What to look for in an air duct cleaning company
A good air duct cleaning company will show you their credentials upfront, charge a flat rate before they start work, and explain what they're actually cleaning. Many companies advertise low prices to get in the door, then add charges once they see your system. The ones worth hiring are transparent about what the job includes, won't pressure you into extras, and can tell you specifically which parts of your ductwork they'll access and clean.
Start by checking whether the company holds a current license in your state—requirements vary, but many states require HVAC contractors to be licensed. Ask for references from recent jobs in your area, and call at least two of them. A reference should be able to tell you whether the technician showed up on time, explained the work clearly, and left the space clean.
The company should also carry liability insurance and workers' compensation coverage. Ask to see proof before they enter your home. If they can't produce it or seem annoyed by the question, move on.
Key Takeaways
- Request a written estimate that lists the total cost and specifies which ducts and equipment will be cleaned before any work begins.
- Verify that the company holds a current state license for HVAC work and carries liability insurance and workers' compensation coverage.
- Call at least two customer references and ask whether the technician was punctual, explained the work, and cleaned up afterward.
- Avoid companies that quote prices over the phone without seeing your system or that pressure you into add-on services like chemical treatments.
- Check online reviews on Google, the Better Business Bureau, and Yelp, but weight recent reviews more heavily than older ones.
How to get and compare written estimates
Never hire a company based on a phone quote. A technician needs to see your ductwork, furnace, and air handler to give you an honest price. When you call, ask whether they charge for the in-home estimate—most reputable companies do not, but some do, and you should know upfront.
During the estimate visit, the technician should walk you through your system and explain what they can and cannot access. Some ducts run behind walls or under concrete, and a good company will tell you that honestly instead of promising to clean everything. They should also tell you how long the job will take and whether they'll need to turn off your system during the work.
Get at least three written estimates. Compare them line by line—if one is significantly cheaper, ask why. It might be because they're cutting corners on equipment, using fewer technicians, or skipping steps like sealing leaks. A price that's much higher might mean they're including services you don't need.
Red flags that mean you should look elsewhere
Walk away if a company quotes a price over the phone without visiting your home. They have no way to know the size of your system, how accessible your ducts are, or how much work is involved. A low phone quote is often bait—they'll find reasons to charge more once they arrive.
Avoid companies that push chemical treatments, sealants, or antimicrobial coatings as part of the cleaning. These add-ons are expensive and their benefit is not proven. Some companies also use high-pressure air or chemicals that can damage ductwork if done incorrectly. Stick with mechanical cleaning—brushes and vacuums—unless a technician can explain a specific reason your ducts need something more.
Be skeptical of companies that may provide your allergies will improve or your energy bills will drop. Duct cleaning may help with airflow and dust, but it's not a cure for allergies, and the energy savings are usually small. If a company makes these promises, they're overselling the service.
Do not hire someone who shows up without a uniform, vehicle branding, or business cards. Legitimate companies invest in their image. Also skip anyone who asks for cash payment or a large deposit before the work is done.
How to check reviews and complaints
Search the company name on Google, Yelp, and the Better Business Bureau website. Read recent reviews—those from the last six months matter more than older ones, since a company's quality can change. Look for patterns rather than single complaints. One person saying the technician was late is not a red flag; five people saying the same thing is.
Pay attention to how the company responds to negative reviews. A good company will acknowledge the problem and explain what they did to fix it. A company that ignores complaints or argues with customers is showing you how they handle problems.
Check the Better Business Bureau for unresolved complaints. If a company has multiple complaints that they never responded to, that's a sign they don't stand behind their work. The BBB also lists how long the company has been in business—newer companies are not automatically worse, but longevity suggests they've kept customers satisfied.
Questions to ask before you hire
Ask the technician what equipment they use. Truck-mounted vacuum systems are more powerful than portable ones and remove more dust from your ducts. Ask whether they use negative pressure—meaning they seal your ducts and create suction to pull debris out—or positive pressure, which can push dust deeper into your system if done wrong.
Find out whether they'll seal any leaks they find during cleaning. Leaky ducts waste energy and pull in unconditioned air. Some companies charge extra for sealing; others include it. Either way, you should know the cost before they start.
Ask how they'll protect your home during the work. They should lay down drop cloths, use plastic sheeting to seal off work areas, and have a plan for dust and debris. If they can't describe this clearly, they probably won't be careful about it.
Request a written summary of what they cleaned and any problems they found. This gives you a record of the work and helps you decide whether to get your ducts cleaned again in the future.
When to get your ducts cleaned
Most homes do not need duct cleaning every year. The EPA recommends cleaning when you notice visible dust or debris coming from your vents, after construction or renovation work, or if you've had water damage or pest problems. If you have pets, allergies, or live in a dusty area, you might clean every three to five years. If your ducts are in good shape and your home is clean, you may only need it once a decade.
Get your ducts cleaned before you have your furnace or air conditioner serviced. Dust in the ducts can settle on the equipment and reduce its efficiency. A clean system also helps the technician see any problems with the equipment itself.
Frequently Asked Questions
How much does air duct cleaning usually cost?
Prices vary widely depending on the size of your system, how accessible your ducts are, and where you live. Most companies charge between $300 and $1,000 for a whole-house cleaning. Get multiple estimates and compare what's included—some companies charge per vent, others charge a flat rate for the whole system.
Can I clean my own air ducts?
You can vacuum the registers and return vents yourself, but you cannot reach the main ducts without professional equipment. Trying to push a brush or hose into your ductwork without proper training can damage the ducts or push debris deeper into the system. Professional cleaning is worth the cost if your ducts are visibly dirty.
Will duct cleaning improve my air quality?
Duct cleaning removes dust and debris, which can reduce the amount of dust circulating through your home. It may help if you have pets or live in a dusty area, but it won't cure allergies or asthma. If air quality is your main concern, a good furnace filter and regular filter changes will help more than duct cleaning.
How long does a duct cleaning take?
Most jobs take two to four hours, depending on the size of your system and how accessible your ducts are. The technician should tell you the expected time during the estimate visit. Ask whether they'll need to turn off your system during the work and whether you can run it again when ready after.
Should I get my ducts sealed after they're cleaned?
If the technician finds leaks, sealing them will improve your system's efficiency and prevent dust from being pulled in from unconditioned spaces like attics or crawlspaces. Ask the cost upfront and whether it's included in the cleaning price. Sealing is worth doing if you have significant leaks, but it's not necessary for every system.