A loss of performance in the summer heat
We received a call from a customer in Sainte-Julie , concerned that his Fujitsu wall-mounted heat pump was no longer adequately cooling his living room. The indoor temperature remained high despite being set to 20°C, and the unit was blowing lukewarm air. This is a common scenario at the beginning of summer, often linked to a failure of the refrigeration circuit or a lack of maintenance.
At AirGreen , we know that a poorly maintained HVAC system can quickly lose energy efficiency. So we dispatched our team to perform a complete and rapid on-site diagnosis .
Initial diagnosis: precision above all
Upon arrival, our technicians noticed that the Fujitsu indoor unit was operating continuously without reaching the desired temperature. An infrared thermometer measured a blown air temperature of 9.4°C —a seemingly acceptable value, but insufficient given the ambient temperature and humidity levels in the room.
The first checks focused on:
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Air filters , partially clogged with dust.
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The internal exchanger was slightly dirty, which reduced heat transfer.
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The outdoor condenser , clean but with a fan slightly slowed down by a weakened capacitor.
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Refrigerant pressures , slightly lower than normal — a sign of a microleak in the circuit .
Technical intervention: efficiency and precision
Our technicians undertook a complete intervention according to the AirGreen protocol:
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Cleaning the indoor coil using a non-corrosive biodegradable solution, restoring optimal airflow.
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Replaced the outdoor fan start capacitor to restore full rotation speed.
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Tracer gas leak detection : this came from a slightly loose fitting on the liquid line.
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Tightening, welding and complete vacuuming of the system before precise recharging with R-410A refrigerant .
Once the repairs were made, a new infrared thermometer test showed a blowing at 5.6°C , a significant improvement in efficiency and a return to nominal performance.
Result: comfort restored and efficiency regained
The difference in comfort was immediately noticeable. In less than twenty minutes, the interior temperature of the home had dropped by 3°C. The client, impressed by the speed and accuracy of our diagnosis, found a constant, quiet coolness in his main room.
Our technicians also took the time to explain best practices for extending the life of your heat pump:
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Clean the filters once a month during the summer season.
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Check clearances around the outdoor unit to avoid overheating.
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Schedule annual preventative maintenance , including deep cleaning and refrigerant gas checks.
AirGreen: Your trusted partner for HVAC repairs in Sainte-Julie and throughout Greater Montreal
Every intervention we carry out reflects our commitment to quality, rigor and transparency . Our certified teams handle all brands of heat pumps— Fujitsu, Sharp, Midea, Gree, Goodman, Lennox and Trane , among others—with the same attention to detail.
We know that a simple pressure difference or minor leak can compromise an entire HVAC system. That's why we use advanced diagnostic tools , like infrared thermometers, electronic leak detectors, and calibrated recovery stations, to ensure lasting results.
Whether you are in Montreal , Laval , Longueuil , on the North Shore or the South Shore , AirGreen intervenes quickly to restore the thermal comfort and energy performance of your home.
Details of the intervention
| Element | Description |
|---|---|
| Type of equipment | Wall-mounted heat pump |
| Brand | Fujitsu |
| Place | Sainte-Julie (South Shore) |
| Reported problem | Warm air, loss of efficiency in air conditioning mode |
| Diagnosis | Microleak + defective capacitor |
| Work carried out | Cleaning, soldering, capacitor replacement, R-410A recharge |
| Final result | Blowing at 5.6°C, comfort restored |
| Recommended prevention | Annual maintenance and regular cleaning of filters |
Conclusion
This Fujitsu wall-mounted heat pump repair in Sainte-Julie perfectly illustrates the AirGreen method: a rigorous approach based on measurement, precision and durability .
By restoring system efficiency, we not only restored comfort to the customer, but also extended the useful life of their equipment—while ensuring better energy efficiency.
At AirGreen , we believe that a well-done HVAC service means a reliable, quiet and efficient system, year after year.