Blower Door Testing
Seal in Comfort & Save on Energy with Blower Door Testing in St. Cloud, Minnesota
Proudly Providing Inspection Services for St. Cloud, Monticello, Sartell, St. Michael, Buffalo, Sauk Rapids, Rockville, Cold Spring, and Surrounding Areas
If you’re looking to create a more energy-efficient and environmentally friendly home, blower door testing is essential. Blower door tests, often performed in conjunction with a standard buyer’s inspection, identifies areas of air leakage that may be compromising your comfort, increasing your utility bills, or even affecting your health. At NPI St. Cloud, we offer professional blower door testing to help you build a safer, more cost-effective home.
What Is a Blower Door Test?
A blower door test measures how airtight your home is. During the test, a powerful, calibrated fan is mounted in an exterior doorway or window. Once all other doors and windows are closed, the fan is turned on to either pressurize or depressurize your home. This change in air pressure reveals where air is leaking in or out—often through cracks, gaps, or poorly sealed areas.
Using digital gauges and airflow measurements, our inspectors determine how much air leakage is occurring and whether it falls within acceptable limits. In states like Minnesota, blower door testing is required by the Residential Building Code to receive a certificate of occupancy for newly built or remodeled homes.

What Are the Benefits of Blower Door Testing?
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Lower Energy Costs.
One of the largest expenses in any household is heating and cooling. If your home is leaking air, your HVAC system is forced to work harder to maintain the desired temperature. A blower door test helps you pinpoint leaks so you can seal them, making your system more efficient and your heating and cooling bills more affordable. -
Improved Indoor Comfort.
Sealing air leaks not only saves money—it also keeps temperatures more stable and eliminates uncomfortable drafts. After addressing the problem areas identified in your blower door test, you’ll likely notice your home feels cozier with little temperature variation from room to room. -
A Healthier Home Environment.
Air leaks can allow outdoor pollutants, allergens, and moisture to enter your home, potentially leading to respiratory issues or mold growth. By identifying and sealing these leaks, blower door testing contributes to a cleaner, healthier indoor living environment for you and your family.
Is a Blower Door Test Required?
In many areas—including Minnesota—a blower door test is required to obtain a certificate of occupancy for new builds or major renovations. But even if it’s not legally required for your property, it’s still a smart investment for any homeowner looking to improve energy efficiency and indoor air quality.
Schedule Your Blower Door Test Today
Whether you’re finishing new construction, planning a renovation, or simply want to improve your home’s performance, a blower door test is a crucial step in optimizing your home’s energy efficiency and comfort. Call NPI to learn more or book your blower door test today. Let us help you seal in comfort—and savings.