How to Choose an Aeroseal Contractor: 9 Checks

Key Takeaways

Common Question	Short Answer
How do I find a certified Aeroseal contractor near me?	Use Aeroseal’s dealer locator on aeroseal.com, then check the contractor’s state license. Ask for a test-first quote and a written leakage target. Aeroseal near me
How much does Aeroseal cost?	At MaxSeal, Aeroseal costs $3,000–$3,500 per HVAC system, with discounts for homes with more than one system. National guides range from about $800 to $3,800, but scopes vary. See our price list
How long does Aeroseal take?	Most single-system homes are done in one day, including testing, preparation, sealing and final testing. What to expect on seal day
Is Aeroseal safe?	Aeroseal describes its residential sealant as non-toxic and ultra-low VOC, and it has been used in hospitals and schools. Ask your contractor for the safety data sheet. FAQs
What leakage target should a contractor commit to?	A written number, for example under 50 CFM25. In MaxSeal’s data from 38 systems, the median ending leakage was 50 CFM25. See the results study
Can Aeroseal fix every duct problem?	No. Aeroseal seals holes up to about 5/8 inch, so a good contractor hand-repairs large gaps first. How we repair ducts
What warranty should I expect?	Aeroseal lists a 10-year residential warranty that dealers can pass on. Be wary of a vague or verbal-only warranty.

1. The 9-point checklist

#	What to check	Why it matters	Red flag
1	Authorized Aeroseal dealer	Only dealers use genuine equipment, sealant and software	“Aeroseal-style” or “similar to Aeroseal”
2	State contractor license	Required for HVAC work in California, and confirms insurance and accountability	No license number on the website or quote
3	Publishes prices and tests before the final quote	You know the range up front, and the final quote and expected results come from measured leakage	No prices given, or a firm commitment with no test
4	Measures airflow at every register	Shows which rooms are starved and proves improvement	Only measures total leakage
5	Written leakage target	Sets a clear standard for “done”	“We’ll seal it up” with no number
6	Before and after report	Your proof of results, and useful when you sell the home	Report not offered or costs extra
7	Hand-repairs large gaps first	Aeroseal seals holes up to about 5/8 inch	Claims Aeroseal fixes everything
8	Clear warranty	Aeroseal lists a 10-year residential warranty that dealers can pass on	Vague or verbal-only warranty
9	Real local results	Case studies, numbers and verified reviews	Only stock photos and testimonials without data

2. Questions to ask on the phone

Are you an authorized Aeroseal dealer, and what’s your license number?
Do you test leakage and room airflow before giving me a price?
What leakage number will you aim for, and is it in writing?
Will I get the before and after report?
What happens if you find disconnected or crushed ducts?
What warranty do I get, and who backs it?
Can you show results from homes like mine?

3. What a good result looks like

From MaxSeal’s data on 38 Bay Area systems:

Benchmark	MaxSeal result
Average leakage reduction	86%
Median ending leakage	50 CFM25
Average airflow gain at registers	+47%
Systems that improved	38 of 38

See the full study and job-level data.

4. Serving the South Bay and Silicon Valley

MaxSeal LLC (CA License #1128398) is an Aeroseal dealer serving San Jose, Campbell, Los Gatos, Saratoga, Santa Clara, Gilroy and the wider Bay Area. See our Aeroseal service page or San Jose page or call (408) 400-3630.

Conclusion

A good Aeroseal contractor is licensed, authorized by Aeroseal and tests before quoting. They measure airflow at every register, put a leakage target in writing and give you a before and after report.

Use the checklist and the phone questions to compare contractors on the same terms. The contractor who shows you numbers is the one you can hold to a result.

Get a Free Consultation or call (408) 400-3630.