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Air Sealing & Insulation
Spray foam installation

While we offer a complete ranges of insulation services, air sealing is a vital part of any insulation job to maximize the benefit of your insulation. 


Air will leak out of or into a building envelope that is not well sealed. This leakage of air decreases the comfort of a residence by allowing moisture, cold drafts, and unwanted noise  and may lower indoor air quality by allowing in dust and airborne pollutants. In addition, air leakage accounts for between 25 percent and 40 percent of the energy used for heating and cooling in a typical building .


The amount of air leakage in a house depends on two factors. The number and size of air leakage paths through the building envelope. These paths include joints between building materials, gaps around doors and windows, and penetration for piping, wiring and ducts. The second is the difference in air pressure between the inside and outside. Pressure differences are caused by wind, indoor and outdoor temperature differences (stack effect), chimney and flue exhaust fans, equipment with exhaust fans (dryers, central vacuums) and ventilation fans (bath, kitchen).


Air sealing the building envelope is one of the most critical features of a comfortable, healthy and energy efficient building.   A “blower door” test  is a great way to identify air leakage paths so that they can be sealed.

Code Compliance Testing
New construction ready for lower door and duct leakage testing

Air Seal Tech offers code compliance blower door & duct leakage testing to certify that new homes meet the mandated maximum air changes  per hour (ACH50) or duct leakage rates.

This is available as pre-construction consulting, verification prior to installation of drywall during construction  or as a simple building completion verification with a code compliance certificate. 


Homes that exceed maximums can be inspected with an infrared camera to help pinpoint trouble spots that can often be corrected on the same visit  to achieve a passing test result.

Blower Door & Duct  Leakage Testing
We use state of the art Retrotec and Flir diagnostic and test equipment

Air Seal Tech is your best value in blower door & duct leakage testing in the Mpls./St Paul  7 county metro area. We provide prompt, affordable state of the art professional service to builders, contractors and homeowners.  While we often come in at up to half the cost of our competitors we offer a level of service and quality that is second to none.  Whether you need code compliance  certificates,  trouble shooting, or utility rebate testing we are your best choice.

Blower door testing is an invaluable tool to test for air leakage measurements, pinpointing areas that require attention, and testing and verification of the improvements achieved through air sealing retrofits.  When combined with thermal imaging equipment it allows us to find the smallest of air leakage areas as well as areas that have condensation and moisture issues that may not be visible to the naked eye. 

At Air Seal Tech we use state of the art Retrotec Blower door equipment and duct testers.  For thermal imaging  we use Flir infrared cameras  which allow to find and document  air leakage, insulation defects and moisture issues. 

Flir thermal image for energy audit

Thermal imaging cameras are well-established as valuable inspection tools that help reveal missing insulation, air flow and ventilation issues, compromised areas of the building envelope, condesation issues and much more. By detecting and locating patterns and sources of heat loss that are invisible to the naked eye, thermal images provide convincing evidence of where improvements need to be made and of how well they’ve been completed.

Instead of a time consuming search for air leaks with a smoke bottle or puffer, thermal imaging allows us to scan and pinpoint air leaks in a wall or entire room in a matter of minutes saving both time and resources

Thermal imaging is a powerful tool but requires knowledgable interpretation and an understanding of building physics and  construction for the thermal images to yield accurate information.

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