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Getting Ready For the Hot Summer. Insulation Will Keep the Cool Air In

June 26, 2016

Most homeowners, especially in the northern climes, associate insulation with keeping the home warm and comfortable during the winter. At the same time, there's not much focus given to home insulation that keeps things nice and cool in the summer. In fact, when it comes to residential air conditioning, there's much to say for a home that is well sealed and well insulated. When a home effectively retains the cool air provided by the air conditioning unit, indoor comfort levels are maintained. And retaining that cool air (while keeping warm air outside) comes from a home that is well sealed and properly insulated. In short, cool air does not leak out and warm air does not come in. The result - the HVAC system performs with much better efficiency. Homes that are not properly sealed allow air to leak. In winter it's heated air and in summer it's cooled air - but in both cases energy is being wasted, and utility bills are overly high. Air leakage can also contribute to inconsistent temperatures from room to room. And here, it's wise to have the home professionally evaluated for air leakage, as well as possible remedy solutions. Today, many home improvement centres promote DIY solutions for insulation matters. While this approach might be money saving for a homeowner, a professional approach is much more preferable. This applies equally to checking for air leaks, removing aging insulation, or installing new insulation. As it is, the professionals have the equipment and expertise to do it right. Beyond sealing, it's inadequate insulation (or poorly installed insulation) that will cause a home to be energy inefficient. The HVAC system will run longer than need be to heat and cool the home, and utility bills will therefore be higher than need be. On the flip side, high quality insulation will ensure that the HVAC system operates at peak, saving money on heating and cooling bills. Generally speaking, insulation with higher R-Value will do a better job keeping cooled air inside, and keeping warmer air outside. This is particularly true when high R-Value is installed in attics and roofs. But it can also make a difference when basements and garages are well insulated. The idea, of course, is to create an effective air barrier that performs well in winter and summer. A sealed home also requires appropriate ventilation. When a home is well ventilated, the building envelope is allowed to breathe, providing much required air circulation. This has a positive effect on the consistency of indoor temperatures throughout the year, and again, allows for balanced performance of the HVAC system. This dynamic also contributes to better energy usage. At Great Northern Insulation, winter and summer comfort is about getting the home effectively sealed, suitably insulated, and properly ventilated. GNI professionals do it all - from home energy assessments, to insulation removal, to re-installation. GNI assures full customer satisfaction, with the highest quality insulation products, superior workmanship, and sound warranties.

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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