Installation of a MIDEA EVOX G3 central heat pump in Rivière-des-Prairies–Pointe-aux-Trembles, Montreal
In Rivière-des-Prairies–Pointe-aux-Trembles, AirGreen installs a MIDEA EVOX G3 central heat pump on an elevated structure, with a short refrigerant line run, inverter technology, and a design adapted to Montreal’s climate.
Take a tour of the installation
Each number is a point we check on site. Switch between summer and winter to watch air and heat move.
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.
An elevated central installation with direct connection through a masonry wall
At Rivière-des-Prairies–Pointe-aux-Trembles, we completed this MIDEA EVOX G3 central heat pump installation at a residence where the outdoor location allowed for particularly efficient integration: a clear masonry wall, a grassed area in front of the unit, and the possibility of creating a very short refrigerant line route into the building.
The project photograph highlights a configuration we appreciate whenever it is possible. The outdoor unit is installed on an elevated metal structure, high enough to avoid direct contact with the ground and to leave generous clearance beneath the machine. The refrigerant lines exit the heat pump's service side and enter the building almost immediately, through an opening carefully positioned behind the unit.
This significantly reduces the amount of piping exposed outdoors.
For a central system, this detail is much more important than it may appear. The less we need to run the lines along the facade for several metres, the easier it is to protect the insulation, maintain a clean appearance, and simplify future HVAC service work.
The MIDEA EVOX G3 is part of the range of inverter ducted central systems developed by MIDEA for forced-air heating and cooling projects. The manufacturer's documentation positions it in particular as a modernization solution for residential central systems.
What makes this installation different: an almost minimal exterior route
On several central heat pump installations, we have to go around windows, decks, downspouts, soffits, or even several corners of the building before reaching the mechanical room.
Here, the situation was much more favorable.
The technical side of the EVOX G3 is located directly near the wall penetration point. The insulated lines leave the service compartment, make a short bend, then enter the house.
This layout offers several advantages:
- less visible piping;
- less insulation exposed to UV rays and the elements;
- reduced number of exterior elbows;
- easier access to connections;
- more discreet visual appearance;
- easier-to-inspect refrigerant path.
In the photo, we can also clearly see the two insulated lines and the control wires grouped at the building entrance.
The brick wall and the lower part of the foundation thus form a compact service area around the unit.
A support raised above the grass rather than an installation directly on the ground
The heat pump does not rest on the ground.
It is supported by a sturdy metal structure, consisting of crossbars and vertical posts, which keeps the condenser well above the lawn.
In Montreal's climate, this height is particularly useful.
A central heat pump used for heating in winter must continue operating even when there is snow on the ground. A unit installed too low can end up surrounded by buildup after a storm or after several snow-clearing operations.
The clearance beneath this EVOX G3 helps reduce this risk.
It also leaves enough space for the water produced during defrost cycles.
Why does a heat pump produce water in winter?
In heating mode, the outdoor heat exchanger becomes cold and can accumulate frost.
The system must then periodically perform a defrost cycle to remove this ice. During this cycle, the frost melts and becomes water.
When this water reaches ground that is already frozen, it can obviously freeze again.
A unit that is too low can gradually end up above a block of ice rising toward its base.
This is precisely why, at AirGreen, we pay close attention to the installation height of heat pumps in Montreal, Laval, Longueuil, the North Shore, and the South Shore.
The structure visible here creates good physical separation between the unit and the ground.
A large, completely open ventilation panel
The front of the outdoor unit is dominated by the large axial fan.
The EVOX G3 uses a horizontal discharge design. According to MIDEA, the combination of a horizontal fan and a vertical heat exchanger is intended to provide more even airflow across the heat exchanger surface and maintain efficient heat exchange as outdoor temperatures become colder.
In this installation in Rivière-des-Prairies–Pointe-aux-Trembles, the front of the unit faces directly toward an open, grassy area.
There is no fence pressed against the grille, no wall in front of the fan, and no large shrub obstructing the air outlet.
This is exactly what we are looking for.
A heat pump must move a large amount of air through its heat exchanger. An obstacle that is too close can promote recirculation of discharged air and reduce performance.
The service panel remains accessible
The right side of the heat pump is particularly visible in the photo.
We can see the nameplates, the connection compartment, and the refrigerant lines.
This illustrates another important principle: never sacrifice technical access solely to hide the machine.
A technician may eventually need to access these components to:
- check the connections;
- take certain measurements;
- perform a diagnostic;
- inspect the refrigeration circuit;
- replace a component;
- perform maintenance.
The unit must therefore be sufficiently far from permanent obstacles.
An EVOX G3 designed for Quebec’s low temperatures
For an installation in Rivière-des-Prairies–Pointe-aux-Trembles, cold-weather performance is one of the most important criteria.
MIDEA states that this Extreme Heat range can operate continuously down to -30 °C. In its documentation, the manufacturer also presents tests on a three-ton system showing up to 100% heating capacity at around -25 °C, with a COP of approximately 1.9 under these test conditions.
However, this data must be interpreted correctly.
An operating limit of -30 °C does not mean that all EVOX G3 units deliver exactly their rated capacity at that temperature.
Performance varies in particular according to:
- system capacity;
- outdoor model;
- indoor unit;
- temperature;
- airflow;
- and the building’s heating load.
We therefore always verify the exact installed combination before announcing a precise capacity at low temperatures.
M-Powevi: the technology used to support heating in extreme cold
MIDEA also features its M-Powevi compressor technology.
In very cold conditions, the system uses intermediate-temperature vapor injection to increase the amount of compressed refrigerant and boost heating capacity. The manufacturer also mentions a high-efficiency compressor motor and an optimized discharge path.
This type of architecture is particularly interesting for our market.
In Montreal, we do not simply want a heat pump to operate in October and April. We are looking for a system capable of continuing to provide a useful contribution to heating during a much larger portion of the winter.
What exact capacity did we install on this project?
The photo clearly shows the MIDEA unit and its side nameplate, but the text on the plate is not legible enough to reliably confirm the complete model number.
We therefore do not want to artificially assign a tonnage to this installation.
The EVOX G3 brochure presents several system capacities, including:
- 18,000 BTU/h;
- 24,000 BTU/h;
- 30,000 BTU/h;
- 36,000 BTU/h;
- 48,000 BTU/h;
- 54,000 BTU/h in nominal cooling capacity depending on the different pairings.
The listed model combinations include, among others, MAUSE indoor units paired with MO1HE outdoor units.
To correctly identify a system, we therefore use the outdoor model + indoor model + applicable performance reference, rather than the apparent size of the cabinet.
SEER2, EER2, and HSPF2: figures vary according to capacity
The EVOX G3 series can reach up to 19 SEER2, 12.5 EER2, 10.8 HSPF2, and a COP at 5 °F of up to 2.14.
However, the actual values vary according to capacity.
The MIDEA data sheet indicates, for example:
- 18,000 BTU: 19 SEER2 / 12.5 EER2 / 10.1 HSPF2;
- 24,000 BTU: 18.6 SEER2 / 12 EER2 / 10 HSPF2;
- 30,000 BTU: 17.2 SEER2 / 12 EER2 / 10.8 HSPF2;
- 36,000 BTU: 17.7 SEER2 / 12 EER2 / 10 HSPF2;
- 48,000 BTU: 17.5 SEER2 / 12 EER2 / 9.5 HSPF2.
This difference is important when a homeowner compares multiple quotes.
A quote that only states “EVOX G3 up to 19 SEER2” does not necessarily indicate the performance of the proposed system.
The exact pairing must be known.
Why the largest system is not necessarily the best
In HVAC, oversizing a unit is not a reliable way to improve comfort.
An oversized central heat pump can shorten cooling cycles and impair dehumidification.
A unit that is too small may, in turn, use auxiliary heating more quickly during the coldest periods.
To properly size a system in Rivière-des-Prairies–Pointe-aux-Trembles, we consider, among other factors:
- the actual heated area;
- insulation;
- windows;
- airtightness;
- heat losses;
- sun exposure;
- the basement;
- the capacity of the duct network;
- air returns.
The number of square feet is only part of the equation.
Behind the outdoor unit: the EVOX G3 must also work well with the home's existing ductwork
The air handler is an essential component
The photograph shows the outdoor condenser, but a MIDEA EVOX G3 central heat pump operates with an indoor unit that distributes air throughout the residence.
An excellent outdoor unit cannot compensate for a poor duct network.
If airflow is insufficient, several problems can arise:
- rooms that are difficult to heat;
- uneven temperature;
- air noise;
- excessive static pressure;
- reduced performance;
- less comfortable cycles.
We therefore place as much importance on airflow as on the refrigeration circuit.
Computational Constant Airflow 2.0
MIDEA equips this generation with Computational Constant Airflow 2.0 technology.
According to the manufacturer, the system can adjust the motor's output and speed when the system's static pressure changes.
The documentation indicates a capacity of approximately 1.2 in. of water column static pressure, as well as an airflow setting offering up to 60 levels.
MIDEA also specifies that this control can respond to certain variations caused by ductwork, more restrictive filters, or certain obstructions.
This gives installers plenty of room for adjustment.
However, technology does not replace a properly designed duct system.
A modular air handler for existing homes
The EVOX G3 was also designed to offer several indoor installation options.
MIDEA offers configurations in:
- upflow;
- downflow;
- right horizontal;
- left horizontal;
- and low-boy applications.
This flexibility can be very useful in existing Montreal homes, where mechanical rooms are not always spacious.
The manufacturer also offers different indoor unit widths, approximately from 14.5 to 21.5 inches, and a multivoltage architecture that can accept 115 V or 208/230 V depending on the configuration.
Auxiliary heating up to 25 kW depending on the configuration
The range also includes three-stage auxiliary electric heating of up to 25 kW, depending on the equipment selected.
This auxiliary heating may be necessary when the home's heating load exceeds the heat pump's available capacity.
The goal, however, remains to allow the inverter to provide as much of the heating as possible when conditions permit.
24 V thermostat or advanced communication
The documentation indicates that the EVOX G3 can operate with 485 communication or with a traditional 24 V thermostat.
MIDEA also describes Sub-1 GHz wireless communication between certain system components.
For a renovation, this compatibility can be particularly useful.
We can sometimes modernize the equipment without having to open several walls just to replace the thermostat wire.
MERV 13 filtration: up to 4 inches
MIDEA provides a module compatible with 1-, 2-, or 4-inch MERV 13 filters.
According to the documentation, this filtration can help retain more dust, pollen, particles, and pet dander or hair while keeping the indoor coil cleaner.
However, we must always check the static pressure before using more restrictive filtration.
A good filter should improve air quality without suffocating the blower.
R-454B: a new generation of refrigerant
The EVOX G3 uses R-454B, an A2L-classified refrigerant.
MIDEA indicates a global warming potential of 466 and specifies that R-454B was chosen for this new equipment family.
For us, using R-454B also means following the proper procedures for connection, leak testing, evacuation, and commissioning.
The refrigerant differs from previous generations, but the need for precision remains the same.
A detail visible in the photo: the wall penetration very close to the unit
On this installation, the pipe entry point is only a short distance from the service side.
This configuration avoids a long outdoor line-hide.
The passage through the wall must obviously be properly protected and sealed to limit water and air infiltration.
This is a detail we consider important, especially when it involves a masonry wall.
A good installation is not solely about hiding the piping.
The penetration itself must be durable.
A nearby outdoor vent: carefully plan clearances
We can also see a small wall vent above and to the left of the outdoor unit.
During an installation, the openings on the facade must be identified before choosing the condenser's final location.
Depending on their function, they may impose specific constraints.
We therefore always check the entire surroundings before securing the structure.
A structure that keeps the ground available
Another visible advantage is that the ground remains essentially clear beneath the unit.
The owner can maintain the grass around the support and remove debris without having to work around a large concrete slab occupying the entire area.
You simply need to keep the space beneath the unit clear of stored materials.
The area is necessary for winter drainage and technical access.
ENERGY STAR and eligibility for assistance programs
MIDEA documentation indicates that the range presented exceeds the ENERGY STAR Most Efficient criteria mentioned for this category of systems.
However, this does not allow us to confirm a specific subsidy amount for this Rivière-des-Prairies–Pointe-aux-Trembles installation based on the photo and brochure alone.
To determine whether a system is actually eligible for financial assistance, you must verify the exact indoor-outdoor match, its AHRI identification, and the program criteria applicable on the installation date.
We always prefer this verification to a promise based solely on the name “EVOX G3.”
Mistakes this installation helps avoid
This installation illustrates several best practices for a central heat pump in Montréal.
Avoid placing the machine directly on the grass.
An elevated support is much better suited to snow accumulation and defrost cycles.
Do not create an unnecessarily long refrigerant route.
Here, the entry point into the building is located very close to the unit.
Preserve the service side.
The connections must remain accessible throughout the machine's service life.
Let the fan side breathe.
A horizontal discharge needs open space.
Never choose the BTU rating based solely on the condenser dimensions.
The model plate and the matched system are the true references.
Do not neglect the ductwork.
The performance of a central heat pump also depends on air distribution.
Plan for winter from the summer installation onward.
Snow and defrost water must be considered before the first start-up.
Why this project represents our approach at AirGreen
This Rivière-des-Prairies–Pointe-aux-Trembles project is a good example of an installation where a simple route becomes a genuine advantage.
The outdoor unit is elevated, its fan has ample clearance, the service side remains accessible, and the refrigerant lines reach the building quickly.
This allows us to avoid multiplying the number of visible elements on the facade.
The MIDEA EVOX G3 adds its inverter technology, low-temperature operation, R-454B, a modular indoor unit, various control methods, and a blower designed to adapt to the characteristics of the ductwork.
But at AirGreen, we always consider equipment quality and installation quality to be inseparable.
Whether we work in Rivière-des-Prairies–Pointe-aux-Trembles, Montréal, Laval, Longueuil, on the North Shore or the South Shore, our objective is the same: to design an HVAC installation that works well today, remains affordable tomorrow, and is truly suited to Quebec winters.
The unit on this job, in figures
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.
The big day, step by step
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 would it look like 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.
Four mistakes we do not make
Flip each card to see what we do instead.
Your own project, step by step
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.
Is your home ready?
Check what applies at your place. A "no" is not a refusal: it is what we sort out during the estimate.
Four statements: true or false?
It all comes down to details you have just seen.
1. A central heat pump uses the house's ducts.
It connects to the existing ducts to heat and cool everywhere.
2. In extreme cold, electric backup heat can take over.
The indoor module (furnace or air handler) works with the heat pump and takes over in extreme cold.
3. The filter only gets changed when the unit breaks down.
A dirty filter cuts airflow. It gets checked regularly.
4. You can reuse the old unit's size without checking.
The house may have changed: insulation, windows, added rooms. Capacity is confirmed on site.
0 / 4 right answers
What people ask us about this kind of work
Can I keep my current ducts?
What happens in extreme cold?
Furnace, air handler, ducted: what is the difference?
Are there grants?
Do I need a permit?
How much can I save?
How is the LogisVert assistance calculated?
Will my current thermostat work?
Central or wall units: which one?
Does AirGreen hold the required licences?
Is the estimate free?
No question matches. Write to us: we answer.
More jobs to see, near you
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Each dot: a town where AirGreen has published projects. The glowing dot: this job.
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The on-site estimate is free and the quote follows within 24 hours.
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).