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Keep your House Warm this Winter & More Energy Efficient

January 10, 2018

Whether it’s minus 10 or minus 20, you want to keep your house warm this winter. And while firing up the furnace might be an immediate reaction, there are many other approaches to keep your house warm this winter. The fact is, every upgrade will make a difference, and every effort will contribute to energy efficiency and reduced heating bills.pre drywall blower door test

Blower Door Test

A blower door test determines the volume of air-leakage in a house. It’s the best assessment for identifying energy efficiency improvements and the best “road map” for making upgrades. From air sealing to thermal insulation, a blower door test will divulge areas of the home that are not performing in terms of energy efficiency. The results will highlight energy upgrades that will deliver the best return-on-investment (for winter and summer). 

Attic Insulation

Quality home insulation offers perhaps the best line of defense to keep your house warm this winter. When a home is unusually cold in the winter, it’s time for a remedy, and attic insulation is a good place to start. With proper air sealing, and high performance insulation, winter heating and summer cooling costs can be reduced dramatically. Attic insulation is one of the most cost-effective home improvements that every homeowner can make.

Sealing Air Leaks

Energy efficiency relies on the airtightness of the “building envelope”. Therefore, to keep your house warm this winter, addressing air leakage should be a priority. Sealing air leaks throughout the house will do a number of things – insulation will perform better; air moisture will be better regulated; heating/cooling will not be wasted; and energy consumption will be reduced. In terms of dollars and cents, the savings can offset the cost of the work.

Ice Damming

When ice amasses around the edge of a roof, “ice dams” are created and can be problematic. It happens because the attic is warm and roof snow melts. Here, it’sice damming services prevention icicles roof important to stop heat transfer into the attic and roof. Ice damming indicates that attic insulation is either poorly installed or just inadequate – it therefore requires retrofitting. There may also be an issue with air leakage, which means that the attic and roof must be sealed more effectively.


Proper weatherization will certainly keep your house warm this winter. Weatherizing windows and doors dramatically reduces drafts and air leakage, and therefore decreases overall energy consumption. With a professional approach to weatherization, a wide range of retrofits can be implemented. This is where a spray foam application can effectively provide an air barrier and moisture barrier, ensuring a well-sealed “building envelope”.

Winter in Canada can be quite costly when it comes to heating a home. So making improvements to home energy performance can make a difference in both home comfort and dollar savings. In choosing improvement priorities, industry professionals agree that insulating the attic is likely the most effective way to ensure energy efficiency while reducing energy consumption. In fact, when a home is well sealed, well insulated and well ventilated, the savings on seasonal utility bills are impressive. Bottom line, the savings often “pay down”  the upfront costs of an upgrade.

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.

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