A compact outdoor installation on a brick wall, designed with drainage, snow, and service access in mind
In Vaudreuil-Dorion, this installation of a MIDEA EVOX G3 central heat pump illustrates a type of project we regularly encounter at AirGreen: an existing house where the new equipment must be integrated cleanly into a façade already occupied by a downspout, an electrical service entrance, refrigerant line routing, and exterior landscaping.
The project photo shows a particularly revealing installation. The MIDEA outdoor unit is positioned against a brick wall and installed on elevated metal brackets. The large front fan is oriented toward the yard, where there is ample clearance. The refrigerant and electrical lines are grouped on the service side and protected by a light-colored line-set cover that runs vertically along the building. The electrical disconnect remains easily accessible to the right of the unit.
These are simple details to look at once the project is complete, but each one addresses a specific constraint of the HVAC installation.
A location where several building elements meet
The side of this residence was not a completely blank wall.
We had to work around the masonry, an existing vertical duct, the electrical connections, and the location where the system's lines pass into the house.
In this type of situation, the worst approach is to install the heat pump first and then try to route everything else afterward.
We proceed in the reverse order: we consider the entire route before determining the final position.
The following must be planned:
- the space occupied by the outdoor unit;
- the fan's air discharge;
- access to the service panels;
- the route of the refrigerant lines;
- electrical connection;
- water drainage;
- winter clearance;
- and the visual integration with the façade.
On this project in Vaudreuil-Dorion, the result is compact without enclosing the heat pump in a difficult-to-access space.
Why install the EVOX G3 above ground level
The photo clearly shows that the unit does not rest directly on the pavers or the ground.
We used a metal structure that keeps the unit at a suitable height.
For a central heat pump intended for the Quebec climate, this height is particularly important for heating.
During winter operation, the outdoor heat exchanger may accumulate frost. The unit then runs defrost cycles, producing water beneath the heat pump. When temperatures are below freezing, this water can then freeze.
A unit installed too low may therefore gradually become surrounded by ice.
The elevation provides more space for:
- snow accumulation;
- water produced during defrosting;
- access beneath the unit;
- air circulation;
- and future maintenance.
In Vaudreuil-Dorion, where heavy snowfall and freezing are normal during winter, this is a functional choice, not merely an aesthetic one.
The pavers visible beneath the unit do not support the heat pump
An interesting detail appears at the bottom of the photo: several concrete slabs are stacked near the outdoor unit.
However, the heat pump does not rest on these pavers. Its weight is supported by the metal structure attached to the building.
This distinction is important because a base made of slabs placed directly on soil that may shift with freezing and thawing can eventually move or lose its level.
In a heat pump installation, the support must remain stable.
A horizontal discharge particularly well suited to this type of side of the house
The MIDEA EVOX G3 uses a large front fan and a horizontal discharge design.
MIDEA's documentation explains that its outdoor unit combines a horizontal fan with a vertical heat exchanger to provide more uniform airflow across the heat exchanger's surface, particularly when outdoor temperatures drop.
In this installation, the fan faces directly toward the open part of the property.
That is exactly what we want.
However, the owner will need to keep this area clear in the future. A shed, solid fence, storage bin, or very closely spaced shrubs can reduce airflow or promote recirculation.
The line-set cover is part of the project's visual quality
A central heat pump installation necessarily has technical components visible outdoors.
That does not mean they have to be messy.
In this installation, the lines are grouped near the heat pump before rising into a light-colored vertical line-set cover. Its color matches the home's existing elements, creating a much cleaner visual transition than tubes and cables directly exposed on the brick wall.
We aim, whenever possible, to achieve a logical, straight, and accessible route.
An attractive line-set cover does not improve a heat pump's SEER2, but it contributes greatly to the perceived quality of an installation that will remain visible for many years.
An accessible service side
To the right of the unit, the service panels remain accessible.
The electrical disconnect is also placed nearby.
This is important because future service work will take place precisely on this side: electrical checks, valve access, refrigeration diagnostics, and component inspection.
A heat pump that works perfectly today must still be serviceable ten years from now.
At AirGreen, we therefore avoid placing the service side against a fence, structure, or permanent obstruction simply to save a few inches during installation.
The MIDEA EVOX G3 and very-low-temperature heating
For a residence in Vaudreuil-Dorion, summer cooling represents only part of the system's use.
Winter heating capacity is just as important.
MIDEA presents the EVOX G3 Extreme Heat as a platform capable of continuing to operate down to -30 °C. The manufacturer also indicates up to 100% of the heating capacity at -25 °C under the conditions presented, with a COP of up to 1.9.
However, it is important to understand what this really means.
A minimum operating temperature is not the same as a guaranteed identical heating capacity for all models.
The available BTU output depends on the exact capacity of the outdoor unit, the indoor-outdoor match, and the operating conditions.
Interesting tests at -15 °C and -25 °C
MIDEA documentation also presents results obtained with a 3-ton EVOX system.
In this test, the manufacturer indicates a COP of up to 2.4 at approximately -15 °C. At approximately -25 °C, MIDEA reports up to 118% of the rated heating capacity with a COP of 1.92 for the system tested. The brochure explicitly states that these figures are based on a 3-ton system.
This distinction is important to us.
We do not turn performance achieved on a 3-ton system into a promise that automatically applies to a 2-, 4-, or 5-ton heat pump.
The actual match must always be verified.
A range of several capacities, not a single model
The photo clearly identifies the MIDEA EVOX G3 family, but the complete number shown on the rating plate is not legible enough for us to state with certainty the tonnage of this Vaudreuil-Dorion installation.
We therefore prefer not to make it up.
MIDEA documentation lists several EVOX G3 configurations, including nominal cooling capacities of 18,000, 24,000, 30,000, 36,000, 48,000, and 54,000 BTU/h.
The choice among these capacities should be based on the home’s needs.
Energy performance varies with capacity
Depending on the configuration, the EVOX G3 family can reach up to 19 SEER2, 12.5 EER2, and 10.8 HSPF2, as well as a COP of up to 2.14 at approximately -15 °C for the corresponding match.
MIDEA’s technical table clearly shows that the values change from one capacity to another.
For example, the 30,000 BTU/h configuration is listed at 17.2 SEER2, the 36,000 BTU/h configuration at 17.7 SEER2, and the 48,000 BTU/h configuration at 17.5 SEER2.
For a homeowner comparing two quotes, the right question is therefore not just: “Is it an EVOX G3?”
You should also ask:
What is the outdoor model? What is the indoor model? What is the certified capacity? What is the exact match?
The outdoor unit is only the visible part: the quality of a central heat pump depends on the entire indoor system
Airflow is just as important as the refrigeration circuit
Unlike a wall-mounted heat pump, a central heat pump must distribute its heating and cooling through a duct system.
This means that an excellent outdoor unit cannot fully compensate for a poor air distribution system.
If the return is too small, the filter is too restrictive, or certain ducts are undersized, system performance may suffer.
MIDEA has integrated its Computational Constant Airflow 2.0 technology into the EVOX G3, designed to adjust fan speed and output according to system conditions. The documentation illustrates operation at up to 1.2 in. of water column static pressure in the scenarios presented and up to 60 airflow adjustment levels.
This technology offers interesting flexibility, particularly in existing homes in Vaudreuil-Dorion.
However, it does not replace a properly sized duct system.
An indoor architecture with M-Coil and a symmetrical fan
MIDEA also uses an indoor M-Coil design paired with a symmetrical fan.
According to the manufacturer, this architecture greatly reduces airflow differences between the different sections of the heat exchanger compared with a conventional design.
For us, this means that the equipment provides a solid technical foundation, but we still need to integrate it properly into the home's air distribution system.
A modular indoor unit when the mechanical room is difficult
The EVOX G3 platform uses a design called Block N Lock.
MIDEA presents up to six installation configurations, including vertical upflow and downflow positions, right- and left-horizontal positions, as well as different low-height arrangements.
This flexibility is particularly useful when replacing an old furnace.
In the basements of Vaudreuil-Dorion, Hudson, Saint-Lazare, Montreal, Laval or Longueuil, mechanical space is rarely completely clear. We often have to work around beams, plumbing lines, water heaters or existing ducts.
A modular unit can sometimes allow much of the existing installation to be retained while improving integration of the new system.
Dimensions designed for certain furnace replacements
MIDEA indicates indoor unit widths ranging from 14.5 to 21.5 inches, depending on capacity, with the goal of matching several dimensions of existing residential furnaces.
The platform also provides a multivoltage indoor power supply of 115 V or 208/230 V, depending on the configuration.
These are useful features for a conversion project to a central Inverter heat pump, but each job must still be verified on site.
R-454B: the refrigerant used in this EVOX G3 generation
MIDEA documentation indicates that the EVOX central line uses R-454B refrigerant, an A2L refrigerant with an announced global warming potential of 466.
This development modifies certain service and installation practices.
For the homeowner, the refrigerant remains in a closed circuit and does not require any special intervention.
For the HVAC contractor, however, the appropriate procedures and equipment must be used for this new generation of systems.
Auxiliary heating that must be sized intelligently
The EVOX G3 brochure also provides for multi-stage auxiliary heating kits capable of reaching 25 kW, depending on the configuration.
In Quebec, this supplemental heating can play an important role during certain cold snaps.
But the goal is not to operate the electric resistance heaters as soon as the outdoor temperature drops below freezing.
Proper programming should allow the Inverter heat pump to cover the load for as long as it can do so efficiently, then use auxiliary heating when the home's needs genuinely require it.
Communicating thermostat or traditional 24 V control
The EVOX G3 platform can use 485 communication or operate with a conventional 24 V control, depending on the configuration. MIDEA also presents various integration possibilities with its equipment or certain third-party devices.
The MIDEA communicating thermostat and the SmartHome app can also offer scheduling, comfort management, certain diagnostic functions, and consumption monitoring.
We choose the type of control based on the project rather than assuming that one thermostat suits every installation.
LogisVert: what a homeowner in Vaudreuil-Dorion really needs to verify
For an installation completed today in Quebec, Hydro-Québec requires heat pumps installed since November 26, 2025, to be ENERGY STAR certified to qualify for the LogisVert Heat Pump measure. The complete system must include, among other things, the eligible outdoor and indoor units.
At present, the residential financial assistance indicated by Hydro-Québec is $50 per 1,000 BTU/h of capacity at -8 °C for an ENERGY STAR heat pump, and $120 per 1,000 BTU/h at -8 °C when it is ENERGY STAR - Cold Climate certified, subject to all program conditions.
The amount is therefore not calculated directly from the nominal “tonnage” shown on the quotation.
It depends on the recognized capacity at -8 °C of the specific combination.
That is why we emphasize the indoor and outdoor model numbers: the name “MIDEA EVOX G3” alone is not enough to determine the exact amount of a rebate.
The mistakes we seek to avoid on this type of project
An installation like the one in Vaudreuil-Dorion may seem very simple once completed, but several mistakes can compromise the result:
- Installing the unit too close to the ground, reducing clearance from snow and ice.
- Obstructing the front fan with a fence or landscaping.
- Making service panels inaccessible to save a few inches.
- Neglecting ductwork sizing because the heat pump is Inverter.
- Choosing the tonnage based solely on the home's square footage.
- Confusing the product line name with a specific certified match, particularly for efficiency ratings and rebates.
- Neglecting the auxiliary heating and its programming, which can unnecessarily increase electricity consumption.
At AirGreen, we prefer to address these questions during the project design rather than after commissioning.
A clean installation that remains technically sound
This MIDEA EVOX G3 central heat pump project in Vaudreuil-Dorion clearly demonstrates our approach to residential installation.
The outdoor unit is elevated. The fan has plenty of clearance in front of it. The lines are grouped in a line-hide that follows the façade cleanly. The disconnect switch remains accessible. The service side can still be opened and inspected. The unit does not rest on the pavers visible on the ground, but on a dedicated structure.
It is this combination of technical performance and workmanship that we strive for.
A central heat pump is an investment for many years. It must therefore operate properly on its first day of cooling, but also during cold January nights, after several defrost cycles, and during future maintenance.
We install MIDEA EVOX G3 central heat pumps in Vaudreuil-Dorion, Hudson, Saint-Lazare, Rigaud, and throughout Vaudreuil-Soulanges, as well as in Montreal, Laval, Longueuil, on the South Shore and the North Shore.
For a furnace or older central heat pump replacement, we analyze the system as a whole: heating capacity, ductwork, airflow, filtration, electrical supply, auxiliary heating, outdoor location, and eligibility for financial assistance programs.