Installation of a MIDEA EVOX G3 central heat pump in Saint-Édouard, in Montérégie on Montreal’s South Shore

A MIDEA EVOX G3 installed against a brick wall: a central system project where the outdoor location matters just as much as performance

In Saint-Édouard, in Montérégie, in the Jardins-de-Napierville RCM, we completed an installation that clearly illustrates what a central heating modernization should be in Quebec: a MIDEA EVOX G3 central heat pump integrated into the building with particular attention paid to winter performance, airflow, service accessibility, and exterior finish.

The job-site photo immediately shows several interesting elements. The Midea outdoor unit, with its dark gray casing and large front fan, is installed along a brick wall, in a residential yard where several constraints already existed: a basement window on the left, a wooden fence on the right, electrical services against the wall, and an outdoor area used every day.

It was therefore not enough to place the condenser in the easiest location. A central heat pump installation must take into account what will happen in January under the snow, in July during a period of intense heat, but also several years later when a refrigeration technician needs access to the unit's components.

This is precisely where the EVOX G3 becomes interesting. Midea presents this generation as a central inverter system designed both for upgrading existing installations and for new residential applications.

A clean outdoor installation despite several existing constraints

On this Saint-Édouard installation, the outdoor unit is elevated on metal supports. This arrangement is particularly relevant in our climate.

A condenser installed too close to the ground can be more easily affected by:

• snow accumulation;
• ice;
• leaves and debris;
• water from defrost cycles;
• vegetation that gradually encroaches around the unit.

The unit is also positioned to keep its front horizontal airflow unobstructed. The large fan visible in the photo discharges air directly toward the open yard rather than toward the brick wall.

This detail is fundamental. A heat pump can deliver excellent performance on a technical data sheet and perform poorly if its location causes the discharged air to recirculate.

Midea designed the EVOX G3 with a vertical heat exchanger and a horizontal-discharge fan, an architecture intended to promote uniform heat exchange.

Why we did not place the unit directly on the ground

During winter heating, the outdoor heat exchanger becomes cold and must periodically run a defrost cycle. Water is then produced beneath the condenser.

In the Montreal, Laval, Longueuil and South Shore areas, this water can quickly turn into ice when temperatures drop again.

Properly raising the unit therefore helps preserve usable space beneath the heat pump and reduce the risks associated with ice buildup directly against the base.

In the photographed installation, this height also keeps the bottom of the unit well above the soil and vegetation surrounding the foundation.

The basement window was part of the equation

The small window to the left of the condenser is a good example of a constraint an installer must consider even before drilling or mounting the supports.

We must ensure that a heat pump does not unnecessarily interfere with:

• the use of a window;
• required clearance;
• drainage;
• foundation maintenance;
• future access to the building.

A central unit of this size cannot be moved like a small household appliance. Its placement must therefore be carefully considered from the outset.

Refrigerant lines routed together along the side of the house

To the right of the unit, the lines leave the condenser inside white line-hide covers that neatly route the connections toward the building.

This part of an installation is sometimes overlooked when homeowners compare quotes. However, the quality of the outdoor routing directly affects the project’s finish and the mechanical protection of the lines.

A proper installation requires, among other things:

properly sized piping, continuous insulation, connections made according to the manufacturer’s requirements, consistent drainage, and sufficient protection for exposed lines.

We also pay attention to the location of penetrations into the building. The goal is to obtain the necessary route without adding detours simply to make the installation work easier.

The electrical enclosure must remain accessible

We can also see the electrical disconnect installed against the brick behind the heat pump.

The outdoor appearance matters, but never at the expense of technical access. An appliance must be able to be electrically isolated for diagnosis and maintenance.

In a central HVAC installation, we therefore plan the unit, refrigerant lines, wiring, and disconnect as one system rather than as four independent jobs.

EVOX G3: a heat pump truly designed for Quebec's cold

The most important point for a Saint-Édouard homeowner is probably not the color of the condenser. It is what happens when the temperature drops well below freezing.

Midea documentation states that the EVOX G3 Extreme Heat offers continuous operation down to -30 °C. It also indicates heating capacity of up to 100% at -25 °C, depending on the configuration and test conditions presented by the manufacturer.

These temperatures are particularly relevant for our installations in Saint-Édouard, Montreal, Laval, Longueuil, on the North Shore and on the South Shore, where choosing a heat pump cannot rely solely on its performance at +8 °C.

M-Powevi compressor technology

Midea attributes part of its cold-weather performance to its M-Powevi compressor technology.

According to the manufacturer, the system uses, among other features, intermediate-temperature vapor injection when conditions become very cold, increasing the total amount of compressed refrigerant to support heating.

For the homeowner, the benefit is not the name of the technology, but its practical result: reducing the capacity loss usually associated with heat pumps when the outdoor temperature drops sharply.

This does not mean that auxiliary heating becomes unnecessary in every home. System sizing, building heat loss, and the backup heating strategy remain essential.

EVOX G3 capabilities: why we need to identify the exact combination

The third-generation brochure does not present a single universal EVOX G3. The range covers several central capacities, including 18,000, 24,000, 30,000, 36,000, 48,000 and 54,000 BTU/h for cooling, depending on the configurations listed.

Here are some published figures for the Extreme Heat configurations in this range:

These figures come from Midea's EVOX G3 specification table.

The nameplate is not sufficiently legible in the provided photo to reliably attribute one of these specific capacities to the Saint-Édouard unit. We therefore prefer not to invent a tonnage based solely on the apparent dimensions of the condenser.

This distinction is important for homeowners shopping for a heat pump: EVOX G3 refers to a family of systems, not a single capacity.

Efficiency is about more than SEER2

SEER2 remains an important figure for comparing cooling consumption, but in Quebec we also pay close attention to HSPF2, low-temperature COP, and the heating capacity actually available in cold weather.

Midea's documentation states that the EVOX G3 range offers up to:

• 19 SEER2;
• 12.5 EER2;
• 10.8 HSPF2;
• a COP of up to 2.14 at 5 °F, or approximately -15 °C, depending on the model and combination.

For us, these figures must be considered together. Buying a heat pump solely because its SEER2 is high can lead to overlooking the most important part of the equation for a Quebec home: its heating performance.

Why the EVOX G3 is particularly appealing when replacing an existing central system

An indoor unit designed for renovations where every inch counts

A central heat pump generally involves much more than an outdoor condenser. It works with an indoor air handler and the home's ductwork.

This is often where renovations become complex.

In a finished basement, a cramped mechanical room, or a home equipped with an older furnace, a few inches can determine whether a conversion is simple or requires a major duct modification.

Midea designed its EVOX G3 indoor unit with a modular approach. The brochure presents several installation configurations, including:

• upflow;
• downflow;
• right horizontal;
• left horizontal;
• “low-boy” configurations when available height is limited.

The manufacturer also indicates widths intended to facilitate the replacement of certain existing furnaces, with sizes ranging approximately from 14.5 to 21.5 inches depending on capacity.

For an installer, this modularity can avoid unnecessarily modifying a large part of the ventilation system.

Up to 1.2 in. of static pressure: a very interesting specification for a central system

A central heat pump must actually circulate its air through the existing ductwork.

This is where a system can be excellent on paper and disappointing in a real home if the fan and ductwork do not work properly together.

The EVOX G3 uses Computational Constant Airflow 2.0 technology. Midea indicates that its system can adapt to ductwork variations and operate at up to 1.2 in. of static pressure, according to the application presented.

The control adjusts the capacity and fan speed according to the resistance encountered. The manufacturer also provides up to 60 airflow adjustment levels.

For us, this does not mean that it is acceptable to ignore a poor ductwork system. An undersized, crushed, or excessively restrictive duct must always be evaluated.

This rather means that the indoor unit offers more latitude to be adjusted correctly to an existing installation.

A dirty filter is still a dirty filter

The system’s ability to compensate for certain pressure variations never replaces HVAC maintenance.

A homeowner must still replace or clean the filters at the appropriate time and keep the air returns and registers clear.

The EVOX G3 documentation also provides for an enhanced filtration module that can accommodate 1-, 2-, or 4-inch filters, including MERV 13 configurations.

A higher-quality filter can help capture more dust, pollen, and particles, but it must be selected and sized with the system’s airflow in mind.

Communicating thermostat or 24 V thermostat: useful flexibility for renovations

During a central system replacement, the wiring of the existing thermostat can strongly influence the complexity of the work.

The EVOX G3 supports different control strategies. Midea indicates compatibility with 485 communication as well as a 24 V mode, allowing the use of third-party thermostats in certain configurations.

The Midea system can also be paired with its communicating thermostat and the SmartHome app to manage scheduling, comfort, and certain consumption and diagnostic information.

This flexibility is particularly useful when a home already has thermostat wiring that would be difficult to replace without opening the walls.

R-454B and A2L classification: the new generation is already here

The EVOX G3 uses R-454B refrigerant.

Midea indicates a global warming potential, or GWP, of 466 and classifies this refrigerant in the A2L family.

For homeowners, the key point is to understand that installing and servicing this equipment requires procedures and equipment adapted to the refrigerant used.

Therefore, it is not only the condenser that changes with each generation of heat pumps. HVAC contractors’ work methods are also evolving.

LogisVert: verify the exact combination before promising an amount

The question of the Hydro-Québec LogisVert rebate comes up almost systematically when a customer compares central heat pumps in Saint-Édouard or elsewhere in Greater Montreal.

At present, Hydro-Québec indicates that when a residential installation meets all program criteria, the assistance is $50 per 1,000 BTU/h at -8 °C for an ENERGY STAR-certified heat pump, and $120 per 1,000 BTU/h at -8 °C for an ENERGY STAR - Cold Climate heat pump.

The essential detail is “at -8 °C”.

Therefore, you should not automatically multiply $120 by the nominal capacity listed in the product name. The amount depends on the exact combination of equipment, its recognized capacity at -8 °C, and its official eligibility at the time of installation.

Hydro-Québec also allows searches using the AHRI number or the ENERGY STAR model number, and specifies that the official list of eligible heat pumps takes precedence if it differs from the search tool.

This is the method we prefer at AirGreen: verify the combination before confirming a rebate.

The mistakes we want to avoid during a central installation

This Saint-Édouard installation serves as a reminder of several errors that can have a much greater impact than the price difference between two units:

1. Choosing the tonnage solely based on floor area. The building's heating load must be considered.
2. Installing the condenser too low. Snow, ice, and defrosting must be taken into account.
3. Neglecting the ductwork. A central heat pump cannot distribute air properly through an inadequate duct network.
4. Blocking access to the service panel or disconnect switch.
5. Promising a LogisVert amount without verifying the exact combination.
6. Installing a filter that is too restrictive without taking static pressure into account.
7. Keeping the default airflow settings without adapting them to the home.

These aspects are less visible than a Midea logo on a new condenser, but they are precisely what largely determines the day-to-day result.

What the Saint-Édouard photo summarizes in a single image

This installation shows a central EVOX G3 heat pump well integrated into an existing residential environment: an elevated outdoor unit, an unobstructed discharge side, lines grouped along the side, preserved access, and placement adapted to the yard's obstacles.

It also reminds us that a central installation should never be evaluated solely by looking at the outdoor unit.

Behind this condenser are the sizing, air handler, CFM airflow, static pressure, ductwork, thermostat, auxiliary heating settings, refrigerant connections, and commissioning.

At AirGreen, this is the full set of factors we consider when installing a central heat pump in Saint-Édouard, Montreal, Laval, Longueuil, on the North Shore, or on the South Shore.

A well-selected MIDEA EVOX G3 has features particularly suited to the Quebec climate: operation rated down to -30 °C, inverter technology, flexible indoor unit configurations, advanced airflow control, 24 V and communications compatibility, advanced filtration, and R-454B refrigerant.

But these possibilities are only valuable if the system is properly sized and installed.

That is why, on a project like this, we pay as much attention to the brick wall, the height of the supports, the clearance in front of the fan, and the routing of the lines as we do to the SEER2 figures listed in the documentation.