10 Questions to Ask Before Hiring a Duct Cleaning Company

Before hiring a duct cleaner, ask: Are you NADCA-certified? Do you use commercial-grade equipment? Will you show before-and-after camera footage? What is included in the price? These four questions eliminate 90% of scam operators.

The 10 Essential Questions

Austin has more duct cleaning companies than most cities its size, and at least a third of them will not meet basic industry standards. We see this constantly across neighborhoods from Mueller to Crestview to Round Rock - companies running ads on Nextdoor with no credentials and a shop vac in the trunk. Before you let anyone touch your HVAC system, ask these ten questions - the answers will tell you immediately whether you are dealing with a professional or a scam operator.

1. Are you NADCA certified or do you follow NADCA guidelines? - The National Air Duct Cleaners Association sets industry standards. Companies that follow these guidelines use proper equipment and procedures. A red-flag answer sounds like: 'We do not need certification - we have been doing this for years.' Experience without standards means nothing if the process is wrong.

2. Do you use commercial-grade or portable equipment? - Commercial-grade systems generate 10,000-15,000 CFM of suction and connect to your main trunk line, creating negative pressure throughout the entire duct system. Portable units generate 100-200 CFM - barely enough to clean a single vent opening. If they say 'We bring everything we need in our van,' ask specifically about the vacuum specs. A commercial-grade unit will not fit in a standard work van - it is typically mounted on a trailer or brought in as a large standalone unit.

3. Will you show me before-and-after camera footage? - Any legitimate company will let you see inside your ducts before and after. If they refuse, walk away. Red-flag answer: 'We do not use cameras - you will be able to tell the difference.' Without footage, you have no way to verify work was actually done throughout the system.

4. What exactly is included in the quoted price? - Get specifics: number of vents, returns, main trunk lines, dryer vent, and whether the air handler/blower unit is included. Red-flag answer: 'We will assess once we get there.' A legitimate company can give you a firm quote based on the number of vents and your home size.

5. How long will the job take? - A legitimate whole-home cleaning takes 3-5 hours. Anyone quoting 1-2 hours is cutting corners. 6. Do you charge per vent or a flat rate? - Per-vent pricing often leads to surprise charges. Flat-rate quotes for the whole system are more transparent.

7. Will you use chemicals, sealants, or antimicrobial treatments? - These are rarely necessary and often upsold at high markups. Ask if they are optional. A red-flag answer: 'We recommend treatment for every home.' Legitimate companies only recommend treatments when camera inspection shows a specific problem that warrants it.

8. Are you licensed and insured? - Verify they carry liability insurance that covers potential damage to your HVAC system or home. Ask for a certificate of insurance, not just a verbal yes. 9. Can I see recent reviews or references? - Check Google reviews (not just their website testimonials). Look for consistent quality over dozens of reviews, not just a handful of perfect scores. 10. What is your guarantee? - A reputable company stands behind their work and will come back if you are not satisfied.

Red Flags That Signal a Scam

The classic bait-and-switch: a company advertises an attractive price, then once the technician is in your home, they 'discover' problems and the final bill balloons to $800-$1,500 in supposedly required add-ons. The way to spot these operators is their behavior - they use portable equipment instead of commercial-grade vacuums, spend under an hour on a whole home, push chemical treatments as mandatory, and will not show you camera footage of your actual ducts.

Pressure to add chemical treatments, duct sealing, or antimicrobial coatings. Claims that dirty ducts are causing health emergencies. Technicians who arrive without a commercial-grade vacuum. Companies that will not provide a written estimate before starting work. Also watch for companies that cold-call or go door-to-door - legitimate duct cleaning companies in Austin have enough business through referrals and online presence that they do not need to canvass neighborhoods.

How to Compare Quotes in Austin

Get at least two to three quotes before booking. When comparing, make sure each quote covers the same scope: all supply vents, all return vents, main trunk lines, and the air handler/blower unit. Some companies quote a lower price by excluding returns or the blower, then add those as extras on the day of service.

In the Austin market, pricing for a standard home with 15-25 vents is competitive across reputable companies. Larger homes or homes with multiple HVAC systems will cost more. If one quote is dramatically lower than the others, that company is either using portable equipment, spending less time, or planning to upsell you once they are in the door. Trust the middle of the range and verify the equipment and process match what they promise.

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