Blower Door Testing
air tightness—a key factor in energy efficiency, indoor air quality, and code
compliance.
What Is Blower Door
Testing?
Blower door testing uses a calibrated fan mounted in an exterior doorway to pressurize or depressurize the home. As the fan pulls air through leaks in the building envelope, sensors measure the airflow required to maintain a set pressure (typically 50 Pascals).
This reveals how airtight the home is and helps pinpoint areas of leakage.
Why Choose C2S Energy?
Certified HERS Raters
Trained and RESNET-certified for accurate, code-compliant energy ratings.
Local Expertise
We know the regional codes, climate, and programs that affect your project.
Hands-On Support
From start to finish, we guide you through every step. No guesswork, no delays.
Blower Door Testing
Services for Building
Performance
At C2S Energy, we provide professional, certified Blower Door Testing services to ensure your residential or light commercial building meets modern energy standards and operates efficiently.
Required by today’s energy codes and green building programs, blower door testing is a crucial step in verifying the airtightness of the building envelope—and identifying opportunities for improved energy performance, comfort, and indoor air quality.
Our process is comprehensive, efficient, and tailored to meet both code and practical performance goals. Whether you’re preparing for final inspection on a new home or conducting an energy audit for an existing property, we deliver the insight you need to take action with confidence.
The blower fan depressurizes the home to a standard test pressure of 50 Pascals. We measure the airflow (in cubic feet per minute, or CFM) required to maintain that pressure. This determines the Air Changes per Hour at 50 Pascals (ACH50)—a key metric for code compliance and energy modeling.
Testimonials
What Our Clients Are Saying
Jane Cooper
C2S Energy is an excellent company with a field supervisor who cares.(“Nelson”) They did an awesome job on my wall.. & the crew actually cleaned up after they were done. My wall …
Kristin Watson
David, Mario and Carlos arrived at our home on time and knew exactly what needed to be completed for our particular job. They were respectful, friendly, and worked every second …
Jacob Jones
I am very happy with David, Carlos and Mario from C2S Energy. David kept me updated as they worked insulting my home. They were punctual, courteous, and hard working …