FOR HOUSTON HOMEOWNERS A 5-minute, 5-test air quality audit

Don't pay anyone to clean your ducts until you've run these five tests.

A flashlight, a clean cotton cloth, and five minutes is all this takes. By the end you'll know with certainty whether your Houston home needs a duct cleaning right now, or whether you can wait another two years. It's the most honest air-quality audit you'll find on the internet, written by people whose business depends on you saying yes, and willing to tell you no anyway.

Run the 5 tests Save as PDF

5 min to run, start to finish Built on NADCA + IICRC standards Houston-specific, not generic

5.0 Google Rating, 74 verified reviews

Locally ownedHouston, TX · founded 2023

Pro-Fresh Houston · Co-Founders

Why this checklist exists

We've inspected over a thousand Houston duct systems. Roughly half of them didn't need a cleaning.

Tiffani has been doing this for more than a decade. Nathan came over from running Houston restaurants, where you don't get a second chance on cleanliness. The reason we built this checklist is simple: the air-duct industry has a credibility problem, and the only fix is to be the company that tells you the truth, even when the truth is "you don't need us yet." If five minutes of your time saves you from a $99 bait-and-switch or, worse, from ignoring a real problem, that's a fair trade.

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Two fields. The full audit on the next screen.

First name and email. The five tests appear on the next scroll, plus a clean printable PDF in your inbox. One short follow-up a few days later asking if you have questions. After that, silence unless you ask. We don't sell, rent, or share lists. You can unsubscribe with one click.

I. The five tests

Run all five. Score one point for each yes.

No interpretation needed yet, just a yes or no for each. We'll tell you exactly what to do with your score in section II.

01The vent test

The cotton cloth comes back grey or black.

Pull a return-side vent cover off, the bigger one. Reach in with a clean white cotton cloth, six inches deep. Wipe the inside wall of the duct in two slow passes. Pull the cloth out and look at it under window light.

White or pale grey is normal house dust, fine. Dark grey turning to black is a problem. What you're seeing is years of pet dander broken down to powder, candle and cooking soot pulled through unsealed return paths, and in Houston, the leading edge of microbial growth where humidity meets cool metal. Whatever's on that cloth is what your HVAC has been pushing into your bedrooms every six minutes.

How to run it (90 seconds)One Phillips screwdriver, one clean cotton cloth (an old white t-shirt works), one return register near the air handler. Wipe twice. Don't reach past your first knuckle. Wash hands. Photograph the cloth so you have it for comparison after a cleaning.

If yes — mark one point.Black or dark-grey particulate inside the duct is the single most common finding on calls we end up taking. It's also the easiest one to verify yourself.

02The first-minute test

You can smell the AC come on.

Drop the thermostat two degrees. Stand within arm's reach of any return vent. Wait for the air handler to kick in — about thirty seconds — and breathe through your nose for the first sixty seconds of airflow.

Fresh, neutral, slightly metallic is normal. Damp basement, wet sock, or that weirdly sweet "old gym bag" smell is moisture in your evaporator coil pan or your trunk lines. In a Houston summer, that smell goes from "huh" to mold colony in roughly two weeks of running. It's the single fastest-developing problem on this list, and it's the one most homeowners normalize because they smell it every day.

How to run it (2 minutes)Lower thermostat 2°F. Within thirty seconds the system kicks on. Sniff the first minute of airflow at the closest return. Don't run scented candles or air fresheners that morning, they'll mask it. Trust your nose, not the air freshener.

If yes — mark one point.A musty first minute means moisture is sitting where it shouldn't. In Houston that's a 60 to 90-day window before microbial growth becomes visible to a borescope.

03The body test

You feel worse inside your house than outside.

Track yourself for three days. Same medications, same sleep, same diet. Note your symptoms after thirty minutes indoors and after a ten-minute walk in the neighborhood. Eyes, throat, sinuses, that low-grade headache that sits behind your forehead.

If outside is the relief and inside is the trigger, your indoor air is doing something the Houston air isn't. The usual suspects: oak and cedar pollen tracked in on shoes and pets getting recirculated through return paths, dust mite waste from carpet blown back into bedrooms, mold spores from a humid coil pan. Most people blame Houston allergens for what's actually concentrating inside their own walls.

How to run it (3 days, low effort)Don't change anything else for three days. Note symptoms three times a day on a 0–10 scale, indoors and outdoors. If indoor numbers are consistently a point higher than outdoor, that's your answer.

If yes — mark one point.Indoor-only symptoms point to recirculating allergens. New filters help for about a week. Cleaning the source helps for years.

04The recent history test

Renovation, water event, or new pet in the last six months.

Did you remodel a kitchen or bathroom, refinish hardwoods, drywall a room, or take on any project that involved sanding, sawing, or demolition? Did you have a roof leak, sweating coil, slab leak, or storm-driven intrusion, even one a restoration company said was "fully resolved"? Did you adopt a high-shedding dog or move in with a partner whose pet did?

Each of these multiplies what's in your ducts by an order of magnitude. Construction dust is so fine it bypasses standard filters and settles in the trunk lines. Water events seed microbial growth that takes 30 to 60 days to become visible. Heavy shedding overwhelms a 1-inch filter in days, and what doesn't get caught at the filter ends up in your ducts.

How to run it (1 minute)Open your photo roll, scroll back six months. Anything that looked like construction, water, or a new four-legged family member, mark yes. NADCA recommends post-event inspection regardless of whether the visible cleanup was thorough.

If yes — mark one point."Already cleaned up" almost always means cleaned up above the floor. The duct system runs through the attic and below, where nobody looked.

05The calendar test

It's been more than three years — or you can't prove it has been less.

NADCA's recommended interval is three to five years for a typical Houston home, and one to three years for households with pets, allergies, smokers, or anyone with respiratory sensitivity. That clock starts at the last full duct cleaning with photo documentation. Filter changes don't reset it. Vacuuming the registers doesn't reset it. A handyman blowing out the lines doesn't reset it.

If you bought your house in the last few years and the previous owner didn't hand you receipts, treat it as never. If you paid for a cleaning but nobody took before-and-after photos, treat it as never. Memory is generous on this. The duct system isn't.

How to run it (5 minutes)Search your email for "duct," "HVAC," "cleaning," and the year you moved in. Check the binder where you keep house records. If you can't produce a dated receipt or photos in five minutes, mark yes and move on.

If yes — mark one point.Houston HVAC systems run more hours per year than systems anywhere else in the U.S. mainland. The 3-year mark hits faster than the calendar suggests.

The 5 tests at a glance

01 Vent test 02 First-minute test 03 Body test 04 History test 05 Calendar test

II. Score yourself

Add up your yes answers. Read the matching card.

0–1

You're fine. Don't pay for a cleaning.

Your system is doing its job. Stay on a 90-day filter schedule (60 days if you have pets), get the AC tuned annually by your HVAC tech, and run this checklist again every spring. Save your money. Anyone who calls you and says you need a cleaning right now is wrong, and is probably the kind of cleaner this checklist warns about.

2–3

You're on the line. Get an inspection.

Something is starting to show. The right next step is a free pre-clean borescope inspection, where we send a camera into your trunk lines and you see what's actually there before deciding anything. Photos go to your inbox the same day. If the camera says wait, we say wait.

4–5

Don't wait. Book the cleaning.

Your HVAC is recirculating something it shouldn't, hour by hour, into your bedrooms and living spaces. NADCA-protocol cleaning, photo-documented, typically 4 to 6 hours on site for a 2,500 sq ft home. We book within 48 to 72 hours, with same-week availability for urgent cases. Itemized quote in writing before we start.

III. What to avoid

If a Houston duct cleaner pulls any of these, walk away.

Our industry has a credibility problem, and most of the bad actors run the same playbook. If you can spot it from across the room, they can't run it on you. Memorize these four. There's no "free trial" of falling for them.

The "$99 whole-house special." NADCA-protocol cleaning of a 2,500 sq ft home is two trained techs, four to six hours on site, HEPA-rated negative-air equipment, and consumables. The math on $99 doesn't work. They're not losing money, they're betting they can sell you $1,400 of "extras" once they're inside, things you don't need and can't verify.

The "look what we pulled out!" demo. A tech sticks a hand into your vent during a free inspection and produces a fistful of black gunk, gasping like he's never seen anything like it. He has. He brought it from the truck. Real inspection evidence comes from a borescope camera with date-stamped photos you keep, not from theater.

"You have mold." (Five minutes in, no test.) Confirming microbial growth requires either lab-tested swabs or visible-with-source identification by a trained eye, not a hunch from a kid who was driving the van last week. Anyone selling you mold remediation in their first conversation is selling fear, not service. Ask for the test. Watch them stammer.

No certifications, no insurance, no documentation. Both NADCA and IICRC let you verify a company's standing in 60 seconds online. If a cleaner can't or won't show you a member ID, a certificate of insurance, and before-and-after photos from past jobs, the answer is no. There's no scenario where it's worth the risk.

Pro-Fresh showed up to my residence on their scheduled time and handled a problem my family has been struggling with for a while. Pinpointed the problem in less than 15 minutes and got to work. Effortless and seamless.

Abraham Curiel Houston Homeowner

Verified Google review · one of 74

IV. When you're ready

The honest answer, even when it's no.

If your score said get an inspection, get one from us. We'll send a borescope camera into your trunk lines, photograph what's there, and email you the file the same day. If the photos say wait, we say wait. We'll tell you when to call back.

Request a free inspection or call (713) 632-4949