Installation of a MIDEA EVOX G3 3-ton central heat pump in Laval-des-Rapides
AirGreen installs a MIDEA EVOX G3 3-ton central heat pump in Laval-des-Rapides: heating down to -30°C, R-454B, WiFi included, LogisVert subsidy, and lasting central comfort.
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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 Central System Designed for the Real Comfort of a Laval Home
In Laval-des-Rapides, we recently installed a MIDEA EVOX G3 3-ton central heat pump for an owner who wanted to replace an older system that was less efficient, noisier, and less stable during the typical temperature fluctuations of the Laval region. The objective was clear: to obtain a central heating and central air conditioning system capable of serving the entire home with uniform temperature, good energy efficiency, and solid reliability in winter.
The choice fell on the MIDEA EVOX G3, outdoor model MO1SE-H36B-2A, paired with the indoor unit MAUSE-H36B-2A. This central heat pump offers a cooling capacity of 36,000 BTUs, or 3 tons, with heating performance designed to operate down to -30 °C. For a residence located in Laval-des-Rapides, where winters can be humid, windy, and demanding, this feature was decisive.
A Neatly Installed Outdoor Unit on a Wall Mount
The project photo clearly illustrates one of the important elements of this installation: the outdoor unit was placed on a solid wall mount, above ground level, to protect it from snow accumulation, debris, stagnant water, and possible impacts during outdoor property maintenance.
This configuration is particularly relevant in Laval, where many houses have narrow side margins, exposed foundations, and circulation areas around the building. In this specific case, our technicians chose a location that allowed for:
- good air circulation around the outdoor unit;
- reasonable access for future maintenance;
- a safe distance from windows and openings;
- discreet visual integration along the exterior wall;
- a stable installation despite the unit's natural weight and vibrations.
The MIDEA EVOX G3 has an outdoor sound level of 62.5 dB(A). The unit's location was therefore carefully chosen to preserve occupant comfort and limit noise disturbances near resting areas.
Technical Specifications for this Project
For this installation in Laval-des-Rapides, the technical specifications of the MIDEA EVOX G3 3-ton central heat pump represented an excellent balance of performance, efficiency, and durability.
Key data for the installed system:
- Brand: Midea
- Model: MIDEA EVOX G3
- Type: Central heat pump
- Capacity: 3 tons
- Cooling: 36,000 BTU
- Heating: Operates down to -30 °C
- SEER2: 17.7
- HSPF2: 10.0
- EER2: 12.0
- ENERGY STAR: yes
- ENERGY STAR Cold Climate: yes
- Refrigerant: R-454B
- Voltage: 220 V
- Piping: 3/8 – 3/4
- WiFi: Included
- AHRI: 215471343
- Warranty: 12 years compressor, 12 years parts, 10 years labor
- Provincial LogisVert Subsidy: $3,720 based on available information for this model
This level of performance makes the machine very attractive for owners who wish to modernize their HVAC system without sacrificing winter comfort. Unlike many older systems, this heat pump's Inverter technology allows for more precise modulation, which helps reduce sudden cycles, temperature fluctuations, and consumption peaks.
Why a Central Heat Pump was the Right Choice in Laval-des-Rapides
In this project, the client was not just looking to add an air conditioning unit. They wanted a complete solution capable of managing the comfort of the entire home, both in summer and winter. A wall-mounted heat pump might have been suitable for a specific area, but the property's configuration clearly favored a central heat pump connected to the existing duct network.
This choice allows air to be distributed to multiple rooms from a single system. For a family home, this is often the most comfortable solution when the ducts are in good condition or can be adapted. Our technicians therefore assessed the duct capacity, return air, static pressure, available space for the indoor unit, and the feasibility of refrigerant passage between the interior and exterior.
In Laval-des-Rapides, many residences built during different renovation cycles present similar challenges: finished basements, finished exterior walls, limited mechanical access, concrete foundations, and sometimes an old central unit installed in a confined space. Our role then is to adapt the installation to the building, rather than forcing a generic solution.
Challenges Encountered During Installation
Installing a MIDEA EVOX G3 central heat pump requires more than just a simple connection. In this project, several technical points required special attention.
Stability of the Outdoor Mount
The outdoor unit had to be securely anchored to the wall, while respecting the foundation structure and exterior cladding. Our technicians installed a robust, level mount adapted to the unit's weight. The positioning was checked to avoid any tilt that could affect drainage, vibrations, or long-term wear.
Routing of Refrigerant Lines
The 3/8 – 3/4 piping requires careful planning, especially when the house's exterior appearance needs to be preserved. We ensured that the lines were well protected, well insulated, and installed with a clean finish. Poor management of refrigerant lines can lead to performance losses, vibrations, or a neglected appearance. At AirGreen, this detail is part of our HVAC installation standard.
Airflow Verification
A high-performing central heat pump will not deliver its full potential if the airflow is poorly balanced. Before commissioning, we paid particular attention to duct circulation, return air, and indoor unit operation. The announced indoor sound level, 31.5 / 49.5 dB(A), strongly depends on a well-adjusted installation and adequate air distribution.
Complete Commissioning
Commissioning includes electrical checks, refrigeration control, system startup, heating and cooling tests, and explaining the operation to the client. We also validated the included WiFi connectivity, so the owner can manage their comfort more easily.
A Machine Designed for Quebec Winters
The main advantage of the MIDEA EVOX G3 3-ton is its ability to sustain heating during severe cold. With an operating range down to -30 °C and ENERGY STAR Cold Climate certification, it meets the needs of homeowners in Montreal, Laval, Longueuil, the North Shore, and the South Shore.
In an area like Laval-des-Rapides, where homes can experience rapid variations between humid days, cold winds, and thaws, a central heat pump must be able to adjust without making comfort unstable. Inverter technology helps modulate power according to actual demand, rather than operating only with more abrupt on-off cycles.
The Importance of R-454B Refrigerant
The installed model uses R-454B refrigerant, a significant evolution in residential HVAC. This refrigerant is designed to reduce environmental impact compared to many older fluids. For owners who wish to modernize their system while considering new market standards, this is a concrete argument.
Installing an R-454B system also requires good technical expertise. Connection, testing, evacuation, and commissioning procedures must be carried out rigorously. An approximate installation can compromise the performance of an otherwise very well-designed appliance.
What the Client Noticed After Installation
From the first tests, the owner noticed a significant difference in temperature stability. The central system distributed air more regularly than the old equipment. The comfort was less aggressive, more constant, with fewer variations between rooms.
The most appreciated points:
- better temperature uniformity;
- quieter operation;
- more stable heating response;
- more comfortable air conditioning during hot days;
- simplified management with included WiFi;
- a general impression of a more modern and reliable system.
For a family residence in Laval-des-Rapides, this type of result is exactly what we aim for: comfort that is felt without the client constantly needing to adjust their thermostat.
Mistakes to Avoid with a Central Heat Pump
A high-performing central heat pump is never just about the brand or model. Installation is just as important as the machine itself. Here are the mistakes we see too often in the field.
Choosing Capacity Without Building Analysis
Installing a 3-ton machine without checking the area, insulation, ducts, and actual needs can cause comfort problems. Too high a capacity can lead to short cycles. Too low a capacity can force the system to work constantly. In this project, the 36,000 BTU capacity matched the house's needs well.
Neglecting the Ductwork
The ductwork must allow for adequate airflow. Even an excellent heat pump will yield average results if the ducts are undersized, obstructed, or unbalanced. That's why our evaluation is never limited to the outdoor unit.
Installing the Outdoor Unit Too Close to the Ground
In Quebec, an outdoor unit installed too low can become partially blocked by snow. The wall mount visible in this installation protects the unit and facilitates clearance around the heat pump.
Forgetting Maintenance
Proper HVAC maintenance extends the system's lifespan, maintains energy efficiency, and reduces the risk of breakdowns. Filters, coils, drains, electrical connections, and operating parameters must be checked periodically.
Our AirGreen Method for a Successful Central Installation
At AirGreen, we follow a structured method for every central heat pump installation in Laval, Montreal, Longueuil, on the North Shore, and on the South Shore.
Our approach includes:
-
On-site Evaluation
We analyze the house, the old system, ducts, mechanical location, and client expectations. -
Choosing the Right Model
We don't recommend a machine just because it's available. We choose it based on the building, desired performance, potential subsidy, and budget. -
Installation Planning
We prepare for line routing, outdoor positioning, mechanical protection, electrical connections, and maintenance access. -
Clean and Durable Installation
Our refrigeration technicians pay great attention to finishing, leveling, insulation, evacuation, and operational tests. -
Client explanation
Once the unit is installed, we take the time to explain the settings, Wi-Fi usage, basic maintenance, and seasonal best practices.
An installation adapted to Laval, but relevant for the entire greater region
Even if this project was carried out in Laval-des-Rapides, the same issues are found in several areas: single-family homes in Montreal, bungalows in Longueuil, residences on the North Shore, family properties on the South Shore. The MIDEA EVOX G3 is particularly interesting when the client is looking for a robust, subsidy-eligible central system capable of facing Quebec winters.
The LogisVert subsidy announced for this model, which is $3,720, also represents a significant factor in the decision. For many homeowners, this financial assistance can make the transition to a new generation central heat pump much more accessible.
A project that shows the importance of a well-thought-out installation
This installation of a 3-ton MIDEA EVOX G3 central heat pump in Laval-des-Rapides demonstrates that a good result depends on a set of precise decisions: the right model, the right location, the right support, the right connection, the right airflow, and a complete commissioning.
For the homeowner, the result is a quieter, more stable central system better adapted to Quebec's climatic realities. For us at AirGreen, it is another concrete example of our commitment to sustainable, clean, and truly adapted HVAC installations for each home.
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).