FAQs
Safety
The sealant is non-toxic and has been safely used in hospitals, surgery centers, schools, and government facilities all over the world. Additionally, the sealant has been tested by an independent lab and found to have extremely low concentrations of volatile organic compounds (VOC’s). The primary component has no OSHA maximum exposure limit.
Click Safety Data Sheet to see the information.
DuctSeal LT is a water-based stable acrylic emulsion and is tested as “Ultra Low VOC.”
Cost
The cost of a duct seal is typically less than 50% of replacing ducts.
In the Bay Area, most homes and businesses get their electricity from PG&E. PG&E's electricity rates are significantly higher than the national average, with California's rates being among the highest in the country, and PG&E customers often paying more than the California average. For example, a 2025 analysis showed the average California residential rate was over 90% higher than the national average. Every HVAC system is unique but our data shows that we typically get customers 15% to 40% reduction in system run time. If 40% of your utility bill is for heating & cooling your home, then your bill savings could be 6% to 16%.
We’re very proud of the results we achieve for our customers, and we encourage you to look at some of those recent results on our Facebook page: MaxSeals
Product Information
Up to a 5/8” hole can be sealed efficiently. The technician might perform manual repairs to plug larger accessible leaks and hasten the overall sealing process.
Our team will be moving throughout your house to prepare each room for the sealing process. We recommend that residents are not home during this time so the installers can seal the ducts quickly and efficiently, but if you’d like to be, then that is fine too.
General HVAC Questions
Ducts don’t always need to be cleaned for the Aeroseal process to be effective. Our team will evaluate the ductwork during the initial inspection and recommend cleaning if needed.
Yes. Ducts from all types of materials can be successfully cleaned after being sealed.
The patented Aeroseal process doesn’t coat or line ducts. Sealant particles will only be present in the location of a leak that was sealed.
Some items, such as humidifiers or UV lights, may be removed to prevent damage; others may be bagged or covered.
Yes. Even new ducts often have leaks at connections and seams. Sealing ensures your system operates at peak efficiency from the start.
Yes. Leaky ducts waste energy from your new HVAC unit. Sealing them maximizes efficiency, comfort, and savings.
Yes. Duct sealing is highly likely to improve your heat pumps ability to heat your home effectively. This is because heat pumps heat air to a lower temperature than a gas furnace does, instead, they rely on higher airflow volume to get the same heating performance.
- Your heat pump / furnace is too small, installing a bigger one is the only solution
- Your low airflow on this floor is because the system is poorly designed - you need a new duct system
- Your low airflow on this floor is because the system is poorly designed - you need a multi-zone system / booster fans / dampers
- Your low airflow in this room is because it’s fed by a leaky duct but the duct can’t be fixed because it is in the floor / wall / ceiling
- Your duct system is undersized - you need a new duct system
>90% of the time, we can solve all these issues just by diligently and comprehensively repairing and sealing your ducts. Why spend tens of thousands on new ducts or new equipment, when it’s likely that repairing and sealing your ducts is the right solution for your home and your budget.