At AirGreen, we’re frequently called out during winter in Laval to fix a problem that’s as frustrating as it is common: a wall-mounted heat pump that simply doesn’t heat enough when it’s -20°C, -25°C, or even -30°C outside. And yet, these systems are supposed to be high-performing. So why are so many clients reaching out with this exact issue? In this article, we explain the real reasons your wall-mounted heat pump seems ineffective in deep cold, and more importantly, the fast, concrete solutions we implement in Laval to restore comfort.
A Cold Snap in Laval: A True Stress Test for Your HVAC System
When the mercury drops below -20°C, most entry-level wall-mounted heat pumps hit their technical limits. At those temperatures, some compressors lose up to 50% of their heating capacity. The result?
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Rooms that stay cold, even when the system is running.
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A compressor that runs constantly with no real effect.
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Skyrocketing electricity usage… with no added comfort.
In these conditions, choosing the right wall-mounted heat pump model is crucial for the Laval region.
The Main Reasons Behind Poor Performance in Winter
1. Model not designed for Quebec’s harsh climate
Many units sold in big box stores or online aren’t built to handle the extremes of our winters. For example, a “standard” wall-mounted heat pump can start losing effectiveness at just -10°C. In Laval, that’s simply not good enough.
AirGreen Solution: We recommend high-performance models like the Gree Extreme 18,000 BTU or the Fujitsu KZAH R-32, which maintain full heating capacity down to -25°C, and some models even down to -30°C.
2. Unit is too small for your space
A heat pump that’s undersized for your square footage will never meet your needs during a deep freeze. This issue is even worse in poorly insulated homes or those with high ceilings.
Real example in Laval: In January 2024, we replaced a 12,000 BTU unit with an 18,000 BTU Gree Extreme in a home in Vimont. The result? Comfort restored by the very next day and a 25% reduction in backup heating usage.
3. Faulty HVAC installation
Even a top-tier unit will underperform if it’s poorly installed:
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Refrigerant lines too long.
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Improper drainage.
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Unsealed wall penetrations.
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Poor indoor unit placement.
AirGreen, with our RBQ and TEQ-certified technicians, ensures precise, tested, and climate-adapted installations specifically for Laval homes.
How AirGreen Quickly Solves This Type of Issue in Laval
1. Full, fast on-site diagnosis
We carry out:
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A real-world performance check of your unit in freezing conditions.
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A heat load calculation tailored to your home.
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Inspection of the electrical setup, outdoor unit, and indoor layout.
This service is often done within 48 hours during cold snaps.
2. Replacement with a certified cold-climate model
Our most common recommendations in Laval:
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Gree Extreme: reliable down to -30°C, ideal for harsh winters.
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Fujitsu KZAH R-32: consistent performance, eco-friendly refrigerant, very quiet.
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Bosch BOVA/IDS Premium: advanced inverter technology, eligible for over $2,500 in LogisVert rebates in Laval.
3. Adjusting the existing installation when possible
In some cases, it’s enough to:
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Optimize indoor unit positioning.
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Improve insulation around wall penetrations.
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Add a second wall unit in another room.
This quick and cost-effective approach often restores acceptable comfort without replacing everything.
Rebates and Assistance Available in Laval to Improve Your Wall-Mounted Heat Pump
AirGreen helps every client navigate the available rebate programs, including:
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Hydro-Québec’s LogisVert: up to $2,500.
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Municipal or energy transition programs based on income and building type.
These incentives can cut the cost of a new installation by 30% to 50%.
Testimonials from AirGreen Clients in Laval
“In the middle of February, our heat pump just wasn’t heating anymore. AirGreen came within 48 hours, recommended a cold-climate model, and even helped us apply for the rebate.”
— Mr. Bernard, Laval-des-Rapides
“Their technician immediately spotted an installation error. They fixed everything without having to replace the unit, and we were comfortable again that same evening.”
— Ms. Letellier, Chomedey
Why Choose AirGreen in Laval for Your Wall-Mounted Heat Pump?
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Fast service, even during extreme cold.
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A local team specialized in Laval’s climate.
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Expertise in both residential and commercial HVAC.
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RBQ and TEQ certified installations.
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Full support for rebate applications.
Don’t wait for your system to completely give out.
Weak performance during cold weather isn’t something you just have to live with. At AirGreen, we act fast in Laval to diagnose, fix, and upgrade your HVAC system—so you can enjoy a warm, stress-free winter.
Call us now for a quick diagnostic or rapid replacement of your wall-mounted heat pump in Laval.