Call Now 1.800.265.1914

Properly Air Sealing A Homes Provides Cost Savings

May 19, 2017

windows air sealing toronto gniIn a typical residential home, there's not much use for a cost/benefit analysis when it comes to air sealing and insulation. Any professional will tell you that in an effort to save energy in a home, nothing will do the job better than air sealing. In fact, industry statistics show that between 25% and 30% of heating and cooling energy is wasted because of air leakage. That includes leakage through the roof and/or attic, the basement, and any other breaches in the building envelope.Professionals will also attest that the best return-on-investment with home energy is air sealing. For example, properly air sealing a home with spray foam can save a few hundred dollars a year in heating and cooling costs.

Over the course of a few years, the savings can easily offset the cost of the project entirely. But the project itself must be professionally managed, particularly when the attic or basement are being air sealed. This is work that requires experience and expertise. In many cases, air sealing is coordinated with the installation of new or upgraded insulation. This will, of course, deliver the best overall results in terms of improved energy efficiency. But there's more - a properly sealed home will contribute to enhanced indoor comfort, better air circulation, and improved indoor air quality. As well, when a home is well sealed, air moisture is controlled and better balanced, which actually has a positive impact on the health of residents/occupants. Basic window caulking, weather-stripping, and draft proofing can deliver measurable results in terms of stopping air leakage - but these methods have their limitations.

For many homeowners, a good first step is to arrange for a "blower door test", which measures air infiltration levels in the home and determines where and how air is leaking. After the test, it's possible to strategize about resolving the air leakage, and decide which air sealing approach would deliver best results. For industry professionals, one of the most effective approaches to air sealing is spray foam. It's best known for its ability to insulate, but spray foam is also the ultimate air sealer. And while some homeowners might be tempted to employ a DIY approach with spray foam, this is work far better left to experts who are skilled with both product and installation. Properly installed, a spray foam application will deliver air sealing and insulation performance that is unmatched. Considered a premium quality product, spray foam does more than just seal and insulate. A good installation will serve as an air barrier and vapour barrier in one - it's an application that will stop both air leakage and moisture accumulation. This will also allow the HVAC system (heating, cooling, ventilation) to operate with improved performance throughout the winter and summer. Best of all, energy efficiency will be maximized, and seasonal utility bills measurably reduced. In the Toronto area, Great Northern Insulation offers home energy solutions to residential and commercial customers alike. For a FREE on-site assessment, call 1-888-778-9591, 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

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

Greater Toronto Area

2 Guided Court
Etobicoke, ON
M9V 4K6

TOLL FREE: 1-800-265-1914

GTA East

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

TOLL FREE: 1-800-265-1914

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

Niagara Region

25 Lincoln Ave
St. Catharines, ON
L2P 2C7

TOLL FREE: 1-800-265-1914


Great Northern Insulation - Better Business Bureau Profile.

Homestars Best of 2021 Award

Best of 2021

HomeStars has ranked Great Northern Insulation as a company that goes above and beyond in every aspect of business for the year of 2021.

Homestars Best of 2022 Award

Best of 2022

HomeStars has ranked Great Northern Insulation as a company that goes above and beyond in every aspect of business for the year of 2022.


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

Trusted for Over 40 Years

Over 40 Years in Business

At GNI, we service your project with the most experienced staff in the industry. Ongoing professional development is an obsession at GNI and we will not compromise at any level to bring to our customers the very best Installers, Sales Representatives, Customer Care Personnel, Field Superintendents, Estimating and Technical Support to your project.

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

January, 2021 regulatory phaseout of hydrofluorocarbons (HFCs) with the introduction of WALLTITE CM01. Using hydrofluorolefins (HFOs) with lower global warming potential (GWP) compared to HFCs, WALLTITE CM01 is the next generation of spray foam insulation.



Heatlok® Soya HFOTM leverages Honeywell’s latest Solstice® Liquid Blowing Agent technology. This new hydrofluoroolefin (HFO) blowing agent is the most environmentally conscious blowing agent produced to date, with a zero ozone depletion potential (ODP) and a global warming potential (GWP) of 1, which is more than two orders of magnitude (99.9%) lower than HFCs used in this industry.


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).

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 Home Efficiency Rebate Plus program offers up to $10,000 in home reno rebates – and Great Northern Insulation can pave the way.


Great Northern Insulation proudly abides by a renovation-specific Code of Conduct set by RenoMark™.


We are Verified & Bonded by eRenovate. When you choose to proceed with our services through their platform, you receive the gaurantees set forth through their program.

As Seen on Love It or List It

The GNI crew have been featured installing insulation on Love It or List It - have you seen our logo in an episode?

Climatizer Cellulose


CLIMATIZER PLUS cellulose insulation is manufactured from a minimum of 85% locally-sourced post-consumer recycled newsprint. Non-toxic additives are applied to the uniquely fiberized paper generating a building material with superior thermal and acoustic properties, as well as exceptional resistance to fire, moisture, mould and pests.

Please, enter a valid value

Incorrect values!