Repair of a Mitsubishi Mini Split Heat Pump in Longueuil
See how AirGreen revived an old Mitsubishi mini split in Longueuil, saving our customer time and money with a thorough repair and maintenance service.
Take a tour of the installation
Each number is a point we check on site. Switch between summer and winter to watch air and heat move.
In summer, the outdoor unit rejects the house's heat outside.
Generic illustration of this type of installation, not a survey of this job site. Tap a number.
Mounted level on a wall plate, high enough for the air to reach the whole room, with enough space around it to slide the filters out easily.
The refrigerant lines, the communication cable and the drain go through the wall in a single opening, sealed against water, cold air and insects.
Two insulated copper pipes connect the two units. Outside, a line cover can protect them from sun, knocks and weather.
A shut-off switch near the outdoor unit isolates it safely for service. It must stay accessible at all times.
The compressor and the fan. In heating mode it captures heat from the outdoor air, even in winter, and moves it inside.
On the ground or on the wall, it keeps the unit above accumulated snow. The unit stays clear and defrost water can drain away.
The fan needs to blow freely. Storage, a fence or a wall too close, and efficiency drops while noise goes up.
Mitsubishi Mini Split Heat Pump Repair in Longueuil: Extending the Life of a Trusted System
When Experience Meets Expertise: Our Journey in Restoring This Mitsubishi Mini Split
At AirGreen, we understand the importance of a well-functioning HVAC system. Whether it’s the scorching summer heat or the biting cold of winter, a reliable heat pump can make all the difference in comfort. So, when we received a call from a loyal customer in Longueuil about an issue with their Mitsubishi mini split, we knew we had to bring our A-game. This wasn’t just any repair job; it was a chance to breathe new life into a trusted machine that had served its family well over the years.
Diagnosing the Issue: A Deep Dive into the Mitsubishi’s Condition
Upon arriving on-site, we were greeted by the sight of a Mitsubishi mini split unit that had clearly seen better days. Installed years ago, this machine had withstood countless seasons, providing reliable heating and cooling through the ups and downs of Montreal’s unpredictable weather. The customer explained that they’d noticed the unit wasn’t cooling as efficiently and that the airflow had decreased significantly.
Our technicians conducted a thorough inspection to pinpoint the exact issues. We found signs of wear and tear on some internal components, dust accumulation affecting the airflow, and a few potential leaks that could be impacting the machine’s performance. The customer, understandably concerned, was weighing the option of replacing the unit altogether. But given the quality of Mitsubishi products and our confidence in our repair abilities, we assured them that we could restore their heat pump to peak performance without the need for a costly replacement.
Step-by-Step Repair Process: The AirGreen Way
Repairing an aging mini split like this requires careful attention to detail. Here’s how we approached it:
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Deep Cleaning of Internal and External Components
- One of the primary reasons for the declining efficiency was dust and grime buildup. Our technicians performed a comprehensive cleaning, removing years of accumulated debris from both the indoor and outdoor units. This step is crucial in any HVAC maintenance, as it helps improve airflow, energy efficiency, and overall performance.
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Checking and Fixing Leaks
- During our inspection, we identified a small refrigerant leak. Refrigerant is essential for the cooling process, and even a minor leak can severely impact efficiency. We sealed the leak, tested the system for any further issues, and recharged the refrigerant to the appropriate level. This restored the cooling capability of the unit and ensured it would continue to operate smoothly.
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Component Testing and Replacement
- Some of the internal parts, particularly the fan motor and capacitor, showed signs of wear. We replaced these components to prevent future breakdowns. Mitsubishi mini splits are known for their longevity, and by swapping out these parts, we could significantly extend the life of the unit.
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Fine-Tuning and System Calibration
- After replacing and repairing the necessary components, we calibrated the system to optimize its performance. This involves adjusting settings to ensure the heat pump runs at maximum efficiency. A fine-tuned system not only saves energy but also maintains a consistent indoor temperature, providing superior comfort.
Happy Customer, Reliable System: The Satisfaction of Restoring an Old Friend
After completing the repairs, we tested the system extensively to confirm that everything was running as it should. The difference was immediately noticeable. The Mitsubishi mini split was back to delivering powerful, consistent airflow, and the customer could once again enjoy a comfortable home environment. They were thrilled with the results, not only because of the cost savings compared to a new unit but also because they had a sentimental attachment to the machine that had served them for so many years.
Why Choose Repair Over Replacement?
Opting for repair instead of replacement can be a smart choice, especially for high-quality brands like Mitsubishi. Here are some reasons why it made sense in this case:
- Cost-Effectiveness: Repairs are often significantly cheaper than a full replacement, especially when the unit still has a solid structure and only needs minor component changes.
- Sustainability: By extending the life of an existing unit, we reduce waste and promote sustainability.
- Familiar Performance: Our customer already knew and trusted the performance of their Mitsubishi heat pump, and a repair allowed them to retain that familiarity without the need to adjust to a new system.
Prolonging the Life of HVAC Systems: Tips from AirGreen
While we love being the ones to bring your systems back to life, there are ways you can help prolong the life of your HVAC equipment. Here are a few maintenance tips to keep in mind:
- Regular Cleaning: Keep the area around the outdoor unit clear of debris and foliage. Dust and dirt buildup can affect airflow, leading to reduced efficiency.
- Seasonal Maintenance: Have a professional service your system at least once a year, ideally before the peak heating or cooling season. This helps catch small issues before they become big problems.
- Monitor for Changes: If you notice a drop in performance, strange noises, or unusual smells, call a professional. Early intervention can prevent costly repairs down the line.
Our Commitment to Quality and Customer Satisfaction
At AirGreen, we don’t just fix machines; we restore comfort. Our team of certified technicians takes pride in every repair, knowing that our work directly impacts our customers' quality of life. This project in Longueuil was no different. The satisfaction on our customer’s face as they felt the renewed power of their Mitsubishi heat pump was a reminder of why we do what we do.
Mitsubishi Mini Splits: Built to Last with the Right Care
Mitsubishi is a trusted name in the HVAC industry, and their mini split heat pumps are renowned for reliability and efficiency. With proper care and occasional repairs, these systems can operate effectively for years beyond the average lifespan of other brands. Our work on this repair project reaffirmed our belief in Mitsubishi’s quality and resilience.
Contact AirGreen for Reliable HVAC Repair in Montreal, Laval, Longueuil, and Beyond
If you have an aging HVAC system and are wondering whether it’s time to replace it, consider giving us a call first. Our experienced team will assess your unit honestly and help you make the best decision for your comfort and budget. At AirGreen, we’re committed to delivering high-quality service and building long-term relationships with our clients.
From heat pump repairs to full system installations, we bring our best to every project. Contact us today to learn how we can help you stay comfortable year-round.
The big day, step by step
The main steps of this kind of job at AirGreen. Every house has its quirks: the estimate brings them out.
The symptoms, since when, the model (on the unit's label) and the error code if there is one.
We look for the cause, not just the symptom: readings, components, installation.
Repair, part to order or replacement, depending on the failure. We explain what we found.
The repair is done and parts replaced as needed.
The unit is restarted and checked in its operating modes.
What caused the failure and what can keep it from coming back.
- Your callThe symptoms, since when, the model (on the unit's label) and the error code if there is one.
- On-site diagnosisWe look for the cause, not just the symptom: readings, components, installation.
- The optionsRepair, part to order or replacement, depending on the failure. We explain what we found.
- The workThe repair is done and parts replaced as needed.
- TestsThe unit is restarted and checked in its operating modes.
- AdviceWhat caused the failure and what can keep it from coming back.
Your own project, step by step
What to do, season by season
Three habits per season for this unit. They take a few minutes and prevent many calls.
- Clean the indoor unit's filters.
- Clear leaves and debris left on the outdoor unit by winter.
- Test cooling before the first hot days.
- Clean the filters more often when the unit runs a lot.
- Keep plants away from the outdoor unit.
- Check that no water drips from the indoor unit.
- Rake the leaves around the outdoor unit.
- Test heating before the first cold days.
- Book periodic maintenance before winter.
- Keep snow away from the stand and the front of the unit.
- Let the unit defrost: it is normal.
- Never hit the ice on the fins; call us if the unit stays iced up.
Four statements: true or false?
It all comes down to details you have just seen.
1. In heating mode, the outdoor unit can produce water.
During defrost cycles. That water must drain away without forming ice.
2. You pick the capacity with a simple square-footage rule.
Windows, insulation, orientation and how the room is used all count. Capacity is chosen on site.
3. A multi-zone connects several indoor heads to a single condenser.
One head per room, all on the same condenser. Each room keeps its own temperature.
4. The disconnect can sit behind the patio furniture.
It must stay accessible: it is what shuts the unit off for service.
0 / 4 right answers
What people ask us about this kind of work
What should I have ready before calling?
Repair or replace?
Does a wall-mounted heat pump heat in winter?
Wall-mounted or multi-zone: how do I choose?
Where does the outdoor unit go?
Are there grants?
Do I need a permit?
Does AirGreen hold the required licences?
Is the estimate free?
No question matches. Write to us: we answer.
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Text and photo: a real AirGreen Climatisation & Chauffage job. The diagrams are generic illustrations of the type of installation, not a survey of this job site. Sources of the added figures: airgreen.ca product pages (NEEP / AHRI performance), Hydro-Québec (Heat pumps page, LogisVert, read on 13 October 2026), Régie de l’énergie (rate D as of 1 April 2026).