Choosing the Right Wall-Mounted Heat Pump for a Century-Old Home in Montréal: A Challenge That Calls for Real Expertise
In Montréal, century-old homes are everywhere—rich in history, full of charm, but often complex when it comes to integrating a modern HVAC system. At AirGreen, we frequently work in these older homes, where installing a wall-mounted heat pump requires careful evaluation of architectural constraints, historic building materials, outdated insulation, and above all, customized heating and cooling needs tailored to these unique spaces.
In this 2026 guide, we present our selection of the 5 best wall-mounted heat pumps we’ve installed in Montréal’s century-old homes, complete with real-world insights from the field.
Why Do Century-Old Homes Require a Careful Heat Pump Selection?
1. Often Weak or Uneven Insulation
Older homes rarely meet today’s insulation standards. The result: major heat loss in winter and overheating in summer. That’s why you need units that can intelligently modulate their power, like those with Inverter technology.
2. Stone or Brick Walls That Complicate Installation
Installing a wall-mounted AC in a brick or stone home requires special tools, reinforced mounts, and meticulous workmanship to prevent air or moisture infiltration.
3. Sometimes Outdated Electrical Systems
We often encounter homes with limited electrical panel capacity. This means selecting efficient 115V models, or units with low power consumption, which steers the choice toward specific models.
Our Pick of the 5 Best Wall-Mounted Heat Pumps for Century-Old Homes in Montréal
1. MIDEA22 | 12,000 BTU | 115V
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Pros: Works with homes that have limited electrical capacity. Very quiet. Excellent energy efficiency.
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AirGreen Insight: Successfully installed in a 1910 duplex in Hochelaga, with no electrical upgrades needed.
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Cons: Not suited for large rooms.
2. GREE Lomo 23 | 18,000 BTU
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Pros: Great heating capacity for homes with high ceilings. Operates down to -30°C. Reliable Inverter technology.
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Typical Installation: Century-old home in Le Plateau-Mont-Royal, with structural stone walls. Reinforced anchors with chemical fasteners used.
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Cons: Slightly larger outdoor unit.
3. FUJITSU KZAH | 9,000 to 18,000 BTU | R-32
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Pros: Eco-friendly R-32 refrigerant, great performance-to-consumption ratio. Eligible for LogisVert subsidies.
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Field Report: Excellent performance in a partially renovated wooden home in Westmount.
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Cons: Requires regular maintenance to maintain peak performance.
4. SHARP ZU1 | 15,000 BTU
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Pros: Very discreet. Enhanced air filtration. A solid choice for bedrooms or offices in older homes.
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AirGreen Project: Installed in a 1922 home in Outremont, with no visual intrusion thanks to its compact design.
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Cons: Limited to mid-sized rooms.
5. BOSCH BIVA | 12,000 to 24,000 BTU | R-454B
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Pros: Very low environmental impact. High heating performance. Excellent humidity control.
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AirGreen Installation: In a century-old home in the Mile-End, where brick wall humidity was a key concern.
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Cons: Requires well-designed drainage for the outdoor unit.
AirGreen’s Advice for Installing in Older Homes
Perform a Full Thermal Assessment
Before anything else, we always start with a thermal load calculation, factoring in building structure, orientation, original materials, and any recent renovations.
Use Specialized Fasteners
In brick or stone homes, we use threaded rods, chemical anchors, and support plates to prevent damage to structural walls.
Install a Discreet Condensate Pump
Older homes often don’t allow for proper gravity drainage. That’s why we install compact, silent, and discreet condensate pumps, seamlessly integrated below the unit.
What Our Montréal Clients Are Saying
“We thought our 1905 home in Rosemont couldn’t handle a wall-mounted AC. AirGreen found the perfect solution with a 115V Midea. No electrical work needed—and no more unbearable summer heat!”
— Mr. and Mrs. Lefebvre
“In our triplex in Verdun, the installation was done without any damage, despite the brick walls. The result is both discreet and efficient.”
— Claire T.
Available Grants for Older Homes
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LogisVert Program (Hydro-Québec): up to $1,860 for certain heat pumps.
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Rénoclimat Program: applies if combined with insulation work.
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Municipal credits: some South Shore cities offer additional incentives.
A Heat Pump Tailored for Your Century-Old Home? Absolutely—And It’s Essential
With the right equipment and a professional installation, it is entirely possible to equip a century-old home in Montréal, Laval, Longueuil, North Shore or South Shore with a wall-mounted heat pump that’s quiet, efficient, and perfectly suited to your comfort needs. At AirGreen, we’ve developed the expertise to handle every technical challenge these installations may present. Don’t let historic charm come at the expense of modern comfort.
Own a century-old home and looking to install a wall-mounted heat pump? Contact AirGreen today for a free personalized assessment.