If you hire this pro, you’re covered by a money-back guarantee. Learn more
If you hire this pro, you’re covered by a money-back guarantee. Learn more
About
More air, system-wide. Without a new furnace, AC or ductwork.
MaxSeal is the Bay Area's duct sealing specialist. We get more airflow out of the HVAC system you already own by sealing your ducts from the inside with Aeroseal's patented, non-invasive technology, usually in less than a day. If ducts are disconnected, crushed or torn, we repair them first.
Signs you have leaky ducts: hot or cold rooms, dust and poor air quality, a house that takes ages to heat or cool, high energy bills, drafts, or a new furnace or AC that isn't performing.
Measured, not promised: we test duct leakage and the airflow at every register before and after, the same visit, and you get a Certificate of Completion showing your results room by room. Across 88 MaxSeal jobs, the median home gained 31% more air.
Certified Aeroseal dealer and C-20 licensed California contractor. 10-year warranty on every seal, plus a guaranteed HERS duct leakage pass. No upsells, just clear pricing and measurable results.
Comfort you can feel. Results you can measure.
Overview
Hired 3 times
Serves Campbell, CA
Background checked
4 employees
2 years in business
Business hours
This pro hasn't listed their business hours.
Payment methods
This pro accepts payments via Apple Pay, Cash, Check, Credit card, Stripe, and Zelle.
Services offered
Duct and vent type
Heating
Building height
Single-level
Two-story
Three-story
High-rise
Property type
House
Condo/Apartment
Townhouse
Business
Projects and media
Projects and media
Reviews
Customers rated this pro highly for professionalism, punctuality, and responsiveness.
Exceptional 5.0
35 reviews
5
100%
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Your trust means everything to us. Learn about our review guidelines.
Read reviews that mention:
Ketki G.
Jul 6, 2026
•
Hired on Thumbtack
Alex and Daniel helped us with examining our home's duct as we suspected a leak due to insufficient cooling. They ran the leak test and informed us of all the air flow through each vent and gave informative tips to optimize the air flow with the seal. They went above and beyond by also inspecting our crawl space and putting back some broken vents in place even when this wasn't their issue to fix. Overall I highly highly recommend their service for duct and air optimization.
Details: Not enough airflow / Blocked vents • Different temperatures across property • Heating and cooling • Rigid sheet metal • Single-level building • House • Owner
Duct and Vent Repair
Ronald M.
Jun 16, 2026
•
From Google
MaxSeal provided a very high quality of service at a very reasonable price for my Santa Cruz home. They came in lower than a competing bid but provided excellent knowledgeable and friendly service. Their communications with me were clear, they arrived and left on time, and their workmanship was exemplary. They analyzed and then fixed our vents and attic ducts efficiently, measuring airflow and heating efficiency before and after the work to clearly quantify the results achieved. When an unexpected problem with a duct was discovered, they came back with additional tools to investigate and solve it.I would recommend MaxSeal highly to anyone needing duct and vent services for their home.
MaxSeal LLC's reply
Ronald, thank you for the detailed review.
We’re really glad you had a smooth experience with our team and that the results were clear and measurable. Taking the time to compare bids and still choosing us means a lot, and we’re happy we could deliver strong value along with quality workmanship.
It’s also great to hear that the testing process and before-and-after analysis helped give you confidence in the improvements made. When unexpected duct issues come up, we always aim to address them properly rather than just moving forward quickly.
We truly appreciate your recommendation and support.
Chris F.
Jun 29, 2026
•
From Google
Our PG&E always showed that our usage was much higher that other homes in our area. We have tried blocking vents, got a new ac unit, etc... nothing helped. I saw Maxseal on Instagram and it sounded like something worth trying. Alex and his team are amazing from the start. No strong arm tactics, just diagnostics that I could see and a great explanation of how the system works. I have to tell you, that I could IMMEDIATELY feel the difference . My vents are blowing so hard now that your hair is blowing in the wind! I'm so thrilled.
MaxSeal LLC's reply
Chris, thank you for sharing your experience.
We’re really glad you noticed an immediate difference in airflow, that’s exactly what we aim for when the system is properly balanced and sealed. It’s also great to hear that the process felt transparent and pressure-free, we always want homeowners to understand exactly what’s happening and why.
We appreciate your trust in giving us a try, and we’re thrilled the results exceeded expectations.
timothy D.
Jun 5, 2026
•
From Google
Alex from Max seal completed the sealing process for our house. The outcome was beyond expectation, reducing Air leakage by 80%, getting total leakage down to 2.3%. I put off making a review until I could get further confirmation from PG&E where latest two bill indicated I am using ~20% less energy the compared to year before (Gas + Electricity). The other remarkable metric is the quality of air in the house is greatly improved, we run a weekly robo vacuum (Skippy) and usually the bin is always filled, now the bin is always practically empty, no more stuffy noses, amazing. The whole process took about 6 hours. During the application, they have a PC running with a live plotting chart of Air flow loss in ventilation system, and you could see how in the application process the air flow losses gradually decayed until the process maxed out, real time verification of how the process actually works. Highly recommend Alex and his team, they did an outstanding job, in communication, effectiveness, and in professionalism, taking care not to make a mess anywhere. Overall, ~ $3K for 1800sq ft house, estimating ROI ~ 3 yrs, with the added benefit of a greatly improved quality of Life...
MaxSeal LLC's reply
Timothy, thank you for such a detailed and thoughtful review.
We really appreciate you taking the time to validate the results with real energy data over time, that kind of confirmation means a lot. It’s great to hear that the reduction in leakage translated into noticeable improvements in both efficiency and indoor air quality.
We also love that you highlighted the transparency of the process and real-time testing. Being able to actually see how the system performs during the application is something we take a lot of pride in.
Thank you again for your trust and for recommending us.
Hugo P.
May 7, 2026
•
From Google
Amazing results from the process performed by MaxSeal! I was a bit skeptical as the product used sounded almost too "magical" but it really works. After a couple of hours of injection, all of the invisible holes in our HVAC ducts were sealed. How can we know? The air flow increased A LOT! It increased so much that we can hear the difference ! It actually revealed a small issue we had... our registers suck. With stronger air flow, some make rattling noise or couldn't stay properly closed, a sign of success from the process, even if it is a bit annoying that I had to change some ;)Finally, as a nice bonus, Alex the owner and Max who came to do the assessment and actual sealing process were super nice guys!
MaxSeal LLC's reply
Hugo, thank you for such an honest and detailed review.
We completely understand the initial skepticism, it’s not every day you see something like this process in action. That’s why we rely so much on real testing and measurable results so homeowners can clearly see what’s actually happening inside the system.
It’s great to hear you noticed the airflow improvement so strongly, even down to hearing the difference in the registers. And yes, sometimes improved airflow can reveal existing weak points in older registers, it’s actually a good sign the system is finally moving air the way it should.
We also really appreciate your kind words about Alex and Max. It means a lot to the team.
Credentials
Background Check
Alex Blakey
FAQs
What should the customer know about your pricing (e.g., discounts, fees)?
Every job starts with a duct leakage test and room-by-room airflow measurements, so we know exactly what's wrong before we price anything. You then get a written fixed-price quote (our Statement of Work). No hourly billing and no upsells: the price we quote is the price you pay. Many homes come in around $3,000, depending on the size of the system and any duct repairs needed.
What is your typical process for working with a new customer?
1) We talk through what's bothering you: hot or cold rooms, dust, high bills, a failed HERS test. 2) We measure total duct leakage and the airflow at every register. 3) We repair any disconnected, crushed or torn ducts. 4) We tape the register boots and, if needed, clean the ducts. 5) We seal the ducts from the inside with Aeroseal. 6) We re-measure everything the same visit and give you a Certificate of Completion showing your results room by room.
What education and/or training do you have that relates to your work?
MaxSeal is a certified Aeroseal dealer, trained by Aeroseal on its patented duct sealing process, and a C-20 licensed California HVAC contractor (license #1128398). We test duct leakage with HERS-equivalent methods and equipment, and measure airflow at every register with calibrated instruments.
