How to hire a duct cleaning technician: requirements, pay to offer, where to find them and how to screen

You are hiring the tech who keeps an HVAC service line billable: cleaning duct systems to a written standard, working in attics, crawl spaces and mechanical rooms, and leaving the customer's interior exactly as clean as you found it.

Before you write the posting, decide what the role carries in your operation:

• Equipment and access work. Collection vacuums, agitation tools and access panels, worked in tight attics and crawl spaces — the physical core of the job.
• Standard discipline. Working to the written standard your company runs on — NADCA's ACR, Assessment, Cleaning & Restoration of HVAC Systems, 2025 Edition, is the current edition this research verified — and logging anything that does not fit it.
• Customer-interior care. Duct work happens inside occupied homes and businesses. The tech protects floors and furnishings and explains the equipment noise and access openings in plain words.
• Documentation. What the tech found, what was cleaned and the before-and-after record — the file your office bills from and your customer reads.
• A driving day. Duct work is a multi-stop day out of a truck, so routing, vehicle care and a full day of availability are part of the job.
• After-hours terms. Where you offer evening or weekend service, the posting should say so up front rather than surprising the hire in week two.

The shape of the hire depends on the company. A restoration company adding duct cleaning staffs it as a specialty inside an existing crew; a carpet or duct cleaning company adding restoration needs the reverse — a tech who can support a water loss on Monday and a duct job on Wednesday. Whichever direction you are hiring from, a cross-train from the bench you already have is a path worth pricing before you post. If you are building the wider crew itself — first tech, a rebuild after churn, storm staffing — start from hiring for your restoration company, then come back here for the role-specific screen.

The worker-side view of the job — the day-to-day, the route in, the tools — is the career guide to what a duct cleaning technician does. This page stays on your side of the hire.

Separate two things that get blurred: certifications, which are credentials your company requires, and licenses, which are state law attached to the work itself.

The specialty credential is NADCA's Air Systems Cleaning Specialist (ASCS). NADCA's Certification Council sets no formal eligibility prerequisites for the exam — access is deliberately broad and the rigor sits in the exam itself — though NADCA recommends 2 to 4 years of field experience before a candidate sits it. The exam costs $385 on NADCA's testing site.

Renewal is annual: ASCS holders renew by June 30 each year with 6 Continuing Education Credits (CECs), plus an annual maintenance fee of $95 for NADCA members or $920 for non-members. A certification that lapses is not renewed — the holder retakes the exam.

Membership adds its own requirement. NADCA membership is not required to hold the ASCS — non-members can certify and renew — but NADCA Regular Member companies must keep at least one certified ASCS on staff at each location. If your company is, or wants to be, a NADCA Regular Member, the ASCS on staff is a membership requirement: hire one or sponsor one.

For inspection-heavy work, sitting the exam for NADCA's Certified Ventilation Inspector (CVI) credential requires an active ASCS certification first — sequence the two if you staff duct inspections separately from the cleaning work. The credential detail, exam and renewal cycle live in the NADCA ASCS certification guide, and the standard the work runs to is covered in the NADCA ACR standard guide.

Set the requirement the way that fits your bench: certified on hire, or hired for work habits and sponsored through the ASCS inside a window you set. Either way, name it in the posting — and verify a held certification with NADCA rather than with a photocopy of a card.

Licenses are a different question. Licensing attaches to the work and the state, not the job title. This page's research verified the NADCA credential structure but did not verify state licensing rules specific to duct cleaning work — contractor licensing, registration or local rules can still apply to the service line you are staffing. Confirm what applies with your state contractor licensing board before you hire into the work.

Rules change. Certification requirements are yours to set; licensing is state law and it moves. Confirm the current requirements with your state licensing agency and with NADCA before you rely on either in a posting.

No BLS occupation line is titled "duct cleaning technician" in the sources this research checked, so there is no measured national wage to quote for the role — and this page quotes no proxy in its place. Set the number you post from your own market: the postings you compete against for the same techs, and your job costing, which tells you what a billable duct job supports after truck, equipment and overhead.

The worker-side view of pay — what candidates see and ask about — is the duct cleaning technician pay guide.

However you structure the rate, the Fair Labor Standards Act (FLSA), which the Department of Labor's Wage and Hour Division enforces, sets the floor underneath it:

• Overtime. FLSA overtime is paid at not less than 1.5 times the employee's regular rate (29 CFR 778.107).
• Bonuses. Promised production, attendance or retention bonuses are not discretionary; they fold into the regular rate for overtime.
• A driving day is a paid day. Job-site-to-job-site travel during the workday is hours worked, and so is the drive from a required shop or meeting point to the first job — the routing that defines duct work.

The posting itself carries content requirements in some of the states this research verified:

• California — employers with 15 or more employees must include the pay scale in any job posting.
• New York — businesses with four or more employees must list a compensation range in advertised jobs and say whether the job is commission-based.
• Washington — employers with 15 or more employees must disclose the wage scale or salary range plus a general description of benefits.
• Illinois — employers with 15 or more employees must include the pay scale and benefits in a specific posting, which a hyperlink can satisfy.
• Colorado — compensation, benefits and how to apply must be disclosed in all job postings.

That list is where this page's research verified a rule, not an exhaustive one — check your own state labor agency before you post, and the job posting guide covers the rest of the ad. Compete on more than the rate: sponsoring the ASCS for a hire who arrives without it, publishing the schedule and any on-call terms before the offer, and paying overtime honestly through the busy season.

The candidate pool overlaps with the trades that already do the physical work, so work these pools before you spend anything on reach:

• Your own bench. A carpet cleaning tech already works out of a truck, inside occupied homes, to a repeat-service schedule — the same interior care and driving rhythm, and a cross-train keeps someone you have already vetted.
• The adjacent trades. HVAC service technicians, restoration and water techs who want a specialty, and remodelers. HVAC familiarity shortens the ramp; the work habits you screen for anyway — showing up, working clean, talking to customers — are what to probe.
• Career changers worth targeting directly. Veterans, firefighters and tradespeople changing fields. Write the posting so they can see the path: entry requirements, the certification you sponsor, the ladder to crew lead. The career changers guide covers the outreach.

Post where the candidates you want already look. A general board lists a duct cleaning opening among unrelated trades; run it where cleaning and restoration techs browse. The where to post the job guide compares the options, and you can see the postings yours will sit next to on the duct cleaning technician jobs page.

Then check the wording. The Equal Employment Opportunity Commission (EEOC) bars help-wanted ads that show a preference for or discourage applicants based on race, color, religion, sex, national origin, age (40 and up), disability or genetic information. The agency's own example is an ad seeking "females" or "recent college graduates", which may discourage men and people over 40 from applying. Write the physical demands as functions — attic and crawl space access, ladder work, equipment handling — rather than as age or strength coding.

Run the screen in one order, and keep it lawful at every step:

1. Phone screen. Availability, driver's license, certifications held or wanted (ASCS or equivalent), and which side of the trade they come from — cleaning, HVAC or restoration.
2. Structured interview. Same questions for every candidate, so you can compare answers. Walk through a duct job they have actually worked: what did you set up first, how did you protect the interior, what did you log at the end? Listen for standard discipline — working to the written standard and flagging what does not fit instead of improvising.
3. Skills probe or ride-along. Half a day on a real job. Watch the equipment setup, the access work in attic or crawl, the care around occupied interiors and the documentation — the equipment a tech works with is covered in the duct cleaning equipment guide and the job sequence in the duct cleaning process guide. One legal note first: under 29 CFR 785.11, work the employer suffers or permits — and knows or has reason to believe is happening — is work time, even work it did not request. Whether a candidate's ride-along time is employment under the FLSA is fact-specific, and this page's research holds no Wage and Hour Division source saying every ride-along must be paid. Where the candidate is doing the job's work, pay for the time and confirm the treatment with the Wage and Hour Division.
4. Checks. Background, driving record and references, run in the order the law requires (below).
5. Offer. Conditional on the checks, with pay, schedule and any on-call terms, and the certification plan in writing.

The interview itself has edges. Under the ADA, as the EEOC reads it, an employer may not ask medical or disability questions or require a medical exam before a job offer — but may ask whether and how a candidate can perform the job. Phrase the physical requirements as functions: attics, crawl spaces, ladders, equipment handling, respirator wear where you require it. Keep the respirator medical evaluation where it belongs — after an offer, inside your respiratory protection program.

Criminal history is another edge. The EEOC says employers can consider criminal records in hiring but may not treat applicants differently by race or national origin when doing so, and the agency notes some states restrict when criminal history may be asked during the hiring process. Check your state's rule before the question goes on the application.

Background reports and driving records are consumer reports when you buy them from a screening company. The Federal Trade Commission (FTC) requires, before you order one, a written disclosure that stands alone — it cannot live inside the application — and the applicant's written permission. Before rejecting an applicant based on the report, the FTC requires a pre-adverse-action notice with a copy of the report and a summary of the applicant's rights under the Fair Credit Reporting Act. Set the driving-record expectations themselves with your insurance agent before the posting goes up — a duct tech lives in the truck. The background checks guide walks the sequence for restoration hires.

Pay history has state edges too. California generally bars employers from seeking an applicant's salary history but allows questions about salary expectations. Illinois bars asking about or screening applicants on wage or salary history. Colorado bars asking about or relying on an applicant's pay history. Ask what a candidate is looking for rather than what they made, and check your own state before the interview script is final.

Order matters. Disclosure and consent before the report; the report and the rights summary before any rejection. Run the sequence past counsel or your state labor agency once — it is the same sequence for every hire after.

The hire is made — or lost — in the first weeks, and most of it is writing things down.

Paperwork first. Form I-9, Section 2 is due within 3 business days of the employee's first day. Hire on a Monday and it is due by Thursday; for a job lasting fewer than 3 business days, it is due on the first day.

Safety before the first job, not after the first incident. Where respirators are required, OSHA's respiratory protection standard (29 CFR 1910.134) calls for a written program run by a suitably trained program administrator. Fit testing happens before first use, whenever a different facepiece is used, and at least annually after that — and the respirators, the training and the medical evaluations are provided at no cost to the employee. The respiratory protection program guide assembles the employer side.

Then a ramp, not a trial by fire. First weeks ride with a lead tech. Own the documentation — the before-and-after record, the photos, the notes on what the system contained — before owning production. If the hire arrived without the ASCS, sponsor it now: the exam, the annual renewal and the CECs become part of your training budget, and NADCA technicians can earn renewal CECs at NADCA's Fall Technical Conference or Annual Meeting & Exposition. The training guide lays out the first weeks for a new restoration hire, and the onboarding checklist keeps the paperwork ordered.

Keep them with a visible ladder. Name the next step on day one — tech to senior tech to crew lead — and put the ASCS renewal on the company calendar, because the June 30 deadline and the 6 CECs arrive every year whether or not anyone is watching. Put pay reviews on a scheduled calendar, publish the schedule and any on-call rotation well in advance, and when someone resigns, ask the real reason rather than the polite one. The on-call rotation guide works through scheduling terms, and the retention guide collects what keeps restoration crews intact.

Employer information, not licensing, legal, insurance, health or tax advice. Confirm requirements with your state licensing agency, and with OSHA, the Department of Labor, NADCA, an insurance professional or counsel where the question is theirs.