Installation of a MIDEA EVOX G3 central heat pump in L’Île-Perrot
In L’Île-Perrot, AirGreen installs a MIDEA EVOX G3 central heat pump on wall brackets, with a brick-matching line-set cover, inverter technology, R-454B, and a design adapted to Quebec winters.
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 compact installation on a brick facade, designed to preserve outdoor space and protect the heat pump in winter
À L’Île-Perrot, this installation of a MIDEA EVOX G3 central heat pump illustrates a challenge we often encounter in residential areas of western Montreal: integrating a high-performance central system into an existing property without unnecessarily transforming the yard, obstructing a passageway, or adding multiple exposed conduits to the facade.
The site photo shows an especially compact installation. The MIDEA outdoor unit is installed directly in front of a brick facade, beneath a window, on two wall-mounted metal supports. On the left, a brown-red line-set cover runs vertically along the wall and blends in much better with the masonry than a conventional white conduit. Lower down, the electrical disconnect remains accessible. Vegetation grows nearby, but the fan grille remains largely unobstructed.
The result is therefore not merely a machine mounted outside the house. It is an HVAC installation adapted to the building’s actual architecture.
The EVOX G3 belongs to the family of MIDEA inverter ducted central systems, designed as a modernization solution for homes already equipped with a duct network.
Why wall mounting made particularly good sense here
One of the most interesting aspects of this L’Île-Perrot project is the decision not to place the outdoor unit directly on the ground.
In the photo, the heat pump is supported by two sturdy metal brackets anchored to the building’s structure. This configuration keeps the area beneath the unit clear.
In our climate, this clearance offers several concrete advantages.
Snow remains farther away from the unit’s base. A heat pump used as the primary heating source must continue moving large quantities of air even after snow has accumulated.
There is more room for defrost water. In winter, the outdoor heat exchanger can accumulate frost. During defrosting, this frost becomes water before it can refreeze on the ground. An installation that is too low encourages the formation of a mass of ice directly beneath the machine.
The ground remains clear. In an area where the distances between the house, plantings, and traffic zones may be limited, freeing up a few square feet of ground makes a real difference.
The underside of the unit remains visible. This is useful during inspections and future HVAC maintenance.
In Île-Perrot, as in Montreal, Laval, Longueuil, the North Shore, and the South Shore, we therefore do not consider the support a simple accessory. Its selection is part of the project.
An installation directly beneath a window: what this changes
Positioning the outdoor unit beneath a window also requires consideration of its height, clearance, and access.
We aim to prevent a heat pump from interfering with the window opening or unnecessarily complicating its maintenance. In this installation, the unit remains below the window’s lower level while being high enough above the ground.
This compact arrangement keeps the equipment in an area of the facade that is already technical, rather than occupying another wall or unnecessarily extending the refrigerant lines.
It also reduces the visual distance between the machine and the line-set cover.
For a homeowner, this may seem secondary. Yet HVAC installations often remain visible for fifteen years or more. The way the lines, disconnect switch, and heat pump are arranged on a facade therefore matters almost as much as the interior finish.
A brown line-set cover that blends in with the brick
To the left of the heat pump, we can see a long vertical brown-red section.
It is a simple detail, but particularly worthwhile on this home.
The refrigerant lines of a central heat pump must reach the indoor unit, often installed in the basement, garage, mechanical room, or another part of the house. Depending on the building’s configuration, the outdoor route can therefore be considerable.
We therefore aim to protect:
- the refrigerant lines;
- the insulation;
- certain control cables;
- and, depending on the layout, other components associated with the installation.
Using a line-set cover makes this layout more orderly and provides additional mechanical protection.
Here, the chosen color closely matches the brick and the adjacent downspout. Instead of a large, highly contrasting white element, the routing becomes much more discreet.
This is a concrete example of how we can improve an installation without changing its mechanical operation.
A completely unobstructed fan grille
The EVOX G3 outdoor unit uses a horizontal discharge design.
The large front fan visible in the photo must be able to discharge air freely through its grille. MIDEA describes this generation with a horizontal fan paired with a vertical heat exchanger, an architecture designed to achieve uniform airflow across the heat exchange surface and maintain good performance as the temperature drops.
That is why we pay as much attention to what is in front of the unit as to what is behind it.
In this installation, the area in front of the fan is open.
The vegetation visible on the left must nevertheless be maintained over time. A plant that seems far enough away today can grow several dozen centimeters over the seasons.
We therefore always recommend keeping branches and foliage away from the heat exchanger and the discharge grille.
A central heat pump designed for cold climates
The EVOX G3 is particularly interesting for a Quebec installation because MIDEA developed it for low-temperature heating.
The documentation indicates continuous operation down to -30 °C. It also shows, based on tests of a three-ton MIDEA system, heating reaching 100% of rated capacity at approximately -25 °C, with a COP of up to 1.9.
This type of data must nevertheless be interpreted precisely.
"Operation down to -30 °C" does not mean that all EVOX G3 capacities produce exactly the same number of BTUs at -30 °C as at +8 °C.
Available capacity depends in particular on:
- installed capacity;
- indoor-outdoor pairing;
- outdoor temperature;
- the home's heat load;
- airflow;
- and the auxiliary heating strategy.
For our installations, we therefore prefer to analyze the performance of the complete system rather than focus on a single minimum temperature.
M-Powevi: how MIDEA supports heating in extreme cold
The brochure also presents M-Powevi compressor technology.
MIDEA explains that, in very cold conditions, the system introduces intermediate-temperature vapor to increase the amount of compressed refrigerant and thereby support heating performance. The manufacturer also mentions a high-efficiency compressor motor and an optimized discharge circuit.
For a residence in L’Île-Perrot, this type of design is relevant because the heat pump is not merely an air conditioner that operates for a few months each year.
It must contribute to heating for a significant part of the winter.
A range from 18,000 to 54,000 BTU of nominal cooling capacity
The EVOX G3 is available in several capacities.
The MIDEA technical table provided with this project lists systems with 18,000, 24,000, 30,000, 36,000, 48,000, and 54,000 BTU/h of nominal cooling capacity, depending on the selected combination.
However, the exterior photo does not make it possible to read the nameplate of this installation in L’Île-Perrot clearly.
We therefore do not want to artificially assign a tonnage to the unit shown in the photograph.
A proper quotation should always identify precisely:
- the outdoor model;
- the indoor model;
- the nominal capacity;
- the heating capacity available at low temperatures;
- and the applicable AHRI number.
Relying solely on the size of the outdoor cabinet can easily lead to an error.
Performance of up to 19 SEER2
The EVOX G3 line covers several efficiency levels.
MIDEA indicates performance of up to 19 SEER2, 12.5 EER2, 10.8 HSPF2, and a COP at 5 °F of up to 2.14.
The technical table shows that each capacity has its own values.
For example, the 18,000 BTU system is listed at 19 SEER2, 12.5 EER2, and 10.1 HSPF2. The 24,000 BTU version is rated at 18.6 SEER2 and 10 HSPF2, while the 30,000 BTU system shows 17.2 SEER2 and 10.8 HSPF2.
That is why the expression “up to 19 SEER2” should be understood as the maximum performance for the product line.
We always prefer to present the customer with the values that correspond exactly to their equipment.
The important thing is not to choose the largest unit
A common mistake with a central heat pump is thinking that a higher tonnage automatically means an improvement.
That is not the case.
The capacity must be adapted to the residence’s actual needs.
An oversized unit can shorten cycle times, disrupt dehumidification in summer and make balancing the ductwork more difficult.
A heat pump that is too small may instead rely too quickly on auxiliary heating during cold periods.
We therefore consider:
- the home's insulation;
- fenestration;
- air infiltration;
- orientation;
- square footage;
- the ductwork;
- return-air capacity;
- and winter heat losses.
A simplified rule based solely on square footage is not sufficient for a serious central installation.
This L’Île-Perrot project mainly demonstrates the importance of integrating the EVOX G3 into the existing system
The indoor unit is just as important as the condenser visible outside
The photograph shows the exterior side of the project, but the most important half of comfort distribution is inside.
The air handler must supply every room through the ductwork.
MIDEA developed the EVOX G3 with a modular design allowing different installation positions, including upflow, downflow, right horizontal and left horizontal, as well as certain low-boy configurations.
This flexibility is particularly useful in existing homes in L’Île-Perrot, Montréal or Longueuil, where the mechanical room was obviously not originally designed to accommodate a heat pump manufactured in 2026.
Dimensions designed to facilitate certain replacements
MIDEA offers indoor units in different widths, approximately 14.5 to 21.5 inches, with an architecture that can accommodate 115 V or 208/230 V depending on the configuration. The manufacturer positions this design as a way to facilitate the replacement of certain existing furnaces.
For us, this aspect can greatly reduce a project's complexity.
A mechanical room may contain:
- an electrical connection;
- a water heater;
- ductwork;
- plumbing pipes;
- a drain;
- an air exchanger;
- and several other pieces of equipment.
The ability to adapt the indoor unit's configuration can sometimes avoid major modifications to the ductwork.
The ductwork remains a critical element
Even the best central heat pump cannot provide uniform comfort if the ductwork cannot move air properly.
MIDEA integrates a technology called Computational Constant Airflow 2.0 into the EVOX G3.
The manufacturer announces an operating capacity of up to approximately 1.2 in. of water-column static pressure, as well as an adjustment range of up to 60 airflow levels.
According to MIDEA, the fan can adjust its output and speed to adapt to certain variations in the system, particularly those caused by the ducts, a more restrictive filter, or a partially obstructed heat exchanger.
This technology offers an interesting adjustment range.
However, it does not allow the network's design to be neglected.
A return duct that is too small remains a duct that is too small.
MERV 13 filtration in 1-, 2-, or 4-inch formats
Filtration is another element often underestimated when replacing a central system.
The EVOX G3 includes a module compatible with MERV 13 filters in 1-, 2-, or 4-inch formats. MIDEA indicates that this type of filtration can capture more dust, pollen, particles, and pet hair or dander, while helping keep the indoor coil cleaner.
Static pressure must nevertheless be considered.
We do not automatically recommend the most restrictive filter available. The chosen filter must be compatible with the airflow required by the system.
Up to 25 kW of auxiliary heating
A Quebec central heat pump must also have an appropriate strategy for heating peaks.
MIDEA provides three-stage auxiliary electric heating elements capable of reaching 25 kW, depending on the configuration. The manufacturer mentions activation and adjustment based on temperature changes and demand.
The sizing of these components must take the heat pump and the building into account.
We seek to avoid two extremes:
- insufficient auxiliary power when the home actually needs it;
- an overused resistance heater even though the heat pump could still efficiently provide a significant portion of the load.
24 V control or communicating system
The EVOX G3 also offers several control options.
MIDEA indicates compatibility with 485 communication as well as traditional 24 V thermostats. The range also includes a Sub-1 GHz communication solution between certain components, which can reduce the need to run new communication wires in an existing home.
For a renovation, this flexibility is valuable.
Rerouting a thermostat wire through several floors can sometimes be more complex than installing the equipment itself.
R-454B: the refrigerant used by this EVOX generation
The EVOX G3 lineup uses R-454B.
MIDEA specifies in its documentation that this A2L refrigerant was selected for this new family and indicates a global warming potential, or GWP, of 466.
This change also requires appropriate installation and service methods.
During commissioning, we must pay particular attention to:
- pipe preparation;
- connections;
- leak testing;
- evacuation;
- insulation;
- and when starting the system.
The refrigerant has changed, but the need for meticulous installation remains exactly the same.
Vegetation: a detail to monitor after we leave
The photo of this installation in L’Île-Perrot shows a lot of vegetation to the left of the outdoor unit.
This is not necessarily a problem today, but it is a maintenance point to keep in mind.
Leaves and branches should not gradually get closer to the heat exchanger.
Over the seasons, we recommend that the homeowner trim vegetation and remove debris that may accumulate behind or around the unit.
A clean, well-ventilated heat exchanger allows the heat pump to operate under better conditions.
Why the line-set cover also deserves a visual inspection
An outdoor line-set cover protects the lines, but it also needs to remain in good condition.
After winter, it is useful to check that:
- the sections have not shifted;
- no fasteners are loose;
- the snow or ice has not deformed the bottom of the run;
- and the building entrance remains properly protected.
On this installation, the brown cover is highly visible because of its height, but relatively discreet thanks to its color.
This is exactly the kind of finish that deserves to be kept clean throughout the system’s service life.
ENERGY STAR: verify the exact system rather than simply the EVOX G3 name
MIDEA documentation indicates that the lineup shown exceeds the ENERGY STAR Most Efficient specifications associated with this family of equipment.
However, this does not mean that a homeowner should automatically infer eligibility for a specific financial incentive solely because “EVOX G3” appears on their quote.
For any rebate-related question, we need to verify:
- the exact outdoor model;
- the exact indoor model;
- the match-up;
- the AHRI number;
- the criteria of the program applicable on the installation date.
The technical brochure confirms the performance of the range; it does not by itself provide the amount of a Quebec subsidy for the photographed system.
Mistakes this installation helps avoid
This L’Île-Perrot project summarizes several best practices for a central heat pump.
Avoid installing it too close to the ground.
Winter clearance matters enormously in Quebec.
Do not sacrifice the exterior finish.
A properly positioned and selected line-set cover can significantly reduce the visual impact of the work.
Keep clearance in front of the fan.
Horizontal discharge needs space.
Plan for plant growth.
A hedge or plant must be maintained after installation.
Do not choose the tonnage by looking only at the cabinet.
The model plate and AHRI data are the reference.
Do not ignore the existing ductwork.
The heat pump, blower, and ductwork form a single system.
Do not confuse “up to 19 SEER2” with the performance of all models.
Each capacity has its own values.
An installation that focuses as much on integration as on the machine
This MIDEA EVOX G3 central heat pump installed in L’Île-Perrot stands out above all for how it integrates with an existing facade.
We have an outdoor unit installed at height, a large unobstructed discharge area, a protected vertical route, a line-set cover suited to the brick color, and an installation concentrated in a relatively narrow area beneath a window.
This is exactly what we look for in our projects: preventing the heat pump from looking like an element added without planning.
The EVOX G3 then provides the technology required for a modern central system: inverter, low-temperature heating, R-454B, 24 V or communicating compatibility, adaptive airflow blower, MERV 13 filtration, and modular indoor unit.
But a good machine can never replace a good installation.
At AirGreen, we apply this approach in L’Île-Perrot, Montreal, Laval, Longueuil, on the North Shore and the South Shore, adapting each project to the home, the ductwork, outdoor constraints, and Quebec’s climate.
Here, this resulted in a compact and structured installation that preserves floor space while keeping the MIDEA EVOX G3 properly positioned for the seasons to come.
How it goes, from the first call to the end
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 the unit delivers when it is cold
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.
And 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.
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.
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What people ask us about this kind of work
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Furnace, air handler, ducted: what is the difference?
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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).