A service call on the roof of a typical Montreal building
At AirGreen , we regularly receive service calls for wall-mounted heat pumps installed on the flat roofs of multi-unit buildings in urban neighborhoods like Outremont . This type of installation, while common in Montreal, presents unique challenges: sun exposure, debris accumulation, extreme thermal cycles between summer and winter—all factors that can influence a unit's performance and durability.
Recently, we were contacted by the manager of a residential building whose Goodman wall-mounted heat pump was no longer adequately cooling some units. Our team conducted a complete inspection of the system on-site.
Diagnosis: Loss of efficiency and refrigerant pressure problem
Upon arrival on the roof, we noticed several outdoor units installed side by side , all supplying different apartments. The affected unit, a Goodman DS series , was showing signs of overheating and a compressor operating in overload . Using our diagnostic tools, we confirmed abnormal refrigerant pressure —a typical symptom of a minor leak in the refrigeration circuit .
We also observed slight oxidation on the condenser flare fittings , a common weak point on rooftop installations exposed to wind and humidity.
Steps of repair
Our certified technicians proceeded methodically:
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Complete analysis of the refrigeration circuit : verification of pressures, temperatures and flow rates.
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Leak detection : using an electronic detector and bubble solution.
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Repair of the defective fitting : replacement of the flare, cleaning of the lines and tightening according to Goodman standards.
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Nitrogen leak test : maintain pressure for 30 minutes to ensure no leaks.
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R-410A refrigerant recharge : precise dosage according to the manufacturer's nameplate.
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Final performance test : measurement of evaporation and condensation temperatures to validate the efficiency found.
Result: restored comfort and optimized performance
After restarting, the Goodman heat pump returned to its original performance. The compressor was now operating at normal load, and the indoor airflow was stable. The manager immediately noticed a difference: the indoor temperature in the units had returned to a uniform state, and compressor noise had significantly decreased.
We also recommended biannual preventative maintenance to the client, which is particularly essential for units located on flat roofs exposed to the elements. This type of maintenance allows for:
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Clean the coils and evaporators.
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Check the electrical connections.
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Prevent micro-leaks of refrigerant.
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Optimize compressor life.
Why call AirGreen for your wall-mounted heat pump repairs in Montreal?
Goodman wall-mounted heat pumps are renowned for their robustness, but like any HVAC system, they require rigorous maintenance. At AirGreen, we respond quickly throughout Greater Montreal —whether you're in Laval, Longueuil, the North Shore, or the South Shore —to diagnose, repair, and optimize your equipment.
Our interventions are distinguished by:
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Technicians trained and certified on all brands, including Goodman, Gree, Midea, Fujitsu, Sharp, and Lennox .
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Flexible availability , including emergencies on evenings and weekends.
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Genuine parts and guaranteed repairs.
AirGreen Tips to Extend the Life of Your Heat Pump
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Check the internal filters regularly (ideally every month during periods of use).
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Clean outdoor units to prevent coil clogging.
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Schedule a full interview in the spring and fall .
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Watch for abnormal noises or variations in performance: these are often a precursor to a more serious problem.
With these simple steps, your HVAC systems will operate at peak performance all year round.
In summary
This Goodman heat pump repair in Outremont is a good example of the wide variety of situations we encounter on a daily basis. Whether it's a refrigerant leak, an electrical issue, or a performance problem, our team has the expertise and equipment to quickly and permanently restore your heating and cooling system .
AirGreen – Your HVAC partner in Montreal, Laval, Longueuil, North Shore and South Shore.
For any request for repair, maintenance or replacement of wall-mounted heat pumps , trust our local know-how and our professional service.