Find a Diagnostic Energy Tester

Thank you for visiting the Illinois Code Diagnostics website. Please understand that there is currently a funding gap and a period of program inactivity. This website will not be updated until program funding returns. 

On January 1st, 2016, the State of Illinois updated the Illinois Energy Conservation Code (based on the 2015 International Energy Conservation Code with Illinois amendments) through the Illinois Energy Efficient Building Act [20 ILCS 3125]. As part of the new energy code, blower door testing is required to demonstrate a building infiltration rate of no more than 5 ACH50. Duct tightness testing is required where the air-handler or any portion of the ducts are located outside of the building thermal envelope or pressure boundary. For more information on diagnostic energy testing as it applies to the Illinois Energy Conservation Code, please visit DCEO's Frequently Asked Questions page.

The Illinois Department of Commerce and Economic Opportunity (DCEO) and the Midwest Energy Efficiency Alliance (MEEA) are providing a list of individuals who have taken training or hold certifications related to using building diagnostic equipment including, but not limited to, blower door and duct pressurization equipment. These individuals have received training or certifications demonstrating that they are able to complete blower door testing and/or duct leakage testing in compliance with the Illinois Energy Conservation Code. The State of Illinois does not endorse individual building diagnostic testers. It is recommended that anyone interested in utilizing this list solicit multiple bids and check relevant insurance and licensing of the professionals being considered for building diagnostic tests. For more information on the types of training and certifications listed, please visit the More Information page.

Statewide Diagnostic Tester Coverage
Map of Statewide Diagnostic Tester Coverage

Blower Door Testers

Is less than miles

Duct Leakage Testers

Is less than miles

Company or Individual Name

For a list of contractors that have been recognized as qualified to perform diagnostic energy audits and/or comprehensive home energy upgrades through the statewide Illinois Home Performance with ENERGY STAR program go to the Illinois Home Performance website.