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Aeroseal
Sealing From the Inside Out
Hand-sealing ductwork with mastic works well on the joints a technician can see and touch. The trouble is that in a lot of Central Texas homes, a good share of the duct system is buried: runs between the first and second floor, ducts inside interior walls, a return chase framed into a closet, or the boots that disappear into the ceiling. Those leak just like the attic joints do, and nobody can get a brush on them.
Aeroseal takes a different approach. The registers are blocked off, the duct system is pressurized, and a fine mist of sealant is introduced into the airflow. Air escaping through a gap carries sealant particles with it, and they build up on the edges of the opening until it closes. It seals what the pressure test says is leaking, wherever it is, and the equipment shows the leakage dropping as the process runs, so you see the result rather than take our word for it.
We treat Aeroseal as one tool, not the only one. Our technician starts with an inspection, hand-seals what is reachable, replaces anything crushed or torn, and recommends Aeroseal when the remaining leakage is somewhere hands cannot go. That combined approach is priced in writing under the Home Comfort Guarantee, and larger duct projects can use financing.
- Reaches concealed ducts Between floors, inside walls, under a slab. If air is leaking out of it, the sealant finds it.
- Measured, start to finish Leakage is tested before, tracked during and reported after. You get the numbers on paper.
- You stay home The process runs from the equipment and the registers. No demolition, no drywall repair afterward.
When Aeroseal Fits
Homes Where Sealing From the Inside Makes Sense
Aeroseal is the right call when the leaks are somewhere a technician cannot get to.
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Two-story homes with ducts between floors
The runs feeding the first floor are often sandwiched in the floor system, completely inaccessible without opening ceilings.
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Framed return chases
A return built from studs and drywall leaks at every seam. It cannot be sealed from the attic, but it can be sealed from inside.
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Ducts under the slab or in the walls
Some older Austin and San Antonio homes have ducts you will never see again. This is the only practical way to seal them.
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Leakage still high after hand sealing
When the attic joints are done and the pressure test still shows loss, the rest is hidden. Aeroseal closes it.
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A new system going onto old ducts
A tight duct system lets new equipment perform the way it was sized to. Sealing before the install is the right order.
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You do not want the ceilings opened
The alternative for concealed leaks is cutting drywall to reach them. Most homeowners would rather not.
What the Job Covers
Aeroseal as Part of a Complete Duct Fix
Sealant fixes leaks. It does not fix a crushed run or a return that is too small, so we handle those too.
- Inspection and leakage test We trace the ducts, note damage and measure how much air the system is losing before anything is sealed.
- Hand sealing where possible Large openings and reachable joints get mastic first. Aeroseal is for what is left, not a substitute for basic work.
- Repairs before sealing Disconnected, kinked or chewed runs get fixed or replaced. Sealant cannot bridge a duct that has fallen off its boot.
- Protecting the equipment The coil, blower and any sensors are isolated so sealant goes only into the ducts.
- The sealing process Registers blocked, system pressurized, sealant introduced and monitored until the leakage reading levels off.
- Before-and-after report A printed summary of the leakage before and after, so the result is documented for you and for a future buyer.
How It Works
What an Aeroseal Visit Involves
Plan on most of a day. You can be home, and there is nothing to clean up afterward.
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Test and quote
We inspect the ducts, measure leakage and give you a written price that covers repairs, hand sealing and Aeroseal together.
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Fix and hand-seal first
Damaged runs are repaired and reachable joints get mastic, so the sealant is only asked to do what it does best.
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Seal from the inside
Registers are covered, the equipment is isolated, and the sealing runs while the technician watches the leakage fall.
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Verify and report
Everything goes back together, the system is run, and you get the before-and-after numbers in hand.
Current Specials
Save on the work your home needs most.
Leaks You Cannot Get To?
Ask about Aeroseal for your Austin or San Antonio home. Written price first, no surprise fees.
What Our Customers Say
Don't just take our word for it — hear from our satisfied customers
★★★★★
Our 18 year old HVAC system finally gave out this past week, so we reached out to Radiant to see what could be done. They sent a tech out named Bryan the same day, and he did a great job looking over the entire HVAC system. He was friendly and helpful in explaining everything that he saw, and our options moving forward. We decided to replace the entire system, so we met with Jacob (same day thankfully) to find the best HVAC system for our needs. Jacob was friendly, professional, and did a great job explaining the different options on offer. Radiant was able to set-up next day install, which was much appreciated, because the temps were still going to be cold in the coming days.
The install team consisted of Carlos and Pablo, who were very courteous and professional, and were kind enough to answer any questions I had regarding the install. They did a great job installing our new HVAC system, and were tidy which is always appreciated! Before they left, they explained everything that had been done, and showed me photos of the work.
Our entire experience from start to finish was great. I appreciate that they send photos of who is coming to your home too. Friendly, kind, professional team members, and good work all the way around. Thanks Radiant!
The install team consisted of Carlos and Pablo, who were very courteous and professional, and were kind enough to answer any questions I had regarding the install. They did a great job installing our new HVAC system, and were tidy which is always appreciated! Before they left, they explained everything that had been done, and showed me photos of the work.
Our entire experience from start to finish was great. I appreciate that they send photos of who is coming to your home too. Friendly, kind, professional team members, and good work all the way around. Thanks Radiant!
★★★★★
This is the first time I’ve used radiant my neighbor recommended them…. I called them today and they set me up an appointment on the same day. I was totally shocked at that and the service call was only $39!!…. Highly recommend them Danielle showed up and he was a great guy and he put up with all my wishy-washiness and I had to hurry him because I was heading to church and he got caught in a lot of traffic getting here he even would’ve installed the part that broke but I Didn’t have the time tonight….. He was patient with me and just told me to call the office first thing in the morning and get a service call set up…. Thank you so much Radiant!!….
With another cold front coming in tomorrow now I just hope they can get me scheduled for a separate call tomorrow but I have a feeling they will. They are such a great company!!😊😊
With another cold front coming in tomorrow now I just hope they can get me scheduled for a separate call tomorrow but I have a feeling they will. They are such a great company!!😊😊
★★★★★
Alex performed the winter service on my unit. This business along with Alex, are very professional and upfront about everything. To be transparent, this is the maintenance included with the purchase of a unit from them. I was informed about everything to include pictures as proof. I was told that my unit is 100% and very clean and again pictures to prove it. I was reccomended this business by a friend and glad he did. The initial purchase experience was also amazing. I had contacted 5 other businesses to get quotes about a new unit as my upstairs unit failed. 2 were outrageous quotes and I am technically still waiting on the other 3. On every instance of getting a quote, I waited about 1 week. Luckily my house has two units but still, un acceptable especially during the summer. I guess they all had so much business they did not care for mine. When I called this business not only did they come out the same day, I had the new unit installed with in 48 hrs. Oh and let's not forget the quote they gave me was the lowest of all. I can say enough good things about this business. Keep up the great work.
Maintenance Membership
Join the Care Club
Home maintenance for $9.99 a month.
Care Club members get two HVAC tune-ups and a plumbing safety inspection every year, priority scheduling, no dispatch fees — ever — and 5% off every repair.
- Priority scheduling
- Seasonal HVAC tune-ups
- Annual safety inspection
- Exclusive member discounts
- Free dispatch on repairs
- No long-term contracts
Aeroseal Questions
How does Aeroseal actually seal a leak it cannot see?
The registers are blocked and the duct system is pressurized, so the only way air can leave is through the leaks. A mist of sealant is then introduced into that moving air. Where air squeezes through a gap, the sealant particles are carried to the edges of the opening and stick there, building inward until the gap closes. It does not coat the inside of the ducts; it collects only where air is escaping. The equipment measures leakage throughout, so the technician can see the number dropping and knows when the system is as tight as it is going to get.
Is Aeroseal safe to have done while we are in the house?
Yes. Homeowners stay home for the process, and there is no demolition or dust. The sealant is applied inside the duct system with the registers blocked, and the technician isolates the coil, blower and controls before starting. Once the sealing is finished, the ducts are ventilated and the system is run normally before we leave. We are careful not to overstate what any product does, so if you have specific sensitivities, ask our technician during the estimate and we will walk you through the material data and the process in detail.
Do I still need hand sealing or duct repairs if I get Aeroseal?
Usually yes, and we will not sell you Aeroseal alone if the ducts need more than that. The sealant closes gaps and cracks. It cannot reconnect a flex duct that has pulled off its boot, straighten a crushed run or enlarge a return that is too small. So the visit starts with an inspection, reachable problems get fixed with mastic and proper fasteners, and Aeroseal handles the hidden leakage that is left. The written quote lists each piece separately so you can see what you are paying for.
Should the ducts be cleaned before Aeroseal?
Often, and we will tell you if yours should be. The sealant bonds to the edges of a leak, and heavy dust or debris in the duct can interfere with that. If the inspection shows significant buildup, duct cleaning comes first, and it makes sense anyway since a freshly sealed system will otherwise blow years of settled dust into the rooms with its improved airflow. If the ducts are reasonably clean, we go straight to sealing. Either way the sequence and the price are in writing before we begin.
*Offers cannot be combined with other promotions or applied to dispatch fees. No cash value. Must present offer at time of service. Call for details.
