If your Chicago home feels drafty, uneven, or expensive to heat and cool, the issue may not be visible at all. Many comfort and energy problems are caused by hidden air leaks inside the home’s structure.
Blower door testing is one of the most effective tools for identifying where and how air is moving through your home. The test measures the amount of air moving through leaks in terms of cubic feet per minute (CFM), helping quantify the extent of energy loss. Perma-Seal provides professional blower door testing in Chicago to help homeowners understand energy loss, improve comfort, and make smarter insulation and air sealing decisions.
A blower door test is a diagnostic procedure used to measure a home’s airtightness.
During the test, a powerful fan is temporarily installed in an exterior doorway. This fan pulls air out of the home, creating a pressure difference that forces outside air to enter through gaps and cracks. Once pressurized, air leaks that are normally invisible become easy to locate.
This process allows technicians to:
Blower door tests also calculate air changes per hour (ACH), which indicates how often the inside air is replaced by outside air under test conditions.
Assessing your home’s performance requires specialized testing equipment and software to pinpoint where heat loss and air leaks occur. The blower door is a key diagnostic tool that creates pressure differences to reveal hidden air leaks and measure the airtightness of your building envelope. Thermal imaging cameras are also used to visually detect areas of heat loss and potential moisture problems, providing a clear picture of where insulation may be lacking. Advanced software programs can model your home’s performance, factoring in your specific climate zone, insulation levels, and building orientation. By combining these tools, insulation contractors and energy auditors can accurately identify problem areas and recommend targeted improvements to enhance your home’s insulation and overall energy efficiency.
Chicago’s climate creates constant pressure on a home’s building envelope. In winter, warm air escapes upward. In summer, hot and humid air pushes inward. Without proper sealing, this air movement leads to higher energy costs and comfort issues.
Blower door testing helps homeowners:
Many factors contribute to energy loss in a home, including insulation quality, window performance, and ventilation. Other factors, such as building orientation and materials, also affect overall energy efficiency.
Instead of guessing where problems exist, blower door testing provides clear, measurable insight.
Blower door testing often uncovers air leakage in areas homeowners don’t expect. These leaks commonly occur where different building materials meet or where penetrations pass through walls, floors, or ceilings.
Typical problem areas include:
Blower door testing can also evaluate the continuity and effectiveness of the home’s air barrier, which is essential for preventing unwanted air movement between indoors and outdoors.
These hidden leaks often explain cold floors, drafts, and uneven temperatures throughout the home.
Blower door testing is most valuable when it’s used to guide improvements, not just collect data.
Once air leaks are identified, solutions can be targeted where they matter most:
Attic air sealing can be completed before insulation is installed
Rim joist insulation can seal basement and crawl space leakage
Insulation upgrades can focus on the highest-impact areas
Working with an experienced insulation contractor ensures that air sealing and insulation upgrades are properly installed for maximum effectiveness.
This ensures insulation and air sealing work together to deliver real performance improvements.
Blower door testing is often used in conjunction with attic insulation and air sealing work.
It may be performed:
Adding more insulation to the attic can improve energy efficiency, but it’s important to remove old insulation if it’s damaged or ineffective. Insulating the roof deck can also help prevent heat loss and protect the attic from moisture issues.
This approach helps confirm that upgrades are working as intended and delivering measurable benefits.
Homeowners choose blower door testing because it replaces uncertainty with clarity. The results help guide decisions and improve outcomes.
Key benefits include:
Blower door testing results can also guide decisions about installing or upgrading mechanical ventilation systems to maintain healthy indoor air quality while improving energy efficiency.
Blower door testing is especially helpful for Chicago homes experiencing:
Some local building codes require blower door testing for new construction or major renovations to ensure compliance with energy efficiency standards.
Even newer homes can benefit, as air leakage is common at framing joints and penetrations.
Perma-Seal proudly provides blower door testing throughout Chicago and the surrounding suburbs, helping homeowners understand how their homes perform and how to improve them.
If your home feels uncomfortable or inefficient, blower door testing can help uncover the cause.
Schedule blower door testing in Chicago today
Connect with our insulation experts and explore how we can help you improve home comfort and save on energy bills. Contact us to schedule a free insulation inspection for your home today.
Nick L was courteous, communicative and very efficient in diagnosing my issues in my attic, very glad he came by. Permaseal is one of the best out there.