Installation of a MIDEA EVOX G3 3 Ton Central Heat Pump in Laval
Installation in Laval of a 3-ton MIDEA EVOX G3 central heat pump: extreme performance, energy savings, uniform comfort. Ideal HVAC solution for Montreal, North Shore, and South Shore.
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The job on one screen
The unit’s data sheet
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 article, chapter by chapter
A High-Performance Central HVAC Solution Designed for Laval's Climate Realities
At AirGreen, we recently completed a particularly strategic HVAC installation in Laval, involving a MIDEA EVOX G3 3-ton (36,000 BTU) central heat pump. This project perfectly illustrates our approach: rigorous analysis, adaptation to the existing building, and uncompromising technical execution.
The client wanted to replace an old, inefficient central system while improving overall thermal comfort, temperature stability between rooms, and energy consumption. The objective was clear: to obtain a reliable system capable of performing down to -30°C, without excessive reliance on auxiliary heating.
Initial Analysis and Technical Challenges Encountered
Inspection of the Existing System
During our on-site evaluation in Laval, several key elements were identified:
- Aging central system with limited efficiency
- Ductwork still functional but requiring adjustments
- Temperature imbalance between the ground floor and upstairs
- Excessive noise from the outdoor unit
We quickly confirmed that a high-performance central heat pump would be the optimal solution, rather than a simple partial replacement.
Installation Constraints
This project presented certain challenges:
- Restricted mechanical space in the technical room
- Limited access for handling the indoor unit
- Need to optimize existing airflow without complete duct reconstruction
Thanks to our on-site expertise, we opted for a configuration perfectly adapted to the building's structure, while retaining the existing infrastructure.
Why the MIDEA EVOX G3 Was the Ideal Choice
Extreme Heating Performance
The MIDEA EVOX G3 central heat pump stands out for:
- Heating capacity down to -30°C
- High power retention even in severe winter conditions
- Advanced Inverter compressor technology
For a climate like Laval's, this stability is essential. Unlike many standard systems, the EVOX G3 avoids inefficient short cycles and maintains a constant temperature.
Energy Efficiency and Tangible Savings
Here are the key performances of this model:
- SEER2: 17.7
- HSPF2: 10.0
- EER2: 12.0
- ENERGY STAR® (cold climate) certification
Result: a significant reduction in electricity costs, particularly during prolonged heating periods.
In this specific project in Laval, the client observed from the first few weeks:
- Improved thermal stability
- Reduced reliance on auxiliary heating
- More predictable consumption
Eco-friendly R-454B Refrigerant
An increasingly important point for our customers:
- Low environmental impact R-454B refrigerant
- Significantly reduced GWP (global warming potential)
- Compliance with modern environmental standards
This installation is thus part of a sustainable approach, without compromising performance.
AirGreen Installation Process: Precision and Rigor
Key Steps Performed
Our team followed a strict protocol:
-
Site Preparation
- Duct verification
- Cleaning and adjustment of air passages
-
Indoor Unit Installation
- Model: MAUSE-H36B-2A
- Perfect adaptation in the restricted space
-
Outdoor Unit Installation
- Model: MO1SE-H36B-2A
- Strategic positioning to limit noise and optimize efficiency
-
Refrigerant Connections
- Tubing: 3/8 – 3/4
- Complete pressure test
- Vacuum pull (rigorous micron test)
-
Commissioning and Calibration
- Airflow verification
- System adjustment Computational Constant Airflow 2.0
Final Result
- Homogeneous air distribution throughout the house
- Reduced noise level (31.5 to 49.5 dB indoors)
- Perfectly balanced system
The client immediately noticed a marked difference in comfort and quietness.
Smart Technology and Advanced Control
Integrated WiFi and Remote Management
The MIDEA EVOX G3 includes:
- Control via mobile app
- Scheduling of time slots
- Energy consumption monitoring
This allows for proactive comfort management, even remotely.
Sub-1 GHz Wireless Communication
Unlike traditional systems:
- Less complex wiring
- More flexible installation
- Increased reliability in communication between units
Available Grant: A Major Advantage
For this installation in Laval, the client benefited from:
- LogisVert Grant: up to $3720
At AirGreen, we systematically assist our clients:
- Eligibility validation
- Complete documentation
- Assistance with procedures
Common Mistakes Avoided in This Project
We often observe errors in similar installations:
- Incorrect system sizing
- Neglect of the ductwork system
- Installation without adequate micron testing
- Inadequate positioning of the outdoor unit
In this specific case, our rigorous approach allowed us to avoid all these pitfalls.
Client Feedback After Installation
A few weeks after commissioning:
- Stable temperature in all rooms
- Improved comfort, particularly upstairs
- Noticeable reduction in outdoor noise
- Simplified use thanks to WiFi
This type of feedback is consistent for this model, particularly in the Laval and North Shore regions.
Why Trust AirGreen for Your HVAC Installation
We distinguish ourselves by:
- Proven field expertise in central heat pumps
- Clean, precise, and durable installation
- Total transparency in our recommendations
- Fast and efficient after-sales service
Each project is treated as unique, with a solution adapted to the reality of the building.
Conclusion: A Strategic Choice for Comfort and Efficiency
This MIDEA EVOX G3 central heat pump installation in Laval demonstrates that a well-chosen and correctly installed system completely transforms indoor comfort.
Between performance at -30°C, energy efficiency, smart control, and available grants, this model represents a solid solution for homeowners in:
- Montreal
- Laval
- Longueuil
- North Shore
- South Shore
At AirGreen, we continue to implement this type of solution with a single objective: to offer durable, reliable comfort adapted to Quebec's realities.
The job tools
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.
How the job unfolds
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 we check on a job like this one
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.
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.
Good habits, once the unit is in place
Six simple habits that keep the unit going. Your list stays on this device.
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.
The right pages, at the right time
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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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).