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

A MIDEA EVOX G3 installed on a wall bracket to withstand the Quebec winter without cluttering the yard

In Saint-Rémi, in Montérégie, we installed a MIDEA EVOX G3 central heat pump in a residence where the outdoor space had to be used intelligently. The job-site photograph alone summarizes several important technical decisions: the outdoor unit is secured to a robust metal structure anchored to the foundation, it is well clear of the ground, and its horizontal-discharge fan faces an open space.

This is not an installation where we simply placed the heat pump on a slab beside the house.

The property is bordered by a block sidewalk, the foundation has basement windows, and the façade is clad in vinyl. The choice of the unit's height and position therefore had to simultaneously preserve the building's openings, maintain good airflow, facilitate servicing, and reduce the risks associated with snow accumulation.

The MIDEA EVOX G3 is an Inverter central heat pump designed to operate with a duct network. MIDEA specifically presents this generation as a range of ducted central systems intended in particular for residential modernization projects.

For the homeowner, this means that comfort does not come from a wall-mounted head in every room: the heat pump works with an indoor air handler and distributes heating or cooling through the home's existing or adapted ductwork.

The wall bracket visible in the photo directly addresses the climate-related constraints of Saint-Rémi

The first thing we notice on this job site is the height of the outdoor unit.

The heat pump is installed well above ground level, on two horizontal rails supported by a metal structure anchored to the foundation. Supports are placed beneath the unit to create a stable base while maintaining clearance under the chassis.

This configuration is particularly interesting for a heat pump used as a heating source during the winter.

When a heat pump operates in cold weather, frost naturally forms on its outdoor coil. The system must periodically perform a defrost cycle. The water resulting from this process must then be able to drain away.

If the unit is installed too low, several problems can arise:

• snow can obstruct part of the heat exchanger;
• defrost water can form a large mass of ice beneath the machine;
• the unit's base may become trapped in ice;
• access for maintenance becomes more difficult;
• snow removal around the heat pump becomes more difficult.

In Saint-Rémi, as elsewhere on the South Shore, the support height is therefore not merely an aesthetic choice. It directly contributes to preparing the installation for winter.

A horizontal discharge oriented toward an unobstructed area

The EVOX G3's large front fan is clearly visible in the photograph. Its orientation is another essential consideration for the project.

MIDEA documentation describes an outdoor design with horizontal discharge, featuring a horizontal fan and a vertical heat exchanger. According to the manufacturer, this architecture promotes more uniform airflow across the heat exchanger's surface, particularly as temperatures drop.

A unit of this type needs to breathe.

We therefore avoid placing the air outlet directly in front of:

• a very nearby fence;
• a perpendicular wall;
• a shed;
• a particularly dense hedge;
• another unit;
• an area where snow naturally accumulates.

On this project, the fan is oriented toward the outside of the facade and has significant clearance in front of it.

An installation that takes the basement windows into account

The photograph also shows two basement windows near the equipment.

The heat pump is installed between the openings and high enough to avoid sitting directly in front of either one. This is exactly the kind of constraint we need to consider before determining the final location of a central unit.

The best location for a condenser never depends on a single criterion.

We need to balance:

the manufacturer's clearances, airflow, mechanical access, windows, refrigerant lines, electrical connections, snow level, and the yard's daily use.

Moving the unit a few dozen centimeters can sometimes significantly improve the final result.

The difference between a MIDEA EVOX G3 and a conventional central heat pump

Inverter technology allows the heat pump to modulate its operation rather than relying solely on operation at full capacity followed by a complete shutdown.

In a home well suited to the system, this modulation can help:

• more consistent indoor temperature;
• longer and more stable operating periods;
• better adaptation to partial loads;
• more gradual heating control;
• better comfort during the transitional periods of fall and spring.

This becomes particularly interesting in our climate, where a home’s needs can vary greatly between an October day at 10 °C and a January night well below zero.

Advertised heating performance down to very low temperatures

The EVOX G3 brochure strongly emphasizes its performance in cold climates.

MIDEA states that this platform can operate continuously down to -30 °C. The documentation also shows, under certain operating conditions, heating capacity of up to 100% at -25 °C, with a COP of up to 1.9. Some data in this section are based on tests of a 3-ton MIDEA system.

The manufacturer explains that its compressor architecture uses, among other features, intermediate-temperature vapor injection when conditions become extremely cold in order to increase the amount of compressed refrigerant and support heating capacity.

For a central heat pump installation in Saint-Rémi, these characteristics are much more relevant than a comparison based solely on cooling efficiency.

A product range with efficiency of up to 19 SEER2 and 10.8 HSPF2

MIDEA’s technical documentation presents several capacities of the third-generation EVOX.

Depending on the equipment combination, the product range offers performance of up to:

• 19 SEER2;
• 12.5 EER2;
• 10.8 HSPF2;
• COP of 2.14 at 5 °F, or approximately -15 °C.

It is important to understand the term “up to.”

These are the best values presented for the complete product range. They do not mean that all EVOX G3 capacities have exactly a SEER2 of 19 or an HSPF2 of 10.8.

The brochure presents nominal configurations of 18,000, 24,000, 30,000, 36,000, 48,000 and 54,000 BTU/h, among others, with different performance depending on the indoor/outdoor combination.

Because the precise capacity of the unit installed in Saint-Rémi cannot be read with sufficient certainty from the photograph provided, we are not arbitrarily assigning it a tonnage. For an installation record, a LogisVert application, or a future replacement, the exact model numbers shown on the nameplates should be used as the reference.

The R-454B refrigerant is part of the next-generation EVOX design

The EVOX G3 uses R-454B, an A2L-class refrigerant.

MIDEA states in its documentation that it selected R-454B for its EVOX central range and specifies a global warming potential, or GWP, of 466.

For our teams, this evolution changes certain aspects of the work.

An R-454B installation requires procedures, equipment, and practices compatible with A2L refrigerants. The professional must also follow the manufacturer's precise instructions regarding the equipment, connections, and commissioning.

For the homeowner, the key point is simpler: the installer's expertise remains just as important as the technology purchased.

From the outdoor unit to the ductwork: the details that determine the outcome of a central installation

The EVOX G3 was designed to adapt to existing central systems

In many homes in Saint-Rémi, Montréal, Laval, Longueuil, North Shore and South Shore, the project involves replacing an old system rather than designing the HVAC system entirely from scratch for a new construction.

The EVOX G3 air handler was specifically developed with this reality in mind.

MIDEA announces a narrow design whose width is close to that of several existing furnaces. The indoor platform can also adapt to a 115 V or 208/230 V power supply, depending on the application, to facilitate certain renovations.

This does not mean that every old furnace can be replaced without any modifications.

We must always check:

• the plenum width;
• the available height;
• the air return;
• the transition to the existing ductwork;
• the condensate drain;
• the filtration;
• the electrical supply;
• the location of the auxiliary heater.

A modular indoor unit suited to challenging mechanical rooms

MIDEA uses a modular design called Block N Lock. The brochure shows various installation options for the air handler, including upflow, downflow, right horizontal, left horizontal, and low-clearance applications.

This is a tangible advantage in renovations.

A basement mechanical room was not always built to accommodate a modern central heat pump. Existing ducts, plumbing pipes, beams, or electrical installations may limit the available space.

Being able to adjust the unit's orientation therefore makes certain projects easier, whereas traditional equipment would require more extensive modifications.

The ductwork remains at the heart of performance

A central heat pump can have excellent technical specifications and still deliver disappointing results if the distribution system is inadequate.

We therefore pay particular attention to the airflow.

The EVOX G3 incorporates Computational Constant Airflow 2.0 technology. According to MIDEA, the blower can adjust its speed and power to changes in the duct system, with examples showing the maintenance of 1,200 CFM between 0.4 and 1.2 in. of total static pressure.

The technology also allows up to 60 airflow volume adjustment levels, configurable according to the installation’s needs.

However, this capability never exempts us from checking the system.

A duct that is too small remains a duct that is too small

A sophisticated ECM blower can compensate for certain resistance variations, but it cannot make a severely undersized system function perfectly.

Before commissioning, we must therefore consider the supplies, returns, dampers, grilles, and filtration.

MERV 13 filtration can be integrated into the platform

The EVOX G3 documentation provides for an enhanced filtration module compatible with 1-, 2-, or 4-inch MERV 13 filters. The manufacturer indicates that this filtration can capture more dust, pollen, particles, and pet hair or dander, while helping keep the coil cleaner.

However, a more restrictive filter must be taken into consideration when adjusting the airflow.

Installing the filter with the highest possible MERV rating is not automatically the best strategy if the return-air system is not designed for the corresponding resistance.

We always look at the complete system.

Auxiliary heating is part of winter sizing

MIDEA offers multi-stage auxiliary heating kits for this platform that can reach 25 kW, depending on the application. The manufacturer also indicates that their activation can be modulated according to temperature variations.

In Quebec, this supplemental heating can be important during certain winter peaks.

However, the maximum available electric resistance should not be selected automatically.

A higher resistance also results in a higher electrical load.

We therefore assess:

• the building’s heat loss;
• the heat pump’s low-temperature capacity;
• the electrical panel capacity;
• the necessary backup heating;
• thermostat setting;
• the operating strategy during severe cold.

Saint-Rémi’s outdoor location also facilitates servicing

The photograph shows another advantage of this installation: the unit remains accessible.

It is placed near the house, but it is not squeezed into a niche. The front of the fan is unobstructed, and the cabinet remains accessible from the sides.

This accessibility becomes valuable when it is necessary to perform:

• heat exchanger cleaning;
• an electrical inspection;
• a diagnosis;
• a connection check;
• preventive maintenance;
• an intervention on the internal components.

HVAC equipment is designed to last for many years. We therefore always prefer to plan today for the intervention of the technician who may be needed several years later.

Clearance from the ground also protects the landscaping

In this yard in Saint-Rémi, a sidewalk runs alongside the house, and decorative stones occupy the strip near the foundation.

A heat pump placed directly in this area would have reduced the available space and exposed its base more to leaves, soil, grass, and moisture.

The wall bracket frees up the space beneath the unit.

It also keeps the heat pump away from normal yard maintenance activities, including mowing the lawn and cleaning around the foundation.

Mistakes to avoid when replacing a central system

Automatically reusing the old ductwork without measuring airflow

The fact that an old furnace operated for twenty years does not prove that the ducts are optimized for the new heat pump.

Installing the outdoor unit too low

For a heat pump that must operate in January and February, snow accumulation and defrost water must be considered from the time of installation.

Obstructing the air outlet

A horizontal-discharge heat pump must have suitable space in front of its fan.

Choosing the tonnage based solely on floor area

Insulation, air tightness, windows, and the building’s heat loss directly affect the capacity actually required.

Using the best SEER2 rating in the brochure as a universal value

Performance varies from one combination to another. The technical data sheet for the exact system remains essential.

Neglecting auxiliary heating

The backup heating capacity must be consistent with the home’s needs and the available electrical installation.

MIDEA EVOX G3 Heat Pump and LogisVert Financial Assistance in 2026

For an installation in Quebec, LogisVert eligibility must always be validated based on the exact model combination.

According to the rules currently published by Hydro-Québec, heat pumps installed since November 26, 2025 must be ENERGY STAR certified to be eligible. When all conditions are met, the incentive for a heat pump is $50 per 1,000 BTU/h of heating capacity at -8 °C, or $120 per 1,000 BTU/h at -8 °C when it is recognized as ENERGY STAR “cold climate.”

Hydro-Québec also specifies that its search tool can be used to verify a heat pump using the AHRI number, and that the applicable amount depends in particular on the installation date and the eligible combination.

For this installation photographed in Saint-Rémi, we therefore do not publish a specific rebate amount without the complete number of the installed combination. This is an important precaution: EVOX G3 refers to a product family, whereas LogisVert evaluates a precisely defined set of equipment.

Our AirGreen approach to a central heat pump in Saint-Rémi

On a project like this, our work is not limited to choosing the brand.

We must coordinate:

1. the heat pump sizing;
2. the condition of the duct network;
3. the air handler;
4. the electrical capacity;
5. the auxiliary heating;
6. the thermostat and control strategy;
7. the outdoor location;
8. the clearances and support;
9. the refrigerant lines;
10. commissioning.

The final photograph shows only the outdoor unit, but behind this condenser lies an entire distribution system that must operate as a whole.

This is especially true with an Inverter central heat pump: compressor modulation and airflow control must work with the building, rather than struggle against an unsuitable duct network.

A clean installation for a machine designed for all four seasons

This MIDEA EVOX G3 central heat pump project in Saint-Rémi clearly illustrates how we approach central installations on the South Shore of Montreal.

The outdoor unit is securely installed on an elevated structure. The fan retains open space in front of it. Basement windows remain functional. The machine remains accessible. The clearance beneath the chassis is suitable for a unit intended to operate throughout the winter.

The EVOX G3 then brings its own technical advantages: operation announced down to -30 °C, Inverter technology, horizontal discharge architecture, R-454B refrigerant, adaptable air treatment and advanced airflow management.

At AirGreen, we install and replace central heat pumps in Saint-Rémi, Montreal, Laval, Longueuil, on the North Shore and on the South Shore. For us, a successful installation is measured by more than simply starting the machine on the day of the project. It must be designed to continue heating, cooling and being properly maintained several winters and summers later.