Frequently Asked Questions

We connect a negative-air machine to your ductwork, which puts the entire system under vacuum. Then we run agitation tools through every supply and return register to loosen debris that has bonded to the duct walls, and the vacuum pulls it into a HEPA-filtered collection unit rather than blowing it into your living space. The blower compartment and evaporator coil get cleaned by hand. The process takes two to four hours in a typical Alpharetta home. When we finish, we close every access point, reset the registers, and leave the mechanical room the way we found it.

A standard single-system home in Alpharetta takes two to four hours from the moment we ring the bell to the moment we walk the cleanup checklist with you. Larger homes in neighborhoods like The Manor or Country Club of the South with dual systems and long trunk runs can take five to six hours. We give you a window when you book and show up inside it. That is a Garrison Code rule, not a courtesy. Plan for a half day out of your normal routine, and know the house remains livable the entire time.

In most Alpharetta homes, no. We gain access through the existing register openings and the plenum at the air handler. There are cases where trunk-line design prevents proper tool reach, and in those situations we cut a small access point, clean through it, then seal it with a proper patch and mastic. We'll tell you before we make any cut and show you the sealed result before we leave. The goal is a complete cleaning with zero measurable air loss afterward.

It shouldn't be, and with our process it isn't. The negative-air machine keeps the system under continuous vacuum while we agitate, so dust moves toward the collection unit instead of your floors. We drop protective floor covering at every register we work through, wear shoe covers inside your home, and run a HEPA-filtered capture point at each opening. After the job, we walk a cleanup checklist before we leave. The Garrison Code requires leaving the site clean and squared away. If something isn't right, we fix it before we go.

It often does, and it's one of the most common reasons people call us. Alpharetta's spring pollen season is fierce, and Georgia humidity keeps duct interiors damp enough for dust to cling and accumulate. When your blower cycles on, it pushes whatever has settled in the ducts back through the living space. Cleaning removes that reservoir. We can't promise a clinical outcome, since allergens also enter through open windows and on clothing, but a majority of our customers report visibly less dust settling on furniture within the first month after cleaning. Pairing the service with a quality filter upgrade helps more.

Every three to five years for most Alpharetta homes. Homes with shedding pets, recent renovation work, or occupants with severe allergies and asthma sit closer to every two to three years. If you bought a home and have no record of the ducts ever being cleaned, do it once and then start your own clock. The NADCA recommendation, which we follow, is to clean when visible mold, vermin activity, or heavy debris is present, and to inspect annually. A quick look behind a supply register with a flashlight will usually tell you which side of the timeline you're on.

Yes. A significant share of Alpharetta homes run a mix of flex duct in the attic and trunk lines through a crawlspace, and both are cleanable. Attic runs in Georgia get brutally hot in summer, which accelerates the breakdown of dust and dander into fine particulate. Crawlspace ducts deal with humidity and occasional rodent intrusion. We access whichever space your system lives in, and we're careful with your insulation and vapor barrier while we work. If you've had a rodent issue, let us know when you book so we plan the appropriate containment.

We service duct systems connected to all major filtration equipment, including Honeywell electronic air cleaners, Aprilaire media filters, and Guardsman UV systems. The cleaning process itself is brand-agnostic since we're addressing the ductwork, not the filter cabinet, but we pay close attention to how each brand's housing integrates with the plenum so we don't knock a sensor or alignment out of spec. If you have an Aprilaire media cabinet, we'll ask you to have a replacement filter on hand so you're not running a dirty media after we've cleaned the system.

Our focus is the ductwork itself, but we can supply and install standard media filters, electronic air cleaner cells, and Guardsman UV bulbs during a cleaning visit since we already have the system opened. Roy Castellanos keeps common sizes on the truck in Alpharetta. If your setup needs a less common filter dimension, we'll give you the exact measurement to order and can return to install it. We don't push add-ons. If your existing filter is doing its job, we'll tell you to keep it and save your money.

This is a frequent call from Fair Oaks and new construction pockets around Alpharetta. Drywall dust, sawdust, trim offcuts, and construction debris routinely end up in freshly installed ductwork before the registers are covered. That dust then cycles through your system for the first year you live there. A post-construction cleaning removes it before it coats the blower motor and evaporator coil. The Environmental Protection Agency recommends having newly built homes' ducts inspected and cleaned when debris is visible. Cost is the same as a standard cleaning, though heavy drywall dust can add time. We'll price it in writing on the walkthrough.

Hollis Air Duct Cleaning Alpharetta operates as an independent local business under the Garrison Partners family, and we carry the coverage required to work in Georgia homes. Every pro working under our name is required to hold the license and insurance their state requires. We're happy to provide proof of coverage before we start work if your HOA or property manager needs documentation. If you're in a managed community in Johns Creek, Milton, or Alpharetta proper, let us know when you book and we'll bring the paperwork.

Every pro working under the Hollis Air Duct Cleaning name is required to pass the screening standards set by Garrison Partners before they enter a home. We're letting strangers into your house, often through the attic access and into every room. We treat that trust seriously. Roy Castellanos leads the Alpharetta team and knows every crew member who works this territory. If you ever want to know who's coming to your door before they arrive, call (762) 769-7145 and we'll tell you.

No, but you'll need to provide access. Many Alpharetta homeowners give us a garage code or leave a lockbox and head to work, and that's fine. We'll call or text when we arrive and again when we finish, and we'll send before-and-after photos of your ducts so you can see the work was done even if you weren't standing there. The written price is agreed before you leave, so there's no ambiguity about the bill. If you're in Dunwoody or Duluth and commuting, you don't have to burn a vacation day for clean ducts.

Sometimes, depending on the schedule. We do our best to accommodate urgent situations, like a pre-move-in cleaning with tenants arriving, or an inspection deadline from a home sale. Call (762) 769-7145 early in the day and our coordinator will check the board for an open window. We book in scheduled windows rather than promising a same-day arrival we can't guarantee, because showing up inside the window we gave is a Garrison Code rule. If we can't get to you today, we'll offer the earliest window that works for you.

We're open Monday through Friday from 7:00 AM to 7:00 PM, and Sunday from 7:00 AM to 7:00 PM. We're closed Saturday. Those hours are set so we can reach working homeowners before and after their commute. If you call outside those hours, leave a message and our coordinator will return it the next business morning. We're not a 24-hour operation, and we won't pretend to be one. What we will do is give you a real window when you book, and show up inside it.

Musty odor in an Alpharetta summer usually means microbial growth inside the ductwork or on the evaporator coil, and it should be addressed promptly, especially for anyone in the house with asthma or immune concerns. Georgia's humidity creates conditions where mold can take hold when condensation doesn't drain properly. A professional cleaning with proper antimicrobial treatment, paired with a check of your drain pan and coil, is the right first step. If you can see visible mold growth on the register or coil, don't run the system until it's evaluated. Our team covers Alpharetta and surrounding areas including Roswell and Cumming.

Every Hollis Air Duct Cleaning job is guaranteed in writing for a full year under The Garrison Standard. The guarantee covers the work we performed: if dust, debris, or contamination that we were paid to remove reappears in the ducts inside 12 months, we come back and re-clean at no charge. It does not cover new construction dust, pet dander that accumulates after the cleaning, or damage from a leaking roof or ductwork that was already compromised. The guarantee is delivered in writing with your invoice, not buried in fine print on a website.

The Garrison Standard is the service code that every Hollis Air Duct Cleaning location, including Alpharetta, operates under. It has five rules: show up inside the window we gave you, put the price in writing before any work starts, do the job by the book the first time, leave the site clean and squared away, and stand behind the work for a full year. It's a discipline standard, not a marketing slogan. If any of those five things doesn't happen on your job, we want to know before we leave your driveway, not after you read a review.

Not really, and we say that as people who see DIY attempts every month. You can vacuum a register opening with a shop vac, but the main trunk line, return plenum, and blower compartment require professional negative-air equipment and long-reach agitation tools to reach. Household vacuums don't have the static pressure or filtration to capture what they disturb, so a DIY attempt often loosens debris that then blows into your living space on the next cycle. Attic and crawlspace access in Alpharetta homes adds a safety concern with heat and tight spaces. We recommend leaving it to trained pros with the right equipment rather than risking a partial job or a fall from an attic ladder.

We don't lock Alpharetta homeowners into a contract or a subscription. We'll give you a recommended cleaning interval based on what we find in your system, and we'll put a reminder card in your file so you hear from us at the right time. If you prefer to set it and forget it, we'll call or email you when your window is approaching. You're never obligated to book. The goal is a clean system and a homeowner who knows when it's time for the next one, not a recurring charge on a credit card statement.

Yes, and we do this all the time for homebuyers across Alpharetta, Johns Creek, Milton, and Roswell. The window between closing and moving in is the cleanest time to do the work: no furniture to move, no one home to work around, and you start fresh. We coordinate with your real estate agent or closing attorney on timing, and we can provide the vendor invoice your lender or agent may want for the file. If the previous owner had pets or smoked indoors, we recommend adding an antimicrobial treatment to the scope. Call (762) 769-7145 to schedule around your closing date.

We work the full Alpharetta market and the surrounding communities: Cumming, Suwanee, Canton, Druid Hills, Fair Oaks, Roswell, Milton, Johns Creek, Dunwoody, Duluth, and Norcross. If you're near the border of any of those areas, call us and we'll confirm. Roy Castellanos knows these streets, and the local team has cleaned systems in everything from 1980s split-levels in Roswell to new builds in Cumming. Same flat price per system, same written quote before work starts, no matter which of these towns you call home.

Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning Alpharetta, serving Alpharetta and the surrounding communities since 2004.