Installation of a MIDEA EVOX G3 3-ton central heat pump in Lachine
HVAC installation in Lachine of a 3-ton MIDEA EVOX G3 central heat pump. Increased comfort, energy savings, and guaranteed performance for Montreal and its surroundings.
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.
It captures or rejects heat outside. It sits on a level base, above the snow, with free space all around.
The insulated refrigerant lines enter the house through a sealed opening and run to the indoor coil.
A shut-off switch near the outdoor unit isolates it safely for service.
Sitting on the indoor module, it moves heat between the house air and the refrigerant.
Electric furnace or air handler: its fan pushes air through the ducts. The electric backup takes over in extreme cold.
Supply ducts bring air to the rooms; returns bring it back to the unit. Their condition matters as much as the unit's.
It protects the coil and the fan. A dirty filter cuts airflow, so it gets checked regularly.
It runs the heat pump and the backup heat. It must be compatible with the installed system.
A complete HVAC transformation for optimal comfort in Lachine
At AirGreen, every HVAC installation project is an opportunity to demonstrate our technical rigor and deep understanding of Quebec's climatic realities. This intervention carried out in Lachine, in western Montreal, perfectly illustrates our approach: thoroughly analyze, intelligently recommend, and precisely execute.
The mandate was to replace an old, inefficient central system with a MIDEA EVOX G3 3 ton central heat pump , known for its reliability in cold climates and excellent energy efficiency. The client was looking for a solution capable of maintaining a stable temperature in winter while reducing their energy costs.
A residential project with real constraints
Initial assessment and technical challenges
From the first site visit, several challenges were identified:
- An old, inefficient central system
- Limited outdoor space for unit installation
- Uneven airflow in certain areas of the house
- A clear client request: improve comfort without major renovations
We quickly determined that the MIDEA EVOX G3 central heat pump was an ideal solution due to its adaptability to existing systems.
Why this specific model?
The MIDEA EVOX G3 3 tons (36,000 BTU) stood out for several technical reasons:
- Heating capacity down to -30°C, essential for Montreal and the South Shore
- ENERGY STAR® (cold climate) certification
- High efficiency: SEER2 17.7 | HSPF2 10.0 | EER2 12.0
- Eco-friendly refrigerant R-454B
- Inverter technology for intelligent modulation
- Controlled sound level: 62.5 dB(A) outdoor
In addition, the LogisVert grant, which can reach $3720, reinforced the relevance of the choice for the client.
Installation process in Lachine
Outdoor unit installation: precision and durability
The project image clearly shows the installation of the outdoor unit on a solid wall bracket, slightly elevated to:
- Avoid snow accumulation in winter
- Reduce vibrations transmitted to the structure
- Facilitate future maintenance
We took care to:
- Ensure perfect alignment of the unit
- Install mechanical protection for refrigerant lines
- Optimize line routing for a clean aesthetic
Line and drainage management
A critical point in this project was line management:
- 3/8 – 3/4 piping properly insulated
- Sealed and secure wall penetration
- Condensate drainage effectively directed away from foundations
We also performed a complete vacuum pull (micron test) to ensure system integrity and eliminate any moisture in the lines — an essential step often overlooked elsewhere.
Integration with the existing central system
Adaptation without compromise
One of the great advantages of the MIDEA EVOX G3 is its ability to integrate with an existing duct system. In this specific case:
- No major duct replacement was necessary
- Airflow adjustment via Computational Constant Airflow 2.0
- System calibration for uniform distribution
Result: immediate comfort improvement without invasive work.
Airflow optimization
We made several adjustments:
- Register balancing
- Pressure drop verification
- Circulation test in each room
These steps help avoid common errors such as:
- Overheated rooms
- Persistent cold spots
- Unnecessary energy consumption
Observed real-world performance after installation
Improved thermal comfort
From the first days, the client noted:
- Softer, more constant heat
- Elimination of temperature variations
- Better humidity control
Unlike some traditional systems, the central heat pump offers progressive and homogeneous heating.
Reduced energy consumption
Thanks to Inverter technology:
- The compressor adjusts its speed in real-time
- Fewer energy-intensive ON/OFF cycles
- Significant reduction in electricity bills
In this project in Lachine, initial estimates indicate a significant drop in heating costs.
What sets an AirGreen installation apart
A rigorous methodology
Every HVAC installation we perform follows a strict process:
- Complete thermal analysis
- Selection of the appropriate model
- Precise installation compliant with RBQ standards
- Complete tests (pressure, micron, operation)
- Detailed explanation to the client
Details that make a difference
On this project, several elements illustrate our attention to detail:
- Secure fastening of the outdoor unit
- Aesthetic management of cables and conduits
- Weather protection
- Post-installation acoustic verification
These aspects guarantee not only performance but also durability.
Practical advice for homeowners
Choosing the right capacity
A common mistake is oversizing or undersizing the system. For this project:
- 3 tons (36,000 BTU) perfectly suited to the area
- Analysis based on insulation, exposure, and structure
Do not neglect installation
Even the best heat pump can underperform if poorly installed. It is essential to:
- Check the installer's certifications
- Ensure a real micron test
- Demand a complete, not approximate, installation
Think long-term
With:
- 12-12-10 (compressor, parts, labor) warranty
- Available subsidies
- Energy savings
The MIDEA EVOX G3 represents a strategic investment for homeowners in Montreal, Laval, Longueuil, North Shore, and South Shore.
Client feedback
The homeowner in Lachine shared their experience with us:
- Fast and clean installation
- Clear explanations of operation
- Immediate comfort after commissioning
His primary goal — improving winter heating — was fully achieved, while also benefiting from a modern and connected system (WiFi included).
Conclusion: a modern HVAC solution perfectly adapted to Quebec
This MIDEA EVOX G3 central heat pump installation in Lachine demonstrates that it is possible to transform an existing system into a high-performance, economical, and sustainable solution.
At AirGreen, we combine technical expertise, local knowledge, and rigorous execution to deliver tangible results. Whether in Montreal, Laval, Longueuil, on the North Shore, or the South Shore, our goal remains the same: to provide a reliable, efficient, and perfectly adapted HVAC installation for every home.
The unit on this job, in figures
The range as published on airgreen.ca: pick a size to see its capacity in deep cold.
| Size | Heating at −8 °C | Heating at −15 °C | Coldest certified point | COP at −15 °C | SEER | HSPF | Indicative LogisVert aid |
|---|---|---|---|---|---|---|---|
| Midea EVOX G3 · 1.5 tons | 14,700 | 18,600 | −30 °C: 11,800 | 2.12 | 19.0 | 10.1 | $1,764 |
| Midea EVOX G3 · 2 tons | 20,800 | 20,600 | −30 °C: 12,100 | 2.14 | 18.6 | 10.0 | $2,496 |
| Midea EVOX G3 · 2.5 tons | 24,000 | 33,200 | −30 °C: 17,900 | 1.97 | 17.2 | 10.8 | $2,880 |
| Midea EVOX G3 · 3 tons | 33,000 | 37,400 | −30 °C: 27,600 | 1.9 | 18.0 | 10.0 | $3,960 |
| Midea EVOX G3 · 4 tons | 39,500 | 48,000 | −30 °C: 27,200 | 2.0 | 17.5 | 9.5 | $4,740 |
| Midea EVOX G3 · 5 tons | 45,000 | 54,000 | −30 °C: 37,300 | 1.9 | 17.5 | 9.5 | $5,400 |
Data read live from the airgreen.ca page of each size (NEEP / AHRI certified performance). When the title names the installed size, it is highlighted; otherwise the whole range is shown. The aid shown is today’s, using Hydro-Québec’s rule ($120 per 1,000 BTU/h at −8 °C); amounts quoted in the article date from its publication. Only Hydro-Québec confirms the assistance granted.
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 ducts, the current indoor module, the electrical panel and the planned spot for the outdoor unit.
The equipment combination, capacity and price, in writing. We check whether the combination qualifies for assistance programs.
Access protected, old unit disconnected and removed when it is being replaced.
Electric furnace or air handler, with its coil, connected to the supply and return ducts.
On a level base, raised above the snow, with free space all around.
Insulated, they enter through a sealed opening and run to the indoor coil.
Dedicated circuits, accessible disconnect, a thermostat that works with the heat pump and the backup heat.
Leak test, vacuum, start-up, airflow check and a test of both modes.
Filter, thermostat, backup heat in extreme cold: what to know before winter.
- The on-site estimateWe look at the ducts, the current indoor module, the electrical panel and the planned spot for the outdoor unit.
- The quoteThe equipment combination, capacity and price, in writing. We check whether the combination qualifies for assistance programs.
- Getting readyAccess protected, old unit disconnected and removed when it is being replaced.
- The indoor moduleElectric furnace or air handler, with its coil, connected to the supply and return ducts.
- The outdoor unitOn a level base, raised above the snow, with free space all around.
- The refrigerant linesInsulated, they enter through a sealed opening and run to the indoor coil.
- Electrical and thermostatDedicated circuits, accessible disconnect, a thermostat that works with the heat pump and the backup heat.
- Tests and start-upLeak test, vacuum, start-up, airflow check and a test of both modes.
- The walkthroughFilter, thermostat, backup heat in extreme cold: what to know before winter.
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.
Baseboards and electric furnaces turn 1 kWh of electricity into 1 kWh of heat. A heat pump delivers more: that is its COP. At Hydro-Québec’s rate D (11.142¢/kWh above 40 kWh a day, since 1 April 2026):
Hydro-Québec: a heat pump can be up to three times more efficient than baseboards for heating in the colder months.
Estimate per kWh of heat, at the chosen temperature, using the certified COP from the product page. Taxes, access charge and backup heat not included.
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.
- Check the indoor module's filter.
- Clear winter debris from the outdoor unit.
- Test cooling before the heat arrives.
- Check the filter more often in peak season.
- Keep registers and returns clear.
- Watch condensate drainage near the coil.
- Change or clean the filter.
- Test heating and backup heat before the cold.
- Book periodic maintenance.
- Clear snow around the outdoor unit.
- Store nothing in front of the indoor module.
- Note any unusual noise or smell and call us.
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. A central heat pump uses the house's ducts.
It connects to the existing ducts to heat and cool everywhere.
2. In extreme cold, electric backup heat can take over.
The indoor module (furnace or air handler) works with the heat pump and takes over in extreme cold.
3. The filter only gets changed when the unit breaks down.
A dirty filter cuts airflow. It gets checked regularly.
4. You can reuse the old unit's size without checking.
The house may have changed: insulation, windows, added rooms. Capacity is confirmed on site.
0 / 4 right answers
What people ask us about this kind of work
Can I keep my current ducts?
What happens in extreme cold?
Furnace, air handler, ducted: what is the difference?
Are there grants?
Do I need a permit?
How much can I save?
How is the LogisVert assistance calculated?
Will my current thermostat work?
Central or wall units: which one?
Does AirGreen hold the required licences?
Is the estimate free?
No question matches. Write to us: we answer.
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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).