What to Expect During a Professional Air Duct Cleaning

A professional air duct cleaning service shouldn't be a mystery purchase. You invite a crew into your home, they spend a few hours with your HVAC system, and you're supposed to trust that something valuable happened inside walls you can't see into. We built our whole process around removing that leap of faith. Here's exactly what happens when you book with Green Air Duct Club in San Antonio — the same process whether you're in a garden home in Alamo Heights or a two-story in the suburbs.

Step 1: Booking (Two Minutes)

Call (210) 790-3600 or use the booking form, and you'll get a confirmed appointment window — same-day slots are often available across San Antonio and Bexar County. We'll ask how many AC systems your home has (one system is one air handler and everything connected to it), roughly how many vents, and whether you've noticed anything specific — dust, odors, allergy flare-ups. That's it. No deposit, and the price for the cleaning itself is already known: a flat $99 per system. You can also book the $99 special directly online.

Step 2: Arrival and the Free Inspection

Our technician arrives in a marked Green Air Duct Club van, in uniform. Before any cleaning equipment comes out, we inspect the system: registers come off, a camera and light go into the duct runs, and we check the coil, the filter's condition, and airflow. Then we show you the photos. This step matters more than any other, because it sets an honest baseline — you see the actual condition of your ducts, and if a system genuinely doesn't need cleaning, we say so and the visit costs you nothing. If it does need it, you know exactly what the crew will be removing, and the flat price is confirmed in writing before work begins.

Step 3: Setup and Sealing

With the plan agreed, the crew protects the work areas, removes the vent covers, and seals the registers. Then the heart of the operation arrives: a commercial negative-air machine — essentially a very powerful, HEPA-filtered vacuum — is connected to your duct system near the air handler. When it switches on, the entire duct network goes under negative pressure, meaning air flows inward toward the machine from every vent. Anything loosened inside the ducts from that moment on travels one direction only: out of your walls and into our equipment, not into your rooms.

Step 4: The Cleaning Itself

Working vent by vent, the technician feeds rotary brushes and compressed-air tools into each run while the negative-air machine pulls debris out. This is the slow, thorough part — supply runs, return runs, and the main trunk lines all get worked through, because cleaning only the easy vents near the handler is how cheap jobs cut their corners. The coil and filter get their health check along the way, and if the crew finds anything beyond cleaning — a disconnected duct, damaged insulation, signs of mold — they document it with photos and discuss it with you before doing anything about it. No surprise work, ever.

Step 5: The Dryer Vent, If You Added It

Many customers add dryer vent cleaning to the same visit for $79. While the duct work wraps up, the dryer is disconnected, the full vent line is brushed and cleared to the exterior exit — including roof caps, which are common in San Antonio — and airflow is verified at the outside vent. One appointment, both systems handled.

Step 6: The Photo Report — Then You Pay

When the cleaning is finished, the technician walks you through the before-and-after photos of your own ducts, vent by vent if you like. This is your verification: the same angles you saw during the inspection, now clean. Only after you've reviewed the report and you're satisfied does payment happen — that's been our rule since 2009, and it's why our customers in Alamo Heights, Bulverde, and all over the metro rate us 4.9 stars. The crew replaces every register, removes their equipment, and leaves the house as they found it.

After the Visit

Most people notice two things in the first week: the house dusts up more slowly, and the air when the system kicks on smells like nothing at all — which is exactly what it should smell like. To keep it that way, change your filter on schedule and put the next cleaning on a 3–5 year horizon (our guide on how often to clean your ducts explains the rhythm). And if anything about the job ever concerns you, call us — making it right is part of the deal.

How to Prepare (Five Minutes, Tops)

There's very little you need to do before we arrive. Clear small items away from the floor registers and wall vents so the crew can reach every one. Make sure the air handler — usually in an attic, garage, or closet — is accessible, and move anything fragile stored right in front of it. Decide where the pets will spend a few hours; a closed bedroom or the backyard works, since doors open frequently and the equipment is loud. If there's a specific concern — one room that's always dusty, a vent that smells, a bedroom where someone wakes up congested — mention it when the technician arrives, because those details genuinely help the crew know where to look hardest. That's the whole list. You don't need to deep-clean your house for the duct cleaners.

Questions Worth Asking Any Company You Hire

• "Will I see photos of my own ducts before and after?" If the answer is no, you have no way to verify anything.
• "Is the price flat and in writing before you start?" Per-vent pricing that gets counted on-site is where quotes go to grow.
• "What equipment do you use?" You want to hear about negative-air machines and rotary brushes, not a shop vacuum and a leaf blower.
• "Do you clean the returns and trunk lines, or just the vents?" Partial cleaning is the most common corner cut in this industry.
• "When do I pay?" After the work, with the results in front of you, is the right answer.

We built our process to answer all five the way you'd want — and we're happy to be measured against any company that answers them differently.

Keep the Photo Report

One last piece of advice: don't throw the photo report away. Save it with your home records the way you'd keep a roof invoice or an AC repair receipt. It documents the condition of a system nobody can see into, which makes it useful in more places than you'd expect — answering a buyer's questions when you sell the home, showing a landlord or tenant the state of the system at move-in, supporting a warranty or insurance conversation after a dust or smoke event, and simply reminding yourself, three years from now, exactly when the last cleaning happened and what the ducts looked like. Most home maintenance leaves no evidence behind. This one does, and it's part of what you're paying for.

Ready to See Inside Your Own Ducts?

The inspection is free, the photos are yours to see either way, and the cleaning is $99 per system with unlimited vents. Call (210) 790-3600 — we're open 24 hours, and same-day appointments are often available.