Installation of a 2.5-ton MIDEA EVOX G3 central heat pump in Longueuil: a robust and refined HVAC solution for a brick house
In Longueuil, AirGreen installs a 2.5-ton MIDEA EVOX G3 central heat pump on wall brackets, with clean connection, optimal clearance, and performance adapted to Quebec's climate.
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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 installation in Longueuil where positioning precision changes everything
This installation of a MIDEA EVOX G3 2.5 ton central heat pump in Longueuil perfectly illustrates the importance of well-planned HVAC work even before the equipment arrives on site. In the photo, the outdoor unit is installed on a brick wall, solidly mounted on metal supports anchored in the foundation. The result is clean, stable, and adapted to the realities of a residential property on the South Shore, where every foot of outdoor space counts.
In this project, our AirGreen team had to integrate a high-performance central heat pump into an environment already occupied by several technical elements: existing outdoor wiring, a high wall outlet, a nearby electrical disconnect panel, brick siding, exposed foundation, and limited vertical clearance due to the building's configuration. These details may seem secondary at first glance, but they directly influence the quality of the installation, accessibility for HVAC maintenance, the unit's durability, and seasonal performance.
The MIDEA EVOX G3 2.5 ton is a central system with a nominal capacity corresponding to approximately 30,000 BTU, a very common size for many medium-sized single-family homes when the heat load calculation confirms that this capacity is appropriate. AirGreen presents this model with a cooling capacity of 30,000 BTU, heating operation down to approximately -30°C, and advertised efficiencies of SEER2 17.2 and HSPF2 10.8 for this 2.5-ton central configuration.
Why this installation required a meticulous approach
In Longueuil, many houses have brick construction, an exposed concrete foundation, and sometimes restricted side spaces. In this context, installing a 2.5-ton central heat pump is not simply a matter of choosing a free spot on the property. It is necessary to plan for water drainage, snow accumulation, possible vibrations, air clearances, access to the service panel, and protection of connections.
For this installation, the outdoor unit was fixed on inclined and robust supports, above ground level. This choice is particularly relevant in Greater Montreal, where freeze-thaw cycles, snowfalls, and humidity can affect a unit installed too low. By placing the appliance higher, we help limit the risks associated with snow accumulation around the base, while facilitating future technical inspections.
The position against the brick wall was also chosen to maintain good air circulation in front of the unit. The front fan must be able to expel air without obstruction. An improper distance from an obstacle, a fence, or landscaping could harm the heat pump's performance and force the appliance to work harder. In this specific case, the installation maintains clear front clearance, which is essential for efficient operation in both cooling and heating.
A central heat pump for distributed comfort throughout the house
The choice of a central heat pump is often motivated by a need for uniform comfort. Unlike a wall-mounted air conditioner or a wall-mounted heat pump, which primarily treat an open area, a central system uses a duct network to distribute air to multiple rooms. For a family home in Longueuil, this approach generally allows for better temperature balance between the ground floor, bedrooms, hallways, and living areas.
In this project, the MIDEA EVOX G3 was chosen because it met several of the client's priorities: improving summer comfort, reducing reliance on less efficient heating during part of the winter, maintaining a discreet interior appearance, and benefiting from a modern system compatible with current energy efficiency expectations.
The EVOX G3 range is presented by Midea as a high-efficiency central solution, with a modular design intended to simplify certain installation steps and performance designed for cold climates. The manufacturer specifically indicates 100% heating capacity down to -25°C for certain systems in the range and performance that can reach 19.0 SEER2, 12.5 EER2, and 10.8 HSPF2-4, depending on the chosen configuration.
What the image reveals about the quality of the work
The photo shows several important elements of a well-executed installation:
- The unit is installed on solid wall mounts, well-aligned and suitable for the weight of the appliance.
- The electrical disconnect panel is located nearby, facilitating access during technical service.
- The connections are neatly grouped and do not unnecessarily cross the facade.
- The clearance in front of the fan is respected.
- The appliance is positioned above ground level, which is recommended in a winter context like that of Longueuil.
The brick wall adds an extra difficulty. Drilling, fixing, and aligning equipment of this weight on a masonry facade requires precision. Poor anchoring can lead to vibrations, noise, gradual sagging, or damage to the building. Our technicians therefore took care to work on the appropriate foundation part, with supports designed to keep the appliance stable.
This rigor is also noticeable in the general layout. The MIDEA unit is neatly centered in relation to the available space, without unnecessarily encroaching on the outdoor area. For an owner, this type of finish matters a lot: the installation remains technical, but it does not give the impression of having been improvised.
Technical challenges encountered on this project in Longueuil
Every HVAC installation involves invisible decisions once the project is completed. In this case, our team had to consider several constraints before finalizing the location.
The presence of existing wiring on the wall
The brick facade has high wires and an already established path along the building. It was therefore necessary to avoid any interference with these elements, both for safety and aesthetics. Our team organized the installation to keep accesses clear and avoid unnecessary crossings.
The height of the outdoor unit
A poorly chosen height could have complicated maintenance or exposed the unit to ground accumulations. Here, the wall mounts offer a balance between winter protection and accessibility. The appliance remains high enough to better withstand snow, while remaining accessible for a technician during cleaning, inspection, or diagnosis.
Vibration control
A 2.5-ton central heat pump is a substantial appliance. Even if modern systems are designed to operate more smoothly, mechanical support remains essential. A stable, well-leveled, and properly anchored mounting reduces vibrations transmitted to the building. This is particularly important on a brick wall and a concrete foundation, as vibrations can become noticeable indoors if the installation is neglected.
Accessibility of the electrical panel
The disconnect box visible to the right of the unit was placed in an accessible area. This arrangement allows for safe work during maintenance or technical intervention. A poorly placed panel, blocked by the unit or difficult to reach, unnecessarily complicates future operations.
A MIDEA EVOX G3 2.5 ton perfectly suited to the residential needs of the South Shore
The MIDEA EVOX G3 installed in Longueuil meets a very frequent demand on the South Shore: to obtain a central system capable of efficiently cooling in summer, contributing to heating in winter, and maintaining more constant comfort throughout the house. The 2.5-ton model is often considered when the building already has air distribution or when an HVAC modernization project allows for the integration of a central solution.
Concrete benefits for the owner
For the client, the goal was not just to add outdoor equipment. It was about improving the daily use of the house. A well-sized central heat pump can offer several benefits:
- More uniform temperature from one room to another.
- More discreet air conditioning than with multiple visible wall units.
- Better humidity management during warm periods.
- A more comfortable transition between seasons.
- The possibility of reducing consumption related to traditional electric heating, depending on the use and configuration of the house.
- Better integration into the interior architecture when the duct network is adapted.
In homes in Longueuil, Brossard, Saint-Hubert, and other sectors of the South Shore, we often find that homeowners wish to maintain a sober interior appearance. The central heat pump meets this expectation well, as it allows air to be distributed without installing a wall unit in each living space.
LogisVert Subsidy: an important factor to validate
Financial aid programs often influence the decision to install a central heat pump. Hydro-Québec indicates that the LogisVert program offers financial assistance for certain efficient heat pumps, and specifies that the lists of eligible models as well as the amounts may change over time. It is therefore important to check the list applicable on the installation date.
For efficient heat pumps, Hydro-Québec presents aid calculated according to the capacity at -8°C, with a formula indicated at 120 $ per 1,000 BTU/h at -8°C for certain eligible cases. AirGreen also displays, for certain versions of the MIDEA EVOX G3 2.5 tons, potential subsidy amounts related to the LogisVert program, to be validated according to the exact model, configuration, and installation date.
At AirGreen, we attach great importance to this step. A subsidy application must be supported by the correct documents, model numbers, and a compliant invoice. We help our clients understand the necessary information so that submitting the file is simpler after installation.
Mistakes to avoid before installing a central heat pump in Longueuil
A MIDEA EVOX G3 2.5 ton central heat pump project can be very advantageous, but certain errors can reduce the expected results.
Relying solely on tonnage
A 2.5-ton unit is not suitable for all homes. It is necessary to analyze the area, insulation, windows, air infiltrations, ceiling height, building orientation, and the quality of the duct network. An oversized unit can create short cycles and poor dehumidification. An undersized unit can run too long without achieving the desired comfort.
Installing the outdoor unit too close to the ground
On the South Shore, snow accumulation and ice must be taken seriously. An installation that is too low can hinder air clearance, complicate drainage, and increase the risk of blockage during winter. The choice of wall mounts in this project in Longueuil specifically addresses this reality.
Neglecting vibrations
Even a good appliance can become bothersome if it is improperly fixed. The supports, anchors, leveling, and quality of the connection play a direct role in acoustic comfort.
Forgetting maintenance
A central heat pump must be inspected regularly. Cleaning the outdoor unit, checking the coils, controlling drainage, the condition of filters, and ventilation balance help maintain performance. Good HVAC maintenance prolongs the life of the system and helps avoid costly service calls.
What distinguishes the AirGreen approach
Our team regularly works in Longueuil, but also in Montreal, Laval, on the North Shore and South Shore, for heat pump projects, wall-mounted air conditioners, central systems, and complete HVAC solutions. This volume of experience allows us to adapt each installation to the building rather than applying a single method.
In this project, success is based on several concrete decisions: choosing an unobstructed location, using adapted wall mounts, respecting electrical access, considering the brick wall, and protecting the unit against winter constraints. These details make the difference between a merely functional installation and a durable one.
We also know that homeowners are not just looking for a machine. They want clear answers to their concerns: will the system be efficient enough, will it be eligible for financial aid, will the installation be clean, will the unit be too noisy, will maintenance be simple, will the investment be coherent in the long term. Our role is to answer these questions with a well-thought-out installation and concrete explanations.
A durable, clean installation adapted to the Quebec climate
This installation of a MIDEA EVOX G3 2.5 ton central heat pump in Longueuil demonstrates the importance of professional work down to the smallest detail. The outdoor unit is solidly installed, well-cleared, accessible, and carefully integrated into a brick facade. The chosen system offers a capacity suitable for many family homes when properly sized, while meeting the heating and cooling needs specific to the Quebec climate.
For homeowners in Longueuil and on the South Shore, this type of installation represents a serious solution for improving indoor comfort, modernizing an existing system, and aiming for better energy efficiency. At AirGreen, we carry out each project with the same priority: to provide a reliable, clean, durable, and truly building-adapted HVAC installation.
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).