A technical challenge in a heritage residence
Westmount 's older homes combine architectural charm with technical constraints. At AirGreen , we were recently called upon to intervene in a heritage home where a client's Gree wall-mounted heat pump had stopped blowing cold air, leaving an elegantly paneled room without air conditioning in the midst of a heat wave.
Upon arrival, we were met with a unique environment: high ceilings, solid wood moldings, and limited access to the high-mounted wall unit. This type of configuration requires meticulous attention to detail to avoid damage to delicate surfaces while ensuring accurate system diagnostics.
Complete diagnosis of the Gree heat pump
As always, our first step was to carry out a thorough HVAC diagnosis . Here is a summary of the checks carried out:
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Indoor module inspection : filters slightly clogged and fins partially blocked by dust, reducing airflow.
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Fan operation analysis : The motor ran with a slight delay at start-up, suggesting a weak capacitor .
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Refrigeration cycle check : unstable pressures and evaporation temperature too low, possible signs of the start of a refrigerant leak .
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Leak test : after nitrogen injection and electronic detection, a micro-leak was detected at the base of the liquid line connection, on the outdoor unit side.
The diagnosis therefore revealed two concomitant problems: a gradual loss of refrigerant gas and an aging booster condenser.
Complete repair: precision and respect for aesthetics
Working on an old house with wall paneling requires a respectful approach to the decor. Our technicians have taken all necessary precautions: wall protection, use of suitable ladders, and no additional drilling.
Work carried out :
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Replacement of the indoor blower motor capacitor with a compatible original Gree model.
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Tightening of the flare fitting and replacement of the flared copper joint to eliminate the detected microleak.
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Pressure tested at 350 psi with nitrogen for 45 minutes to confirm perfect seal.
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Complete system recharge with R-410A refrigerant, according to the manufacturer's technical specifications.
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Cleaning filters and disinfecting coils using a mild, odorless antimicrobial product—ideal for wood interiors.
Once the repair was complete, the Gree heat pump restarted silently, delivering a steady, cool blast of air, with a 9°C temperature difference between inlet and outlet—proof of optimal performance.
Regained comfort and prevention for the future
The customer, delighted to find thermal comfort without excessive noise or the smell of dust, chose to subscribe to our annual AirGreen maintenance program .
We explained to him that, in heritage homes, air circulation and temperature fluctuations can increase stress on the refrigeration system seals. Regular maintenance is therefore essential to:
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Prevent microleaks .
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Clean coils without damaging wall finishes.
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Check the refrigerant charge and the compressor is operating correctly.
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Ensure the durability of the installation without compromising the aesthetics of the premises.
AirGreen expertise in Westmount and throughout Montreal
This intervention demonstrates the versatility and rigor of our team. Gree wall-mounted heat pumps, like those from Fujitsu, LG, Sharp, Midea or Zephyr , require a thorough understanding of modern refrigeration circuits and their on-board electronics.
Our certified technicians are trained to intervene quickly and efficiently on all types of residential and commercial HVAC systems , guaranteeing:
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Accurate diagnoses thanks to our digital tools.
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Durable and clean repairs , even in old buildings.
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Original parts that comply with manufacturers' recommendations.
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Post-intervention monitoring to ensure performance stability.
AirGreen, trusted partner for your HVAC systems
At AirGreen, we don't just repair: we restore comfort while respecting the environment and the unique character of each home.
Our goal is simple: to offer our clients in Montreal, Laval, Longueuil, the North Shore and the South Shore professional, transparent and human service.
For any Gree heat pump repair in Westmount or elsewhere in the metropolitan area, count on the expertise and rigor of AirGreen.