Revival of an LG Mini Split Heat Pump in Laval
Facing a heat pump crisis? Read how AirGreen’s expert repair of an LG mini split in Laval turned a replacement nightmare into a success story of enhanced efficiency and customer delight!
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.
The Challenge: An Apparently Irreparable Mini Split
Context and Initial Assessment
In the heart of Laval, a residential client faced a major challenge with their LG mini split heat pump. Known for its efficiency and reliability, the unit had unfortunately stopped working, leaving the owner helpless in the middle of the season. The client was almost resigned to the idea of an expensive replacement after several unsuccessful repair attempts. That’s when the team of seasoned professionals from AirGreen was called in to take a closer look at the situation.
Upon arrival, our qualified technicians encountered a silent system, without the usual signs of a running compressor’s hum or the gentle whisper of expelled air. The initial diagnosis suggested multiple potential issues, but our team was determined to dig deeper and uncover the true source of the problem.
Discovery and Solution
After a thorough inspection and testing, the AirGreen team identified the culprit: a faulty compressor that had failed due to an electrical overload, worsened by a refrigerant leak that had gone unnoticed during previous inspections. It was a complex scenario requiring not only technical skills but also innovative thinking to resolve effectively.
The repair process involved several key steps:
- Evacuation of existing refrigerant: Safely removing the compromised refrigerant to avoid any environmental impact.
- Compressor replacement: Installing a new high-efficiency LG compressor designed to deliver better performance and greater reliability.
- Sealing and leak testing: Ensuring all connections were secure and the new compressor was free of potential leak points.
- System recharge: Introducing a new batch of refrigerant, precisely measured and optimized for the specific heat pump model.
Calibration and Final Testing
Once the new compressor was in place and the system recharged, our technicians conducted a full series of tests to ensure everything was working as expected. This included checking thermostat settings, verifying temperature differentials in various parts of the home, and ensuring the unit’s noise levels were within normal standards. The system’s response was immediate and promising, with a noticeable improvement in air distribution and temperature control.
Customer Satisfaction and Energy Efficiency
The owner was thrilled with the result. Not only did the repair save them the cost of a full replacement, but the upgraded compressor also delivered an energy efficiency boost, promising reduced energy bills in the future. Our team’s ability to extend the life of the existing system demonstrated our commitment to sustainability and cost-effective solutions for our clients.
Why Choose AirGreen?
Choosing AirGreen for your HVAC needs means more than hiring a simple service provider. It means partnering with a team that brings:
- Expertise: Decades of experience managing all types of HVAC systems.
- Reliability: A commitment to finding the best solution for your unique needs.
- Sustainability: A focus on repairs and solutions that improve energy efficiency and reduce waste.
Whether you are facing a complete system failure or simply seeking preventive maintenance, AirGreen is your go-to expert in Montreal, Laval, Longueuil, and beyond. Our approach to every project is personalized to ensure optimal comfort and efficiency, backed by our satisfaction guarantee.
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.
We look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
Model, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
Floors and furniture protected, wall plate position marked level, wall opening located.
A single opening, with the slope the drain needs to flow outside.
Set on a stand raised above the snow, with the clearances the manufacturer requires.
Connected, insulated and protected. The opening is then sealed against water, cold air and insects.
A dedicated circuit and an accessible disconnect near the outdoor unit.
Leak test, vacuum, then start-up and a check of heating and cooling.
Remote, modes, filters: we show you the essentials before we leave.
- The on-site estimateWe look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
- The quoteModel, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
- Getting readyFloors and furniture protected, wall plate position marked level, wall opening located.
- The wall openingA single opening, with the slope the drain needs to flow outside.
- The outdoor unitSet on a stand raised above the snow, with the clearances the manufacturer requires.
- Lines, cable and drainConnected, insulated and protected. The opening is then sealed against water, cold air and insects.
- The electrical workA dedicated circuit and an accessible disconnect near the outdoor unit.
- Tests and start-upLeak test, vacuum, then start-up and a check of heating and cooling.
- The walkthroughRemote, modes, filters: we show you the essentials before we leave.
What would it look like at your place?
Two quick checks with real numbers: what heat costs, and what your current heaters add up to in BTU/h.
Conversion: 1 W = 3.412 BTU/h. An indication, not a load calculation: baseboards and furnaces are often stronger than the real need, and they can stay as backup. AirGreen confirms the capacity on site.
Four mistakes we do not make
Flip each card to see what we do instead.
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.
Is your home ready?
Check what applies at your place. A "no" is not a refusal: it is what we sort out during the estimate.
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
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?
How cold can it heat?
How much can I save?
How is the LogisVert assistance calculated?
Is it noisy?
The outdoor unit is covered in ice: is that normal?
Does AirGreen hold the required licences?
Is the estimate free?
No question matches. Write to us: we answer.
More jobs to see, near you
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Each dot: a town where AirGreen has published projects. The glowing dot: this job.
Every house has its constraints. We see them before we install.
The on-site estimate is free and the quote follows within 24 hours.
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).