A bad installation can be costly: how AirGreen fixed an oversized GREE central heat pump in Terrebonne
In the world of residential HVAC, the proper sizing of a central heat pump isn’t a minor detail—it’s a fundamental requirement to ensure comfort, energy efficiency, and equipment longevity. In Terrebonne, a client recently called on our expertise after realizing that his newly installed GREE system, set up by another contractor, was causing more issues than comfort. At AirGreen, we took charge of this case with precision, fully restoring the installation—and more importantly, the client’s trust.
A typical case of an oversized unit: initial diagnosis
When our team arrived at the client’s home in Terrebonne, the first observations were clear: despite its rated power, the GREE central heat pump failed to regulate the temperature consistently. The home alternated between overheating and overcooling, leading to abnormal energy consumption, premature compressor wear, and clear discomfort for the occupants.
Our technical diagnosis quickly revealed the mistake: the 48,000 BTU system, installed in a home of less than 1,500 sq. ft., was drastically oversized. This type of setup causes short cycling, which significantly reduces the heat pump’s efficiency and affects indoor humidity control.
Why proper sizing is critical in HVAC
We often explain to our clients that the BTU capacity of a heating or cooling system isn’t about “the bigger, the better.” An oversized central heat pump:
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Doesn’t run long enough to properly dehumidify the air in summer.
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Consumes more electricity due to frequent starts and stops.
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Wears out faster.
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Doesn’t heat all zones of the house evenly.
At AirGreen, we always conduct a comprehensive thermal analysis of the home, taking into account orientation, insulation, air volume, window layout, and other key factors. This level of detail is what sets us apart in the residential and commercial HVAC sector in Terrebonne, Laval, Montreal, Longueuil, the North Shore and the South Shore.
The fix: our complete intervention process
Once we confirmed the system was improperly sized, we proposed a three-step solution, which the client immediately approved:
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Safe removal of the existing GREE system
Our certified technicians carried out the full deinstallation of the 48,000 BTU GREE system, recovering the refrigerant in full compliance with environmental standards. -
Installation of a high-efficiency 36,000 BTU GREE system
After thorough analysis, the GREE Flexx 36,000 BTU model (SEER 18, HSPF 10.5) was deemed ideal. This unit is eligible for Hydro-Québec’s LogisVert grants, allowing the client to receive $2,214 in financial aid, which significantly reduced the cost of the correction. -
Ductwork rebalancing and full system calibration
We resized several air ducts, reconfigured the main return, and reprogrammed the smart thermostat based on the client’s living habits. The result: even air distribution, controlled humidity, and an estimated 28% drop in electricity usage.
Client testimonial: comfort restored
"I didn’t know a heat pump could be too powerful. I thought I was investing in the best, but the system installed by the other company never worked right. As soon as I called AirGreen, I noticed a real difference: professionalism, clear explanations, and most of all, my home is finally comfortable—summer and winter."
— Jean-François D., homeowner in Terrebonne
Key takeaways for future HVAC projects
Our intervention in Terrebonne highlights a crucial truth: choosing a qualified contractor is just as important as choosing the right equipment. Here are a few tips to keep in mind:
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Always request a thermal load calculation before purchasing a central heat pump.
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Ask for a detailed installation plan, including duct sizing, outlet locations, and heat loss calculations.
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Check the company’s certifications and warranties offered.
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Make sure the system is eligible for grant programs like LogisVert or Chauffez Vert.
Why trust AirGreen
We don’t just sell machines—we deliver HVAC solutions that are optimized, durable, and truly tailored to your needs. Our team is made up of certified technicians, trained to the latest standards, and our approach is always personalized, focused on real-world performance and long-term client satisfaction.
Whether it’s for wall-mounted heat pumps, central systems, air conditioners, or HVAC maintenance, AirGreen is your trusted partner in Terrebonne, Montreal, Laval, Longueuil, the North Shore, and the South Shore.
We turned a problematic installation into a system that performs, saves energy, and provides real comfort. That’s the AirGreen commitment.