**Short answer:** you can verify NADCA membership yourself in about two minutes using NADCA's own member directory. A logo on a website, a truck, or a flyer proves nothing — the directory is the only source that matters. Ask separately whether the technician who will actually be in your home holds the ASCS credential. The air duct cleaning trade has a low barrier to entry. A vacuum, a van, and a website is enough to start taking calls. That's exactly why an independent credential exists, and exactly why it gets misrepresented. Here's how to check for yourself. ## What NADCA actually is NADCA is the National Air Duct Cleaners Association, the trade body that publishes the technical standard the industry works to — the ACR Standard, which governs assessment, cleaning, and restoration of HVAC systems. Membership isn't automatic. Member companies must have certified personnel on staff, carry general liability insurance, and agree to clean in accordance with the standard. The important thing to understand: **NADCA certifies people and admits companies. It does not certify equipment, vans, or marketing materials.** Anyone can put a logo on a website. ## The credential that belongs to a person **ASCS — Air Systems Cleaning Specialist.** This is the individual certification. Someone earns it by passing an exam covering HVAC systems, cleaning methodology, and the standard itself, and maintains it through continuing education. A company can hold NADCA membership on the strength of one ASCS on staff. That doesn't guarantee the person showing up at your door is that individual. It's a fair question to ask, and a reputable contractor will answer it directly. There are related credentials you may see: **VSMR** (Ventilation System Mold Remediator) and **CVI** (Certified Ventilation Inspector). Each covers a specific scope of work. ## How to verify, step by step 1. **Go to NADCA's website and open the member directory.** It's public and searchable by location and company name. 2. **Search by company name, not just by area.** If they claim membership and don't appear under their own name, that's your answer. 3. **Confirm the business name matches.** Companies operating under a DBA sometimes appear under a different legal name. Ask them which name they're listed under — a straight answer is easy to give. 4. **Ask for the ASCS holder's name.** Then ask whether that person will be on your job. 5. **Ask for proof of general liability insurance.** A certificate of insurance naming you or your address is standard and takes a contractor about five minutes to produce. If a company gets evasive at any point in that sequence, you have the information you need. ## Certification doesn't guarantee a good job Being honest about this matters more than the marketing does. NADCA membership tells you a company has met a baseline and has agreed to work to a published standard. It doesn't tell you whether the crew that shows up will be thorough, punctual, or careful with your floors. Certified contractors do bad work sometimes. Uncertified ones occasionally do fine work. What certification gives you is recourse and a reference point. There's a written standard the work is supposed to meet, and a body that governs membership. Without that, "we cleaned your ducts" means whatever the contractor decides it means. ## The other things worth checking Verification is one input. Alongside it: **Get the scope in writing.** Specifically whether supply runs, return runs, registers, and the air handler are all included, or whether some of those are add-ons. Scope disputes are the single most common source of complaints in this trade. **Get the price in writing.** Per-vent pricing that grows on the day of service is a familiar pattern. A whole-system quote you can hold someone to is better. **Ask about method.** Source removal under negative pressure is the standard — a truck-mounted or HEPA-filtered portable vacuum connected to the trunk line. If the answer is a shop vac at each register, that's a different service than the one you think you're buying. **Ask for before-and-after photos.** You cannot inspect the inside of a duct run. Photos are the only verification available to you. **Be skeptical of extremely low advertised prices.** A whole-house special that seems impossibly cheap generally is — the number gets you an appointment, and the actual price appears once the crew is in your basement. ## What to do with an answer you don't like If a contractor isn't in the directory, that isn't automatically disqualifying — plenty of competent small operators aren't members. What matters is whether they *claimed* to be. A company that advertises a credential it doesn't hold has told you something about how it does business, and you learned it before hiring them rather than after. ## Where we stand We're a NADCA-certified company serving Western Massachusetts and Northern Connecticut, and we're listed in the directory under our own name. Look us up. We'd rather you check than take our word for it — and we'd rather you check on everyone you're considering, including the other quotes on your kitchen table. If you want to talk through what a proper cleaning of your system should include before you make a decision, call us. That conversation doesn't obligate you to anything.