Why verification belongs before the visit
A duct cleaning technician enters your home, opens panels, handles equipment attached to your electrical supply, moves powerful vacuums and brushes through the duct system and sometimes climbs into your attic. That is a meaningful amount of access and trust. A short round of checking before the appointment is a sensible step, and it takes less time than most people expect.
Verification is also a protection for the honest company. A business that is properly set up has nothing to hide and usually welcomes the chance to show its paperwork. A company that deflects simple requests, or answers with confident statements but nothing you can look up, has told you something important before any work has started.
This page does not assume that any particular provider is trustworthy or untrustworthy. It gives you a method. The method is to ask clear questions, look up what can be looked up in public records, request documents instead of promises and write down the answers. The approach fits the evidence-first idea that runs through the rest of this site, from how inspections are done in how a duct inspection works step by step to how choices are made in how to choose a duct cleaner.
Start with the questions you can ask on the phone
Verification begins with a conversation. When you call, ask who the company is, what its legal business name is and where it is registered. Ask whether the technician who comes to your home is an employee of the company or a subcontractor, and whether that person has done this type of work before. Ask what the visit will involve, how findings will be recorded, and how the job is priced and approved.
Listen to how the answers are given. Clear, specific replies are a good sign. An answer that changes depending on how you ask, or that leans on vague phrases such as fully certified, top rated or the best in the area without anything behind them, deserves a follow-up question. Ask what the phrase refers to and where you could confirm it.
Pricing questions follow the same logic. Quotes for this kind of work are given by phone after the situation is described, and complicated jobs need an on-site visit. There is a service call charge, and a reputable company explains it before dispatching anyone. Be wary of any arrangement where the price is unclear until the technician is in your home and the system is already opened up. The reasoning behind phone quotes is explained in why quotes are given by phone.
Business registration: confirming the company exists
The simplest public check is whether the business is registered. In Florida, companies that operate as corporations or limited liability companies are listed with the state, and the records are searchable online through the state's Division of Corporations. You can look up the business name and see whether it is active, when it was registered and who the registered agent is. This is not a measure of quality, but it confirms that the entity exists and is in good standing.
Counties and municipalities also have their own business registration requirements, often called a local business tax receipt. Ask whether the company holds one for the area where it works, and for a copy if you want to see it. Requirements vary between cities, so the question should be framed generally: what local registrations does your company hold for working in my city?
Compare the name on the paperwork with the name on the truck, the invoice and the website. Companies sometimes operate under a trade name that differs from their registered name, which is not unusual, but the connection should be explainable. If the names do not line up and no one can explain why, take that as a reason to keep asking. A physical business address, a working phone number and an email at a company domain are modest but useful signs of a real operation.
Trade credentials: asking which ones apply
Credentials in this field are not all the same, and it is easy to be confused by an alphabet soup of names. Some are state or county credentials tied to trades such as HVAC contracting. Others are industry training programs run by trade associations, and holding one shows that a person completed a course or an exam, not that the work on your job will be good. Be careful with both ends of the claim: a credential means something specific, and not more.
A fair way to ask is: which credentials apply to the work you will do in my home, who holds them, and how can I confirm them? If an HVAC contractor is going to open equipment, adjust components or make repairs, ask whether the person doing it holds the credential the state requires for that work, and ask for the number so you can look it up. State agencies that oversee construction and trade professions typically provide a public search where you can check status and any recorded complaints.
Do not assume a credential covers everything. A person who is credentialed for one trade may not be credentialed for another, and a company that cleans ducts is not automatically permitted to do mechanical repairs. If the visit could turn up a repair, ask in advance who would perform it and under what credentials. Related questions about what should and should not happen during a visit are in questions to ask during a duct visit.
Insurance: what to ask for and how to read it
Insurance protects you if something goes wrong in your home: a damaged ceiling, a water leak from a disturbed drain line, a broken fixture or an injury on the property. The common types worth asking about are general liability coverage, which responds to damage or injury caused by the work, and workers' compensation coverage, which relates to injuries to the company's own workers. Requirements vary, so you can simply ask what coverage the company carries and whether it will provide a certificate.
A certificate of insurance is a one-page document issued by the insurer or the insurance agent. It names the insured company, the type of coverage, the policy period and the insurer. It is requested through the company's agent, and many companies can send one the same day. Condominium associations and property managers routinely require a certificate that names the building or association as a certificate holder, so if you manage property, say so when you call.
Read the document for basics. Is the name the same as the company you are hiring? Is the policy period current? Is the type of coverage something relevant to the work? You do not need to evaluate the policy limits like an insurance professional. If something looks off, ask the issuing agent or insurer directly using contact details printed on the certificate, not details supplied by the company. Never accept a verbal promise of coverage as a replacement for paperwork, and never assume an insurance card in a truck window is the same thing.
Reviews, references and what they can and cannot tell you
Online reviews are easy to find and hard to interpret. A star rating is a summary of a mix of experiences, and some reviews describe an unrelated service, a different company with a similar name or a one-time dispute. Read a range of them, paying attention to patterns rather than the best and worst ratings. Look for comments that describe the specific kind of work you need and how the company handled questions, documentation and problems.
Be careful with review counts and star averages as proof of quality. They are one input among several. Reviews can be incomplete, outdated or influenced by factors that have nothing to do with the work itself. They are best used to confirm that real customers exist and to spot repeated complaints about the same issue, such as unclear pricing or incomplete documentation.
References can be more informative. Ask whether the company can put you in touch with a property manager, condo board or past homeowner who has had similar work done, and with the customer's permission, ask a few plain questions: Was the visit documented? Did the price match what was explained on the phone? Were findings shown to you? Did the company fix anything that went wrong? Photographs of past work can also be requested, but remember the cautions in how to read before and after duct photos.
Red flags that deserve a pause
Certain patterns are worth a pause, whichever company shows them. High pressure to decide on the spot, a story that the problem is urgent and dangerous without evidence you can see, and a price that arrives only after a long sales presentation are all reasons to slow down. So is an unusually low advertised price that grows as the visit goes on, the inability to explain the method, or reluctance to put findings in writing.
Claims about health also deserve care. No reputable provider should promise that duct cleaning will cure an illness, remove all allergens or always improve air quality, because the evidence for such claims is limited and depends on the home. The honest position is that cleaning removes visible contamination and may help in specific situations, and the decision should rest on what is found. Public guidance on this topic is summarized in the EPA's duct cleaning guidance in plain words.
Other signals include a technician who will not give a full name, a vehicle with no company identification, a request for payment in an unusual form before work begins, or an unwillingness to let you watch. A common list of such patterns is discussed in red flags in duct cleaning offers. A single flag is not proof of wrongdoing. Several together are a good reason to stop and look elsewhere.
Extra steps for condos, landlords and commercial properties
If you manage a building, answer to a board or own rental property, verification carries more weight because other people depend on the outcome. Associations commonly set their own rules for vendors: proof of insurance with the association named as a holder, a signed access agreement, advance notice to residents, limits on working hours and rules about elevators, parking and common areas. Ask the building office what is required before you book, and pass those requirements to the company when you call, so nothing is discovered at the door.
Residents of a condo unit should also ask whether the work stays inside the unit or touches shared risers, roof equipment or common corridors. A unit owner usually controls the ducts serving only that unit, while shared components belong to the association. Hiring someone to work on a shared system without the board's approval can create trouble for everyone. Related thinking is in the HOA and condo board duct guide.
For commercial spaces, add questions about scheduling around business hours, protecting equipment and records, and documenting each area that was serviced. A numbered list of locations with matching photographs makes the record easier to audit later, and it helps a property manager show owners and tenants what was done.
Keeping a record of what you verified
Write down what you checked, when you checked it and what you found. A simple note is enough: company name, phone, the date of your call, the names of people you spoke with, the registration search result, the credential numbers provided, the insurance certificate date and any promises that were made. If a dispute ever arises, a dated record of what you were told and what you confirmed is far more useful than your memory.
Save copies of the written estimate, the findings report and the final invoice with the certificate of insurance and any photos. Keep them where you can find them, in a folder on your phone or a printed set. If you rent or manage property, share a copy with the owner or the board as required. Habits for organizing this material are covered in keeping your own duct records.
Remember also to verify the person at the door. Ask the technician to confirm the company name and the purpose of the visit, and compare it with what you were told on the phone. You are allowed to pause the visit and call the office if something does not match. A professional will understand, because the same care protects everyone involved in a job done inside a private home.
Applying this to any company you call
The same checklist applies whether you are calling one company or comparing three. Ask the same questions of each, note the answers side by side and give weight to evidence you can verify yourself. Differences in how openly they answer are often more revealing than differences in how confidently they speak.
Be consistent about the service call charge and phone quotes too. Ask each provider what is included, what happens if the visit finds nothing that needs cleaning, and how a recommended job is approved. Compare scope and method, not only the numbers they give you by phone. A narrower job with clear documentation can be a better fit than a broad job described in general terms.
When you are ready to move ahead, call and describe the situation, then ask for the details described on this page. Have your questions written down, your property access arranged and, if someone else owns or manages the property, their requirements for insurance paperwork ready. A prepared caller gets a clearer answer, and a clear answer is the beginning of a visit you can trust.
Questions people ask
What should I ask a duct cleaning company before booking?
Ask for the legal business name, who will come to the home, what the visit will include, how findings are recorded and how the job is approved. Ask which credentials and insurance apply and how you can confirm them. Write down the answers. Clear, specific replies you can check are a better sign than confident general claims.
How do I check that a company is registered in Florida?
The state's Division of Corporations offers a public online search where you can look up a business name and see whether it is active. Cities and counties may also require a local business tax receipt. Registration confirms the company exists, but it is not a measure of work quality, so use it alongside other checks.
Should I ask for proof of insurance?
Yes. Ask what coverage the company carries and request a certificate of insurance, which its agent can usually send quickly. Check that the company name matches, the policy period is current and the coverage type is relevant. Condo associations and property managers often require a certificate that names them as a holder.
Does a training certificate mean the work will be good?
Not by itself. A training program or exam shows that a person completed something specific, and it is a point in favor. It does not settle the quality of work on your job. Ask what the credential covers, who holds it and how you can look it up, then judge the visit by the evidence it produces.
Are online reviews enough to trust a company?
They are one input. Read for patterns about documentation, pricing clarity and how problems were handled, and keep in mind that reviews can be incomplete or mixed up with other businesses. References from a past customer or property manager, with their permission, can add more detail.
What if a company will not provide documents?
Take it as useful information and ask once more, politely and in writing if you can. If documents still do not arrive, consider another provider. When you are ready to compare options, call and ask each company the same questions about credentials, insurance and how findings are recorded.
Describe the situation by phone and we will tell you what the job involves. Quotes are given by phone. Jobs that cannot be quoted without seeing them need a technician on site, and the service call charge is explained on the phone before anyone is dispatched.
Related pages
- Choosing a Cleaner: How to tell a careful duct cleaner from a rushed one: evidence shown first, method explained, scope in writing, and conduct that respects your decision.
- Red Flags: Pressure tactics, vague scope and claims that go beyond the evidence: the warning signs to spot in a duct cleaning offer before you hire anyone.
- Questions to Ask: The questions that bring scope, method and findings into the open while the technician is still at your home, with what a good answer sounds like.
- Phone Quotes: Why duct cleaning scope questions come before any price, why quotes are given by phone and not by web form, and when a complex job needs an on-site visit.
- EPA Guidance: A plain reading of public EPA guidance on duct cleaning: when it may be warranted, when it is not routinely needed, and why evidence should come first.
- Mold or Dust: Dark spots on a register are often dust, not mold. Learn the visual and contextual clues that separate ordinary dust from suspect growth, and their limits.