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We are Central Illinois' home for all of your insulation needs.  We pride ourselves on our hard work, skilled workers, and the ability to be a locally-owned, family business.  Allow us the opportunity to provide an insulation solution for your home or business.

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Blower Door Testing in Decatur, Illinois


Imagine leaving a window in your home open for 24 hours a day. Think of all of the air that is escaping. Well, a similar amount of air may be leaking from your home if you haven’t had a blower door test. This test is quick and simple, but it can help you save money on your energy costs. A leak in your home could be the reason you’re still feeling cold air — even when the heat is running.

What is a Blower Door Test?


This test is a required step here in Illinois as part of our state’s Energy Conservation Code. It must be done to show a building infiltration rate of no more than 5 ACH50. An air duct tightness test is required if any portion of air ducts are located outside of the building thermal envelope or pressure boundary.


How does the test work?


A blower door test helps the Assured Insulation team locate any air leaks in your home. We attach a fan to a doorway to depressurize your house. Then, using an infrared camera, we identify the cause of the air leak in your home.

As newer homes are built, we are seeing more integrated system components. Examples include mechanical ventilation, sealed combustion appliances, and tight building techniques. It is now even more important to make sure these newer systems are working their best. Contact us today to test the efficiency and safety of your systems.


How long will the test take?


The Assured Insulation team is professional and experienced. For a standard airtightness test of a home, we’ll just need about 30 minutes. Here’s how it works:

  • We arrive at your home and determine if we need to do any preparation
  • We install the blower door in 5-10 minutes
  • In less than 5 minutes, we perform the test to determine the overall leakage
  • We perform additional diagnostic procedures to find and address the major leakage sites. The post-test process may take another 30-45 minutes. This also depends on the size or complexity of your house.

Find the leak fast.  Contact us to learn more about a Blower Door Test.


We won’t take much of your time. With this maintenance test, go into the next season knowing your house is properly sealed. Enjoy cooler summers, warmer winters, and lower energy bills.

Is your home wasting precious heated and cooled air?
Get in touch to schedule a blower door test to find out.  A member of our team will contact you shortly.