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Why Every Homeowner Should Get a Blower Door Test

September 18, 2017

Apart from all of the technical aspects, the bottom line with a blower door test is to determine how much air-leakage there is in a house. Today, a blower door test is probably the most relevant assessment tool for homeowners who want better energy efficiency and enhanced home comfort.

Clearly, an older house, with older insulation, is going to rate quite differently than a new house, with new insulation, and better air sealing. As a rule, a typical home should have a blower door test “number” that is less than its total square footage. And here, the numbers can matter a lot.

Home energy efficiency is all about airtightness – and any industry professional will confirm that there is no such thing as too tight. However, there is such a thing as an airtight house without adequate ventilation – it’s a house with very high moisture, pollutants, and even carbon dioxide.

The objective with a blower door test is to identify areas of a home that suffer from air leakage. These are areas that can be demonstrably improved with air sealing - in other words, where the building envelope can be sealed to enhance energy efficiency and boost insulation performance.

While a blower door test can accurately assess a home for air leakage, this is only the first step. The idea, of course, is to remediate air leakage once identified. When air leaks have been sealed (and insulated), energy efficiency is improved, and energy savings can be realized every month.

Improving energy efficiency going forward

Today, there is much more focus on home energy efficiency than in years gone by. As such, many homeowners are focused on optimizing their homes, reducing energy consumption, and saving on utilities around the year. A blower door test is an ideal place to start, carried out by an Energy Advisor who’s registered with Natural Resources Canada. With test results in hand, it’s possible to plan and execute various home improvements that will maximize home energy performance.

Homeowners should consider energy upgrades and retrofits to be an investment – there will be an upfront cost, but the long-term pay-off is realized in measurably reduced seasonal energy bills.

Air sealing

Sealing air leaks throughout a building envelope makes a dramatic difference with winter heating and summer cooling. Having the work done professionally will deliver the very best results.

Attic Insulation

High performance attic insulation prevents air leakage and improves HVAC performance from season to season. Quality insulation and professional installation will reduce annual utility costs.

Basement Insulation

Optimizing basement insulation will make a huge difference when it comes to overall energy efficiency (and home comfort). A well-insulated basement will dramatically reduce energy usage.

For homeowners who are committed to improving home energy efficiency, the professionals at Great Northern Insulation can offer a host of solutions. When a blower door test is complete, GNI can implement the necessary retrofits and ensure long term cost savings. For more information, contact GNI at 1-800-265-1914 or visit the company website at www.gni.ca .

Western Ontario

935 Keyes Drive
Woodstock, Ontario
Canada N4V 1C3

Phone: 1-800-265-1914

Fax: (519) 539-7946
TOLL FREE: 1-800-265-1914

Southwestern Ontario

7035 Industrial Drive
Comber, Ontario
Canada N0P 1J0

TOLL FREE: 1-800-265-1914

Muskoka, Haliburton, Northern Ontario

1027 Elwell Park Road
Gravenhurst, Ontario
Canada P1P 1R1

TOLL FREE: 1-800-265-1914

Central Ontario

29 Ferndale Industrial Drive
Barrie, Ontario
Canada L4N 9V5

TOLL FREE: 1-800-265-1914

GTA East

103 North Port Road
Port Perry, Ontario
Canada L9L 1B2

TOLL FREE: 1-800-265-1914

GTA & South Central Ontario

450 Industrial Dr,
Toronto (Milton), Ontario
Canada L9T 5A6

TOLL FREE: 1-800-265-1914

Eastern Ontario

1035 Moodie Dr #1,
Nepean, ON
K2R 1H4

TOLL FREE: 1-800-265-1914


259 Campbell Street
Sarnia Ontario
Canada, N7T 2H3

TOLL FREE: 1-800-265-1914

Niagara Region

6260 Don Murie St
Niagara Falls, ON
L2G 0B4

TOLL FREE: 1-800-265-1914


Great Northern Insulation - Better Business Bureau Profile.


Best of 2017

From reputation to responsiveness, HomeStars consistently ranks Great Northern Insulation at better than 95% for customer satisfaction. Thanks to everyone for the great ratings! 

HomeStars 2018

Best of 2018

For the second year in a row, HomeStars consistently ranks Great Northern Insulation at better than 95% for customer satisfaction. Thank you again to everyone!

Homestars Best of 2019 Award

Best of 2019

For the third year in a row, HomeStars ranked Great Northern Insulation at better than 95% for customer satisfaction.

Homestars Best of 2020 Award

Best of 2020

For four years now, HomeStars has ranked Great Northern Insulation at better than 95% for customer satisfaction.


GNI is the Authorized & Trusted Insulation and Air Sealing Installer for Lowe’s

Enenrgy Savers

Energy Saving

Energy saving and energy efficiency is easier than one might think. Great Northern Insulation helps to identify performance issues, while taking advantage of improvement opportunities.

100% Canadian

100% Canadian

Great Northern Insulation is recognized as Canada's largest full-service insulation contractor. GNI is 100% Canadian owned, proudly serving Ontario customers since 1980.

Foam Masters

Do it right the first time
- with foam mastersTM

WALLTITE® ECO™ is a high-performance system, professionally installed by certified and approved specialists. Its C.C.M.C. approved (Canadian Construction Materials Centre) - with product quality guaranteed - and with installation by highly trained experts with the technical know-how to do the job right, the first time.


Gold Certification promise

GREENGUARD® Gold Certification ensures the strictest criteria for low-level chemical emissions. Certified products are safe for individuals with sensitivities (children/elderly) and safe for use in school environments and health-care facilities. The product certification is widely recognized by the LEED Rating System (Leadership in Energy/Environmental Design).

Insulthane Extreme

Insulthane® Extreme

For the ultimate in high performance spray foam insulation, Insulthane® Extreme is the professional choice for residential, commercial, and industrial application. With improved thermal performance over other products, Insulthane® Extreme has an exceptionally low Global Warming Potential (GWP). Considered environmentally friendly, this next generation spray foam insulation is non-ozone depleting, and exceeds specifications of other HFC product alternatives.


Multi-attribute product certification

ECOLOGOTM is an accredited sign of environmental performance – holistic – green – sustainable - and compliant with strict, third party standards. Life cycle criteria for product certification may include manufacturing and operations; health and environment; product materials and performance; and product innovation, development, and management.


3MTM products.
Quality + Performance = Savings

3MTM energy-saving products are designed to keep warm air in, and cold air out, while keeping energy bills down. Products optimize energy efficiency in buildings and homes; improve indoor environment for occupants; and effect the reduction of seasonal energy costs. 3M products are authorized for LEED credits (Leadership in Energy/Environmental Design).


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Professional, Certified and Insured

Baeumler ApprovedTM gives you peace of mind when connecting with contractors, trades and home service providers. All Baeumler Approved members have demonstrated high quality work for customers and other trade professionals. Members must also have Workers Compensation, liability insurance of at least $1,000,000 and prove professional certification.

Holmes and Holmes

Holmes and Holmes


Mike Holmes and his son Mike Jr. (MJ) convert MJ’s bachelor bungalow into a two-storey home for MJ and his girlfriend Lisa. Choosing the newest materials and build techniques, the father and son team follow Mike’s famous motto – “Make it right.” The show can be watched on HGTV and DIY Network.


Enbridge Incentives

The Energy Conservation Program provides incentives of up to $1,600 to customers who achieve energy efficiency and fuel savings – and Great Northern Insulation can pave the way.


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