A central installation where outdoor positioning matters just as much as the machine's performance
At Saint-Cyprien-de-Napierville, we installed a MIDEA EVOX G3 central heat pump in a configuration that is particularly well suited to Quebec's climate. The site photo immediately shows several important technical choices: a horizontal-discharge outdoor unit installed on a raised metal structure, a completely unobstructed front area in front of the fan, connections grouped on the service side, and an electrical disconnect installed nearby on the exterior wall.
This is not an improvised installation at the foot of the foundation. The heat pump is deliberately positioned above the ground, near the vinyl siding, while keeping its service side accessible. In a region like Saint-Cyprien-de-Napierville, where snow, freezing, defrost cycles, and significant temperature variations are part of normal operating conditions, these few dozen centimetres of clearance become very important.
The selected model belongs to the new generation of MIDEA EVOX G3 Inverter ducted central systems, a product family developed for heating and cooling projects with ductwork. MIDEA presents this generation as a central upgrade solution, with an architecture designed in particular to facilitate the replacement of existing systems.
What we can actually see in this installation in Saint-Cyprien-de-Napierville
The outdoor unit is imposing, but its installation remains remarkably compact.
It is positioned parallel to the wall of the residence. The main fan blows directly outward, with no fence, wall, or other obstacle immediately in front of the grille. This detail is essential: a horizontal-discharge central heat pump needs adequate space to expel the air that passes through its heat exchanger.
Under the machine, we can clearly see a metal frame that keeps the condenser at a safe distance from the ground. The unit's feet rest on support points attached to this structure. On the right, the refrigeration lines and connections enter directly into the service compartment; the exterior wiring is neatly routed toward an electrical disconnect mounted on the wall.
For us, this arrangement offers several practical advantages:
- it keeps the bottom of the heat pump away from the ground, mud, leaves, and some of the snow accumulation;
- it provides more space for water drainage from defrost cycles;
- it keeps the fan face clear;
- it maintains relatively direct access to the technical side of the unit;
- it avoids placing a large outdoor unit directly in the vegetation area at the foot of the house;
- it facilitates cleaning and HVAC maintenance around the unit.
These are very concrete considerations. A heat pump may have excellent technical data on paper; if its heat exchanger is buried in snow or its service side becomes inaccessible, the installation does not make full use of the unit.
A horizontal-discharge design well suited to this type of location
The EVOX G3 outdoor unit shown in the photograph uses a large front-facing propeller. Air passes through the heat exchanger and is then discharged horizontally in front of the machine.
MIDEA explains in its documentation that the outdoor unit uses a horizontal-discharge fan with a vertical heat exchanger, an architecture intended to achieve more uniform airflow across the exchanger’s surface. The manufacturer associates this design with better heat exchange as the outdoor temperature decreases.
On this project, this geometry has an obvious advantage: we can raise the unit without creating a large vertical column comparable to certain traditional central condensers.
Nevertheless, we must always respect the prescribed clearances around the machine. The fact that a unit is compact does not mean it can be wedged against a structure without considering its airflow.
The cold in Montérégie was a central criterion in choosing the system
A central heat pump in Saint-Cyprien-de-Napierville cannot be selected as if it were intended to operate only during mild autumn periods.
The EVOX G3 brochure states that it can operate continuously down to -30 °C. MIDEA also indicates, for its Extreme Heat system tests, a capacity of up to 100% at -25 °C, with a COP of up to 1.9; the manufacturer specifies that some of the performance data presented are based on a three-ton system.
This nuance is important.
Saying that a heat pump “operates at -30 °C” does not mean that it produces exactly the same amount of heat at -30 °C as it does at +8 °C. Available capacity and COP vary with temperature. That is why, when we size a central installation, we look at the capacity curve, the home's heat loss, the ductwork, and the auxiliary heating capacity, rather than only the minimum temperature printed in a brochure.
MIDEA uses its M-Powevi compressor technology, designed to increase the flow of compressed refrigerant when it is extremely cold.
For a home located in Montérégie, this low-temperature approach is much more relevant than a central heat pump sized primarily for summer cooling.
What is the exact capacity of this EVOX G3?
The EVOX G3 product line covers several capacities. The technical table provided by MIDEA lists systems of 18,000, 24,000, 30,000, 36,000, 48,000, and 54,000 BTU/h in cooling, depending on the indoor-outdoor pairing.
In the photograph from Saint-Cyprien-de-Napierville, the side rating plate is present, but its text is not clear enough to honestly confirm the exact model number and tonnage of this installation. We therefore do not turn a visual estimate into a technical specification.
This is a principle we also apply in our quotes: the capacity of a central heat pump must be confirmed using the model number and AHRI pairing, rather than determined based on the apparent size of the cabinet.
The EVOX G3 documentation does, however, clearly show the available performance range. Depending on the capacity selected, the manufacturer advertises a SEER2 of up to 19, an EER2 of up to 12.5, an HSPF2 of up to 10.8, and a COP at 5 °F of up to 2.14.
A concrete example: the 2.5-ton EVOX G3
To understand what these figures represent, let us consider the 30,000 BTU MIDEA EVOX G3 pairing, or 2.5 tons, without claiming that this is necessarily the capacity shown in the photograph of this installation.
The MAUSE-H30B-2A system with MO1HE-H30B-2A is associated with AHRI number 215471341. It has a SEER2 of 17.2, an EER2 of 12.0, and an HSPF2 of 10.8. The product line documentation also indicates approximately 33,200 BTU/h of heating capacity at -15 °C, with a COP of 1.97 under this condition.
The official MIDEA documentation published for this pairing also confirms AHRI reference 215471341.
This example shows why two heat pumps simply advertised as “central” can deliver very different results. Capacity, seasonal efficiency and, above all, available output in very cold weather deserve to be compared individually.
R-454B: an important change in this MIDEA generation
The EVOX G3 uses R-454B refrigerant.
MIDEA states that it chose R-454B for its new product line and announces a global warming potential, or GWP, of 466.
For our HVAC installations, this change is not limited to the name of the refrigerant written on a label. R-454B belongs to the A2L classification, which requires appropriate work, handling and commissioning methods.
In the field, we must therefore service the refrigeration circuit in accordance with the manufacturer's specifications and the requirements applicable to this new generation of equipment.
The real appeal of a central EVOX G3 is also found inside the home
The photograph mainly shows the outdoor unit, but a central heat pump operates as a system.
Inside, the air handler supplies the duct system that distributes heated or cooled air throughout the different rooms. Distribution quality therefore depends greatly on the condition of the ducts, air returns, filtration and static pressure.
This is precisely an aspect on which MIDEA has done a great deal of work with the EVOX G3.
The Computational Constant Airflow 2.0 technology is designed to automatically adjust the fan's output and speed when duct system conditions change. MIDEA states that the system can operate at up to 1.2 in. of water column static pressure and that the airflow can be adjusted across up to 60 levels.
The manufacturer also explains that this control can compensate for certain variations caused by the duct system, a dirty filter, a clogged coil or imperfect duct sizing.
This obviously does not mean that a heat pump can fix a poor duct system. A duct that is too small remains too small. An inadequate return grille remains a restriction.
By contrast, a variable-speed blower capable of working intelligently with the home's actual static pressure offers many more possibilities than a fan set to operate only at a few fixed speeds.
An indoor unit designed to simplify certain furnace replacements
Another very interesting feature of the EVOX G3 generation is the design of the indoor module.
MIDEA offers widths ranging from approximately 14.5 to 21.5 in., comparable to several residential furnace sizes, as well as a multivoltage power supply allowing 115 V or 208/230 V, depending on the configuration. The manufacturer explains that this architecture is intended to facilitate certain conversions or upgrades of existing systems.
For us, this can become very useful in basements where mechanical space is limited.
The brochure also presents an optional three-stage auxiliary heater that can reach 25 kW depending on the configuration.
In Quebec's climate, auxiliary heating should not be treated as an accessory added at the last minute. We need to size it together with the heat pump and the home's actual needs.
A modular design for mechanical rooms with difficult access
Transporting a large air handler into an old basement or attic can become a real challenge.
MIDEA designed the EVOX G3 with a locking modular structure. The documentation indicates six installation options, including upflow vertical, downflow vertical, right horizontal, left horizontal and certain low-boy configurations.
This modularity is important for an installation company.
We cannot make a staircase wider simply because a new unit is larger than the old furnace. A unit that can be disassembled into modules offers more options for navigating restricted access points and reconfiguring the equipment once inside the mechanical room.
24 V compatibility, 485 communication and control options
A central replacement often raises another question: do all the thermostat wires need to be replaced?
The EVOX G3 offers several options. MIDEA announces compatibility with 485 communication as well as traditional 24 V controls. The system can automatically identify the control mode being used, making certain upgrades with an existing thermostat or a compatible third-party thermostat easier.
The range also offers Sub-1 GHz wireless communication between certain EVOX components and the MIDEA communicating thermostat, which can eliminate the need for some lengthy new communication wiring.
For the homeowner, this means greater flexibility when replacing an existing central system.
MERV 13 filtration and intelligent control
The quality of a central system also depends on what we circulate through the ducts.
MIDEA provides a filtration module that can accept 1-, 2-, or 4-inch MERV 13 filters, depending on the configuration. The manufacturer points out that better filtration can capture more dust, pollen, particles, and pet hair or dander, while helping keep the indoor coil cleaner.
The EVOX G3 can also be paired with the MIDEA communicating thermostat and the SmartHome app to manage schedules, temperature, and humidity, and to view certain consumption data. The platform also provides diagnostic and remote update functions.
For us, these functions are useful when they genuinely support operation of the system. The best thermostat is still one that is properly configured with the airflow, the heat pump, and the auxiliary heating stages.
This Saint-Cyprien-de-Napierville project shows why a central heat pump must be installed as a complete system
The outdoor support is not just a simple accessory
Let’s return to the most visible part of this installation: the metal support.
The EVOX G3 outdoor unit is positioned high enough to clear the lower part of the unit. In a yard where we can see soil and vegetation directly beneath the heat pump, installing the machine at ground level would have created a much less desirable situation in the long term.
The elevation helps limit contact with debris and leaves room for the water produced during winter defrost cycles.
We must also ensure mechanical stability. An inverter heat pump contains a compressor and a large fan whose speed varies. An inadequate support can promote vibrations or resonance.
On this installation, the weight is supported by a rigid metal frame rather than simply being set on the ground.
The service side must remain accessible
An error we sometimes encounter on existing installations is placing the unit so close to an obstacle that accessing the connections becomes very difficult.
In the photo of our project in Saint-Cyprien-de-Napierville, the connections are grouped on the right side. We can see the insulated lines entering the lower compartment and the electrical connections reaching the unit’s technical section.
This organization is important during commissioning, and it will still be important several years later during a diagnostic.
A good installation should not only be clean on the day we take the photo. It must remain serviceable and maintainable.
The disconnect is installed in the immediate vicinity
The gray box visible on the wall is the outdoor disconnect.
It allows the unit to be isolated for certain maintenance or repair operations. Its proximity to the heat pump is convenient, and the wiring remains grouped against the façade rather than forming an unnecessarily long route.
For this type of project, we always coordinate the HVAC work and the electrical requirements so that the entire system is coherent.
A central heat pump does not compensate for improper sizing
The most important consideration for a homeowner shopping for a MIDEA EVOX G3 in Montreal, Laval, Longueuil, on the North Shore, or on the South Shore remains sizing.
Installing the largest available heat pump is not a solution.
An oversized unit can shorten cycle times, hinder summer dehumidification, and complicate the balance between rooms. Conversely, an undersized unit can place excessive demands on auxiliary heating during cold periods.
We must therefore consider the area, but also the insulation, windows, orientation, air infiltration, duct distribution, and actual heat losses.
This is also why we do not claim the exact tonnage of the photographed machine based solely on its outdoor casing.
LogisVert: eligibility must be confirmed with the exact AHRI number
For Quebec homeowners, the question of the LogisVert subsidy for a central heat pump is obviously important.
Hydro-Québec states that, for a heat pump installed on or after November 26, 2025, the model must be ENERGY STAR certified to qualify for the financial assistance applicable to efficient heat pumps. The list of models and the amount granted may change; Hydro-Québec therefore recommends checking the equipment based on its installation date and, ideally, its AHRI number.
The application must currently be submitted within nine months of the installation date.
The EVOX G3 brochure, for its part, indicates that the range meets the ENERGY STAR Most Efficient criteria presented by MIDEA. However, for a LogisVert application, we always verify the exact pairing of the outdoor unit and indoor unit, because this pairing and its AHRI determine actual eligibility and the associated amount.
For this project in Saint-Cyprien-de-Napierville, the photograph alone does not make it possible to read the complete model of the outdoor unit. It would therefore be incorrect to invent a subsidy amount simply because we know it is an EVOX G3.
The details that make for a better central installation
When we install a central heat pump, our work is not limited to connecting two copper pipes and powering on the equipment.
We must validate airflow, static pressure, filtration, drainage, auxiliary heating operation, thermostat communication, supply-air temperatures, the refrigeration circuit, and the system’s behaviour in its various modes.
The EVOX G3 offers a great deal of technology. But the installation must allow that technology to operate properly.
This Saint-Cyprien-de-Napierville project provides a particularly clear illustration: the outdoor unit is elevated, stable, clear at the front, and accessible from the service side. The connections are short and grouped together. The disconnect switch is located directly nearby. The equipment was not left at ground level between the foundation and the plantings.
These are simple decisions to recognize in hindsight, but they require careful planning before even taking out the tools.
What we take away from this MIDEA EVOX G3 installation
For homeowners considering replacing an electric furnace, an older central heat pump, or a conventional air conditioning system, the MIDEA EVOX G3 deserves to be evaluated according to several criteria simultaneously: cold-weather performance, energy efficiency, modulation capacity, compatibility with the existing ductwork, and control options.
Technically, the range brings together several interesting features: operation rated down to -30 °C, inverter technology, R-454B refrigerant, adaptive constant-airflow blower, 24 V or communicating compatibility, MERV 13 filtration, and modular indoor design.
From an installation standpoint, the Saint-Cyprien-de-Napierville project above all demonstrates that high-performance equipment deserves an equally serious installation.
At AirGreen, this is precisely the combination we seek in our heating, ventilation, and air conditioning projects: selecting the right equipment, then adapting its installation to the home rather than forcing the home to adapt to the equipment.
Whether the project is located in Saint-Cyprien-de-Napierville, Montréal, Laval, Longueuil, on the South Shore, or on the North Shore, we place the same importance on sizing, connection quality, airflow, and future accessibility for HVAC maintenance.