Don’t Just Renovate, Retrofit!
If you’re living in a home that’s 75 years or older, you’re likely no stranger to its quirks: the drafty windows, the uneven heating, the rooms that never quite feel comfortable, no matter how much you fiddle with the thermostat. When renovation time comes around, it’s tempting to focus on the visible upgrades like new countertops, fresh paint, and modern fixtures. But here’s what most homeowners miss: without addressing your home’s energy performance, you’re leaving money on the table and comfort on the floor. A deep energy retrofit isn’t just about lowering utility bills, though that’s a welcome bonus. It’s about transforming your historic home into a space that’s genuinely comfortable, healthier to live in, and resilient enough to serve you well for decades to come.
The Hidden Problems in Older Homes
Homes built 75+ years ago were constructed in a different era, one where energy was cheap and building science wasn’t yet focused on thermal performance. These homes typically suffer from poor or deteriorated insulation, with many having little to no insulation in walls, and what’s there may have settled or degraded over time. But the real culprit is massive air leakage.
Air leaks through countless gaps around windows and doors, where walls meet foundations, at electrical outlets, through floor joists, and in countless other hidden spots. Your expensive heated or cooled air is constantly escaping while outdoor air infiltrates, bringing humidity, allergens, and temperature extremes with it. Add outdated windows, poorly sealed doors, and inefficient mechanical systems to the mix, and you have a home that’s working against you rather than for you.
Comfort and Savings You Can Feel
The most immediate benefit you’ll notice after a proper retrofit is comfort. No more cold floors in winter, no more rooms that are 10 degrees warmer than others, no more standing next to a window and feeling the draft. A well-insulated, properly air-sealed home maintains consistent temperatures throughout, making every room usable year-round.
Beyond comfort, a comprehensive retrofit can reduce your heating and cooling costs by 40 to 60 percent or more. For a home with high utility bills, that can mean thousands of dollars in savings annually. Over the decades you plan to live there, those savings compound significantly and often exceed the initial investment in the retrofit.
Health, Value, and Long-Term Protection
A proper deep energy retrofit also dramatically improves indoor air quality. Older homes often have poor ventilation strategies, either too leaky or too sealed up without mechanical ventilation. A comprehensive retrofit includes controlled ventilation, ensuring fresh air comes in while stale air and moisture are exhausted. This reduces mould risk, eliminates musty odours, and creates a healthier environment for your family. By controlling moisture and air movement, you also protect your home’s structure, reducing the risk of hidden rot, mould growth, and ice damming that can lead to expensive repairs down the line.
Energy-efficient homes are increasingly desirable in the real estate market, and with energy prices trending upward, you’re making a long-term investment in predictable, lower operating costs that insulate you both literally and financially from future price shocks.
The Systems Approach to Retrofitting
The most effective retrofits address your home as a system rather than tackling issues piecemeal. Air sealing is the foundation of everything else because without it, insulation can’t perform optimally. Air leakage undermines your HVAC system, creates moisture problems, and wastes energy. Once air sealing is complete, you can upgrade insulation in attics, walls, basements, and crawl spaces to meet or exceed current code requirements. High-performance windows and doors come next, along with right-sized, efficient heating and cooling systems like heat pumps. Finally, mechanical ventilation systems ensure fresh air without energy waste, giving you complete control over your indoor environment.
Why AeroBarrier Changes Everything
Here’s where many retrofits fall short: traditional air sealing methods are labour-intensive and often incomplete. A skilled crew can caulk, foam, and weatherstrip for days, yet still miss hidden leaks in wall cavities, around penetrations, and in hard-to-reach areas. That’s where AeroBarrier becomes a game-changer. AeroBarrier is an automated air sealing technology that uses a computerized system to seal a home to a specific, measurable target. A non-toxic, water-based sealant is aerosolized and distributed throughout the home while the building is depressurized with fans. The sealant particles naturally seek out and seal air leaks from the inside, including the tiny cracks and gaps that are virtually impossible to seal manually.
The AeroBarrier Advantage for Historic Homes
In older homes, many leaks are hidden behind finished walls, in floor cavities, or in inaccessible attic areas. AeroBarrier finds and seals these leaks without demolition, and the system monitors air leakage in real-time, continuing to seal until your target tightness is achieved. You get a certified report showing exactly how tight your home is, with no guesswork involved. What might take days of manual sealing can often be accomplished in hours with AeroBarrier, delivering more comprehensive results.
Most importantly, air sealing must come before insulation, and AeroBarrier ensures your expensive insulation upgrade performs as intended by eliminating the air pathways that would otherwise undermine it. Once you’ve achieved a tight envelope, you can properly design and install mechanical ventilation, giving you true control over your indoor air quality rather than relying on random leakage.
Investing in Your Home’s Future
Your 75-year-old home has good bones and character that newer construction can’t replicate. Yes, a deep energy retrofit is a more significant investment than cosmetic updates, but when you consider the cumulative savings, the dramatic improvement in comfort, the health benefits, and the extended lifespan of your home’s systems and structure, it’s one of the smartest investments you can make.
By combining that historic charm with modern building science and technologies like AeroBarrier, you create something truly special: a home that honours its past while performing for the future. If you’re planning renovations anyway, now is the perfect time to go deeper. Your future self, living comfortably in a home that costs a fraction of what it once did to heat and cool, will thank you.
If your older home needs not just a renovation, but indeed a full retrofit, contact Airtight Home Technologies today for a free quote on an AeroBarrier installation!
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Airtight Home Technologies Inc. was incorporated in 2019, by Gary Sharp and is Eastern Ontario’s AeroBarrier dealer. Gary is a professional engineer with over 25+ years of experience.
