Published on August 12, 2026

What Is a Blower Door Test (+ Signs You Might Need One)

Cold rooms, high National Grid bills, and drafts near the windows usually aren't three separate problems. They're symptoms of air leaking out of the house somewhere you can't see. A blower door test finds the exact source, whether it's an attic penetration, a rim joist, or an old window frame, and turns a vague sense that "the house feels drafty" into a specific, prioritized fix list.

Energy Efficiency | Doors | Windows

A professional conducts a blower door test in a residential home.

Summary

A blower door test measures exactly how airtight a home is by depressurizing it with a calibrated fan and tracking air leakage in ACH (air changes per hour). For Central New York homeowners in older housing stock, common in Syracuse, Auburn, Utica, and Rome, it’s often the fastest way to explain high bills, cold rooms, or drafts that persist even after window or insulation upgrades. Results also connect directly to NYSERDA and EmPower+ rebate eligibility.

Time to Read	~5 minutes
What You’ll Learn	What a blower door test actually measures and how it works How ACH scores are used to judge a home’s airtightness The five most common signs a home needs testing Why pre-1990s CNY homes are especially likely to benefit
Next Steps	Check your home for the warning signs of air leaks Schedule a blower door test with Patriot Home Solutions Use your results to prioritize air sealing before bigger upgrades

If you’ve ever stood in your living room in January wondering why one corner never warms up, you’re not imagining it. Maybe your National Grid bill keeps climbing even though you haven’t touched the thermostat, or maybe you can feel a draft near the front door but can’t find where it’s coming from. For homeowners across Central New York, these are all signs that your windows or doors are leaking air. But you won’t know for sure without a blower door test.

Patriot Home Solutions offers blower door testing as part of a whole-home approach to finding out exactly where your house is losing energy, before recommending any other work.

What a Blower Door Test Measures

A blower door test is a standardized diagnostic test that measures how airtight your home really is. Instead of guessing where drafts come from, an energy auditor mounts a calibrated fan into an exterior doorframe, usually your front or back door. That fan depressurizes the house, drawing air out and creating a pressure difference between the inside and the outside. As it runs, it measures the volume of air flowing in through every gap, crack, and unsealed penetration in your home’s exterior.

The result is a real, quantifiable reading of your home’s air leakage, not a walkthrough impression or a rough estimate.

Understanding Your Blower Door Test Results

A tablet displaying a house efficiency rating chart, lying on a table with building blueprints. The screen shows a scale from A to G, with green highlighting the top grades.

Blower door results are reported as ACH (air changes per hour). This number tells you how many times the total volume of air in your home is replaced by outside air over the course of an hour. The lower the ACH, the tighter your home. The higher the number, the more energy you’re losing to leaks.

Energy auditors, NYSERDA programs, and contractors like Patriot Home Solutions all use ACH to identify air-sealing priorities and measure improvements after upgrades are made to homes.

Term	What It Means
ACH	Air changes per hour. How many times your home’s total air volume is replaced by outside air in an hour
Lower ACH	A tighter home, with less energy loss
Higher ACH	A leakier home, with more energy waste

Signs You Might Need a Blower Door Test

A close-up of an electric bill on a table with a pen, a calculator, and a pair of reading glasses close by.

A few common signals tell Central New York homeowners that it’s time to call the professionals and schedule a blower door test, including:

Rooms that are always colder or hotter than the rest of the house
High National Grid or NYSEG bills that don’t match your thermostat settings
Drafts near windows, doors, outlets, or the attic hatch
Ice dams forming on the roof every winter
Ongoing discomfort even after replacing windows or adding insulation

That last one surprises a lot of homeowners. New windows and fresh insulation help, but they don’t fix leaks somewhere else in the home. A blower door test shows you where the air is actually escaping so you’re not guessing at the next fix.

Related Reading

Why Many Central New York Homes Benefit From Blower Door Tests

An older, 1970s-era home in a quiet suburban residential neighborhood in Central New York, blanketed in snow.

Homes built before modern energy codes, generally before the 1990s, are common across Syracuse, Auburn, Utica, and Rome. Syracuse’s median home was built around 1958. Utica’s median home dates back to around 1947, making it the oldest housing stock in Patriot’s service area. Construction methods from those eras didn’t account for today’s air-sealing standards, so leaks are often built into the structure itself rather than caused by wear and tear alone.

Combine that older housing stock with a five-month Central New York heating season and the lake-effect wind chill many homeowners deal with, and it’s easy to see why air leakage adds up fast on a winter energy bill.

What Happens After Your Blower Door Test

Once your technician has completed your blower door test, they’ll walk you through the results in plain language, not just a printout of numbers. You’ll see your home’s ACH score, along with a breakdown of exactly where the air is escaping. Common problem areas include:

Window and door frames
Attic penetrations
Plumbing chases
Recessed lighting fixtures
Basement rim joists

Your technician will also explain which leaks are worth tackling first. Some have a much bigger impact on comfort and energy costs than others, so there’s no need to fix everything at once. Instead of wondering why the house feels drafty, you’ll leave with a practical list of the areas that deserve attention first.

How Patriot Builds a Repair Plan From Your Results

contractor with a clipboard talking to a homeowner in a living room

Once the leaks are identified, Patriot Home Solutions uses the results to build a customized efficiency plan rather than recommending the same package to every homeowner. The sequence usually looks like this:

Air sealing first, since it’s the lowest-cost fix with the most immediate impact
Insulation next, to hold onto the conditioned air you’re no longer losing
Window and door upgrades if the test and a follow-up assessment point that direction

This sequencing matters because, for us, it’s about fixing the leaks before you spend money on bigger replacements, not upselling a full project when the data doesn’t support it.

The NYSERDA and EmPower+ Connection

A blower door test can also open the door to rebates and other incentives. Many NYSERDA programs either require or recommend one before energy-efficiency upgrades move forward, so the test often becomes part of the process rather than just a way to find air leaks.

If you qualify, EmPower+ (formerly EmPower NY) may cover certain upgrades at no cost. Depending on the improvements you make afterward, you may also be eligible for incentives on qualifying windows and doors. Patriot can help you determine whether you meet the program requirements, while a tax advisor can answer questions about credit eligibility.

Scheduling a Blower Door Test with Patriot

A blower door test with Patriot Home Solutions starts with a walkthrough of your home, followed by the test itself, and then a conversation about what the results mean for your home specifically. There’s no pressure to commit to any work on the spot. The goal is to give you real data so you can decide what’s worth doing next, and when.

If your home never seems to stay comfortable, or your energy bills don’t match how you use your heating system, a blower door test can help explain why. Contact Patriot Home Solutions today to find out where air is escaping and what your options are from there.

By Andy Fiorini | Owner

Andy went to school for Construction Management but ended up graduating with a degree in Business Administration. He worked 15 years in the business world (Corporate America) before leaving to start his own business, which he has owned since 2019. Andy holds several BPI (Building Performance Institute) certifications and Patriot Home Solutions is a Gold Star BPI contractor.