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Has the Time Come to Re-Insulate Your Home?

December 08, 2016

As your home ages over the years, it becomes less and less effective in keeping out the cold air, and keeping in the warm air. Most homeowners can relate to this, and easily. And as the winter approaches, problem areas will surface, and it will become clear that it's now time to re-insulate the home. The truth is, there's much more to home energy efficiency than improving insulation - and that includes everything from air sealing, to weatherizing, to enhancing R-Values. An energy efficient home conserves energy, saves money on utilities, and provides home comfort. Conversely, a home that isn't energy efficient is simply wasting energy and wasting money. The thing is, there are a number of determining factors when deciding about insulation replacement. And clearly, most symptoms should be obvious to a homeowner. But there are times when more professional guidance is valuable - in assessing a situation, and providing a solution.

Air-conditioning and/or furnace running erratically

Insulation doesn't just keep the house warm and cozy - it also serves to maintain steady levels of temperature throughout the house, regardless of the outside weather. It means that the home is consistently warm in the wintertime and cool in the summer. Constant temperature fluctuations throughout the home are a sign that existing insulation may not be effectively performing.

Unusually high (and ever-rising) seasonal utility bills

One quick look at the monthly utility bills will reveal how well a home's insulation is performing. Another sure sign of performance is a comparison of bills from year to year. And although rates do change regularly, it's not difficult to assess spending trends. Anything unusual, like an upward trend in usage (without explanation) is a sign of problems (failing insulation/air leakage).

Visible icicles or ice dams on the outside of the building

A sure indicator of under-performing insulation is the forming of icicles from the home's eaves and gutters. Beyond the evident signs that something is wrong, icicles (and ice dams) can damage a roof, making for more work than just insulation. There are various technical reasons for icing but clearly poor insulation and significant air leakage in the attic are enough to be the cause.

Warm attic area and visible condensation throughout

If there is excessive moisture collecting and accumulating in the attic, and it shows up on walls or ceilings, this could be a sign that attic insulation is not performing its job. A warm attic will cause moisture to condense and therefore trickle down into the home. This is the right time to replace insulation, and to avert the potential for mould to grow and spread, creating bigger problems.

Variable temperatures from room to room in the home

It's not uncommon in a typical home for rooms to vary in temperature. However, big differences in temperature may suggest that air leakage and poor ventilation are contributing to poor energy efficiency. A well insulated home should have a uniform feel throughout every room. This is quite attainable, especially when air sealing, weatherizing, and insulation all work in tandem.

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.

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

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.

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.


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).


Baeumler ApprovedTM
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.


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?

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