-switch: a superficial 'blow and go' visit followed by high-pressure upsells ($500-$1,500 for 'mold treatment' found on the spot). The Quote Checker tab flags any quote under $150 or under $20 per vent as a bait risk.

Mold contamination roughly multiplies the cleaning cost by 1.75x versus normal dust, and usually adds a dedicated remediation step. Example: 14 vents of flexible duct with mold plus a dryer vent cleaning estimates $1,071, with a fair band of $942 to $1,371 (NADCA tier). Be skeptical of any company that 'finds' mold without lab testing and then quotes a four-figure remediation on the spot — that is one of the most reported upsell scams in the industry.

Yes. Sheet metal ducts (multiplier 1.00x) are the easiest to clean — smooth, rigid, and they tolerate rotary brushes. Flexible ducts (1.15x) tear easily and need gentler agitation, which takes longer. Fiberglass duct board (1.20x) has a porous lining that traps debris and can be damaged by aggressive brushing. If your quote seems high, check which duct type the contractor assumed.

Count every supply register (where air blows out) plus return grilles (where air goes back in). A quick rule of thumb used by this calculator: vents ≈ home square footage ÷ 120. So a 1,500 sq ft home has about 13 vents, a 2,000 sq ft home about 17, and a 2,500 sq ft home about 21. Counting your actual registers is more accurate — the helper is just a starting point.

Three common add-ons: sanitizing/deodorizing (around $120 in this estimator — worthwhile after mold, pests, or heavy dust), dryer vent cleaning (around $85 — genuinely valuable, since clogged dryer vents are a fire hazard), and mold remediation (around $450 and up — only with lab-confirmed mold). Skip 'UV light' or 'enzyme fog' upsells sold at the door without a written scope; legitimate add-ons are itemized before work starts.

A proper whole-house cleaning takes 3 to 5 hours for most homes: pre-inspection with a camera, negative-pressure setup, agitation and extraction of every run, register/coil/pan cleaning, and before/after verification. If a crew finishes a whole house in under 2 hours, they performed a 'blow and go' — moving dust around without extracting it. The Quote Checker flags any sub-2-hour whole-house job as a red flag.

Every 3 to 5 years for most homes, per NADCA guidance — more often with pets, smokers, allergies, recent renovation, or visible contamination. The EPA says cleaning is warranted when ducts are visibly contaminated with dust, mold, or vermin. Annual 'maintenance cleanings' pitched by door-to-door companies are upsells, not maintenance.

Common legitimate drivers: more vents than you counted, flexible or fiberglass ducts, heavy contamination or mold, multiple HVAC systems, and high-labor-cost regions. Illegitimate drivers: mold 'found' without lab evidence, vague 'whole system sanitizing' line items, and pressure to decide today. As a reference, a $650 quote for a 10-vent sheet-metal home with normal dust is overpriced against this calculator's fair band of $308 to $448 — ask for an itemized breakdown and get two more quotes.

No. This is an educational estimating tool, not professional advice. The per-vent rate, multipliers, and NADCA bands are 2026 U.S. national averages — your actual cost depends on vent count, duct type, contamination, and your local contractor market. Always get 2 to 3 written quotes from licensed local contractors and have a technician inspect your specific system. Nothing you enter ever leaves your browser.