Whole-home duct cleaning
Dryer vent cleaning
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Sanitizing & deodorizingWhole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
That "$99 whole-house special" is a bait ad - the real number appears once they are in your hallway, or the "clean" is a shop-vac at the register. We photograph the inside of your ducts before and after instead.
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AfterHow Much Does Air Quality & Sanitizing Cost in Alpharetta?
Air quality and sanitizing services in Alpharetta typically run between $295 and $895 for a standard single-family home, with most homeowners paying around $495 for a full-system treatment that covers the ductwork, coils, and blower assembly. Smaller jobs, like treating a single HVAC unit in a condo or townhome, start around $195, while larger homes with multiple systems or heavier contamination can push toward $1,200 or more. Hollis Air Duct Alpharetta gives every customer a written price before any work begins, so the number you’re quoted is the number you pay.
Air Quality & Sanitizing Cost Breakdown (2026)
Here’s what Alpharetta homeowners can expect to pay for the most common air quality and sanitizing services this year. These ranges reflect local pricing for the Alpharetta and North Fulton market, where homes range from 1970s ranches in Northwind to newer builds in Avalon and Windward.
| Service | Typical Price Range | What It Includes |
|---|---|---|
| Single HVAC unit sanitizing | $195 – $325 | Coil and blower treatment, one return and supply plenum |
| Full duct system sanitizing | $350 – $650 | Complete supply and return ductwork, coils, blower, and plenums |
| Air quality package with duct cleaning | $495 – $895 | Full negative-air duct cleaning plus sanitizing application |
| Whole-home UV light installation | $450 – $900 | UV lamp, mounting, and electrical tie-in at the air handler |
| Dryer vent sanitizing | $95 – $185 | Vent line treatment after a cleaning, if not bundled |
| Odor treatment (smoke, pet, or mildew) | $250 – $550 | Targeted fogging or vapor treatment of affected areas and ductwork |
What pushes the price up in Alpharetta specifically comes down to a few things. Homes with two HVAC systems – common in the larger properties around Crabapple and along the Chattahoochee River corridor – need both units treated, which effectively doubles the equipment-side cost. Access matters too: attics in Alpharetta summers run hot, and if the air handler is squeezed into a tight mechanical closet, the job takes longer. The condition of the existing ductwork plays a role as well. If there’s visible mold growth or heavy organic buildup from years of Georgia humidity, the sanitizing step becomes more involved.
What Affects Air Quality & Sanitizing Pricing in Alpharetta
- Square footage and duct runs. A 1,400-square-foot ranch near Alpharetta City Center has fewer linear feet of duct than a 4,500-square-foot two-story in Windward. More duct means more sanitizing product and more labor.
- Number of HVAC systems. Many Alpharetta homes built after 2000, particularly in neighborhoods like Kimball Bridge and Haynes Manor, have a separate unit for each floor. Each system needs its own treatment.
- Contamination level. Alpharetta’s summer humidity creates condensation inside ducts, which feeds mold and mildew. If the technician finds visible growth during the pre-job inspection, the sanitizing protocol has to account for it.
- Access difficulty. Air handlers in crawlspaces or tight attic corners take longer to reach. Some older homes near downtown Alpharetta have mechanical closets that were never designed for easy service access.
- Sanitizing method. Vapor-based fogging products cost more than basic spray-and-wipe treatments but cover the full duct surface area more completely. UV systems are an equipment cost, not a consumable, so they fall in a different price category.
- Add-on services. Bundling sanitizing with a full air quality and sanitizing service in Alpharetta or a duct cleaning changes the per-service math, usually lowering the combined cost compared to scheduling them separately.
How to Save on Air Quality & Sanitizing
The biggest savings lever in Alpharetta is bundling. If you’re already having your ducts cleaned, adding sanitizing at the same time costs less than a standalone visit because the setup, access, and inspection work is already done. Ask for a written bundled price before you commit.
Timing helps too. Spring and fall are slower seasons for HVAC work in North Fulton. Summer and early winter are peak, when technicians are splitting time between emergency calls and scheduled jobs. You won’t find gimmick discounts, but booking in an off-peak window means faster scheduling and more flexibility.
Replacing your filter regularly – every 30 to 60 days with the Georgia pollen seasons – reduces the contaminant load inside the system. A cleaner system needs less sanitizing product, which can lower the quote. And if you’re comparing bids, ask what product is being used. Cheaper sprays require more frequent reapplication. Hospital-grade fogging products cost more per application but last longer. The cheapest bid is rarely the cheapest over 12 months.
The most direct way to know your number: call (762) 769-7145 for a free estimate. You’ll get a written price before any work starts, and that price does not move at the door.
Air Quality & Sanitizing Methods Explained in Plain Terms
If you’re comparing quotes, you’ll hear a few terms thrown around. Here’s what they actually mean for the air in your Alpharetta home.
Negative-Air Duct Cleaning
A machine with a HEPA-filtered vacuum pulls a vacuum on the duct system while brushes agitate the duct walls. Contaminants get pulled out of the house instead of blown around. This is the method commercial buildings use, and it’s the standard we run on home duct cleaning jobs. Nikro negative-air machines are on our equipment list because they hold up under daily commercial use.
Vapor Fogging and Sanitizing Agents
Sanitizing is not the same as cleaning. Cleaning removes the physical debris – dust, pet dander, construction rubble. Sanitizing treats the surfaces with an antimicrobial product that kills mold spores, bacteria, and odor-causing organisms. Fogging pushes a fine vapor through the entire duct system so it reaches surfaces a spray bottle can’t. The product matters. We use commercial-grade formulations, not shelf products from a hardware store.
UV Light Systems
A UV lamp installed at the air handler or coil continuously exposes passing air to germicidal light, which damages the DNA of mold spores and bacteria so they can’t reproduce. This is an equipment purchase, not a one-time service. Brands we install include Honeywell and Aprilaire. The lamp needs a new bulb roughly once a year, which runs $75 to $150 depending on the model.
Duct Sealing with Mastic
Leaky ducts pull unfiltered air from attics and crawlspaces into the living areas. Duct sealing mastic is a brush-on or spray-on compound that closes seams and joints so air only enters the ducts through the return grille, where the filter can catch it. In Alpharetta, where attics hit 130 degrees in July, sealing ductwork also means your conditioned air isn’t leaking into an oven.
What the 365-Day Done Right Promise Covers
Every job from Hollis Air Duct Alpharetta is covered in writing for a full year. If the sanitizing treatment fails within 365 days – meaning mold returns, odor comes back, or the work wasn’t completed to the standard we quoted – we return and make it right at no charge. That includes a free second visit, which is not a negotiation. It’s the standard. Roy Castellanos runs the operation on The Garrison Standard: arrive inside the quoted window, price in writing, do the job by the book, and leave the site clean. If any of those four things don’t happen, the promise applies.
Why Alpharetta Homes Need Air Quality Work More Than Most
North Fulton’s climate creates conditions that are genuinely hard on HVAC systems. The Georgia heat means air conditioners run from April through October, sometimes November. All that runtime means condensation, and condensation is where mold starts. Homes along the Chattahoochee – around Riverside, for example – carry higher ambient humidity than homes up near Birmingham Falls. That humidity moves through the duct system every time the fan kicks on.
Pollen is another factor. Alpharetta sits in the middle of one of the heaviest pollen regions in the country, with pine and oak counts that spike from late February through May. That pollen gets pulled into return ducts, coats the coil, and creates a biological layer on top of everything. When homeowners ask why their allergies are unbearable in April even with the windows shut, the answer is often in the ductwork.
What we see in the field, particularly in older subdivisions like Spring Ridge and Henderson Village, is that duct systems built in the 1980s and 1990s have gaps and seams that were never sealed. Those gaps pull attic air – hot, dusty, sometimes moldy – into the conditioned space. Sanitizing addresses the biological growth. Duct sealing addresses the source. Together, they’re the difference between treating a symptom and fixing the problem.
How to Choose an Air Quality Contractor in Alpharetta
You have options. Here’s what separates a quote you can trust from one that will change on you.
First, ask whether the price is written before work starts. If a company won’t put a number on paper until the technician is standing in your living room, walk away. The Garrison Standard exists because the bait-and-switch model is common in this trade. Our technicians are background-checked and uniformed, and they show up with the price already worked out from the inspection.
Second, ask what equipment they run. A shop-vac and a drill brush are not commercial-grade air quality tools. The equipment roster matters because it determines whether the cleaning and sanitizing actually removes contaminants rather than stirring them up. We run Rotobrush rotary brush systems, Nikro negative-air machines, and filtration products from Honeywell, Aprilaire, Abatement Technologies, and Guardsman. If you’re comparing bids, ask the other company what machines they’re bringing and see if they can answer.
Third, ask what the warranty covers, in writing, and for how long. A vague “satisfaction guarantee” means nothing. Our answer is specific: 365 days, any failure of the work we did, we return at no charge. That’s the 365-Day Done Right Promise, and it’s in writing on every job.
Signs Your Alpharetta Home Needs Air Quality or Sanitizing Work
- Musty odor when the HVAC kicks on. That’s usually mold or mildew in the coil pan or duct lining. Sanitizing plus coil treatment addresses it, but the underlying humidity source may need attention too.
- Dust accumulating on vents within days of wiping them down. This usually means the ducts are dirty, leaky, or both. Negative-air cleaning and duct sealing are the standard fix.
- Allergy symptoms that spike indoors and ease outdoors. When the indoor air is the trigger, the contaminant is likely coming from the duct system or the coil. A sanitizing treatment can change that equation.
- Visible mold around supply registers. This is an active moisture problem. The sanitizing needs to happen, but the moisture source has to be identified and corrected or the mold will return. This is exactly the situation where the 365-Day Done Right Promise matters: if treatment fails within a year, we return.
- Previous homeowners smoked or kept pets indoors. Smoke residue and pet dander embed in duct surfaces and recirculate for years. Vapor fogging reaches surfaces a wipe-down never will.
FAQs – Air Quality & Sanitizing Cost
How much does air duct sanitizing cost in Alpharetta?
Expect to pay between $350 and $650 for a full duct system sanitizing on a standard single-family home in Alpharetta. That covers all supply and return ducts, the coil, blower, and plenums. Homes with two HVAC units or notable contamination run higher. Call (762) 769-7145 for a written quote.
Is air quality and sanitizing worth the money?
For most Alpharetta homeowners, the $350 to $650 cost of sanitizing is justified if you’re dealing with allergy symptoms, musty odors, or visible mold near supply registers. The alternative – replacing contaminated ductwork or running a UV system indefinitely – costs more. The value depends on what’s actually in your ducts, which a proper inspection will show.
How long does an air quality and sanitizing treatment last?
A professional sanitizing treatment in Alpharetta typically lasts 12 to 24 months, depending on humidity levels and filter maintenance. Homes with properly sealed ducts and regular filter changes get the longer end of that range. Every treatment from Hollis Air Duct Alpharetta is covered by the 365-Day Done Right Promise, so if it fails within a year, we return at no charge.
Can you sanitize air ducts without cleaning them first?
You can, but you shouldn’t. Sanitizing treats the surfaces, but if a layer of dust and debris is sitting on top of those surfaces, the antimicrobial product can’t reach them. A proper negative-air cleaning followed by sanitizing costs $495 to $895 bundled and is the standard approach. Treatments applied without cleaning don’t last.
What’s the difference between air duct cleaning and air quality sanitizing?
Cleaning removes physical debris – dust, dander, construction residue – using negative-air machines and rotary brushes. Sanitizing applies an antimicrobial treatment to kill mold spores, bacteria, and odor sources that cleaning alone doesn’t address. We price them separately in the table above, but most Alpharetta customers see better results when both are done together, which runs $495 to $895 for a typical home.
Do you offer free estimates for air quality work in Alpharetta?
Yes. Hollis Air Duct Alpharetta provides free estimates, and the price is written down before any work starts. Call (762) 769-7145 to schedule an inspection. Phones are answered by a live person, 24 hours a day, 7 days a week.
Get a Written Quote for Air Quality & Sanitizing in Alpharetta
If the air in your Alpharetta home smells stale, triggers allergies, or hasn’t been treated in years, the next step is simple. Call (762) 769-7145 and we’ll schedule an inspection, give you a written price in plain language, and answer every equipment question you have. As part of the Garrison Partners family, our standard is not the cheapest bid in Alpharetta. It’s the one you can hold us to for a full year, in writing.
Pricing reflects the Alpharetta market as of 2026. Hollis Air Duct Alpharetta offers free estimates – call (762) 769-7145.
Written by Roy Castellanos, Owner at Hollis Air Duct Alpharetta, serving Alpharetta and North Fulton since 2004.
What Our Customers Say
"Careful with the carpet and furniture. Even wiped down the vent covers before putting them back."
- Leo B."Duct sealing along with the cleaning cut our summer bill. Straight talk and fair price."
- Gwen O."Good job on the ducts. Ran about an hour over the estimate, though they told me early. Air smells cleaner."
- Mike E.