Illinois Blower Door Test Results
Chicagoland Service Area

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Passing a Blower Door Test - Made Easy

We find many of our new customers often worry about passing the blower door test for the Illinois Energy Conservation Code.  To ease the minds of our current and future customers we decided to put together this tips page along with real world results we have seen over the last 8 years since the State of Illinois started requiring air tighntess testing as part of the state wide energy code.

First, let's qualify what "passing" means in Illinois.  The Illinois Energy Conservation code is based off of the IECC 2015 National Energy Code.  However, Illinois adopted the code with a few amendments - one of which is related to blower door testing.  The national code says homes in climate zone 5 (think north of Interstate 80 to the boarder) should be able to meet 3 air changes per hour or 3ACH while the home is depressurized to a pressure of 50 Pascals, or 3ACH50.  Illinois decided this standard was to stringent for a number of reasons and loosened the standard to 5ACH50.  Meaning our homes can leak 167% of the required national standard and still pass.

What this means is, in the last 8+ years of doing testing, we've only seen a handful of homes fail this test.  Its not to say we don't see homes fail, we just don't see many of them. 

Interesting enough, the state of Illinois has also educated our building code officials to inspect our homes at rough (before drywall), and provide guidance on how to seal up the homes to ensure they will pass energy code.  This inspection is based on the IECC Energy Code checklists which have been in place since 2009.  Here is a presentation very similiar to what are code officials have seen  - Achieving Tight Envelopes.

Guess what, if you follow these guidlines your homes will come in around 3ACH50 or below and you will find your homes to have far fewer problems; interesting enough, the homes we see come in between 4ACH50 and 5ACH50 are the ones having problems such as:

  • Hard wood floor movement (buckling, seperating, etc...)
  • Moisture at and around windows
  • Drywall frosting in the winter
  • Attic Mold Issues

We have found many of our customers prefer a more hands on approach to help avoid some of these issues.  For $300, we will come out and walk through one of your homes before drywall to show you how to far exceed the blower door tests.  Howfar exceed you ask, well here's a summary of blower door test results we've seen in Ilinois; stay tuned, we will be adding links for each city so you can see how some of our customers have faired since they started working with us.

Average Blower Door Test Results by City

  • Thank you again and you will be the first person I call if I need additional part or service from your company.
  • I just wanted to send this message to all you and say GREAT JOB!  We had a rough inspection today and passed for the Woodward Ave. house. The inspector told us "if every house I inspected looked like this one I would be out a job".

    Anonymous Builder
  • We were so impressed with the amount of information the Priority Energy technicians gave us during our ENERGY AUDIT.  If you are buying a house, I would strongly recommend having them do an energy audit on it, in addition to your usual home inspection.

  • Thanks for a super intelligent and deep seminar expertly handled by a staff which was a pleasure to be around. Lunch was superbly and subtly handled.

    A.S. Architect
  • I wanted to thank you for all of your extra time and energy during our BPI training over the last few weeks. You really helped put things in perspective. You are an awesome crew and your facility is a valuable resource for students and the community

    BPI Student, L.E.
  • There is much less dust in the house and the monthly gas and electric charges have been reduced by 10 to 15%.....I'm sure I will see greater savings over a twelve month period......thanks again.

    Aeroseal Client, R.N.
  • Just completed my BPI Field exam for my Quality Control Inspector (QCI) certification renewal at Priority Energy.
    Such a convenient and well-set-up training and test center with caring and knowledgeable staff and proctors! Thanks folks!


    P.R., Ottawa, IL
  • It's been cold here for the past few days and I really feel the difference in heating since the building was Aerosealed! My apartment is so much warmer now. Thank you Priority Energy!


    Miruna; Tenant at Country Manor Apartments, Peru, IL
  • Anytime I can be a reference for all the great work on my (new) house, please let me know.  Priority Energy is outstanding at what they do!

    Executive at Medline Industries, IL

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