Installation of a MIDEA EVOX G3 central heat pump in Napierville, Montérégie
MIDEA EVOX G3 central heat pump installed in Napierville: elevated unit, Inverter technology, heating down to -30 °C, R-454B, and professional HVAC integration by AirGreen.
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.
A central installation designed for Napierville’s climate, with a raised EVOX G3 outdoor unit carefully integrated into the property
At Napierville, this installation of a MIDEA EVOX G3 central heat pump perfectly demonstrates what we look for at AirGreen when an HVAC system must perform in winter, remain accessible for maintenance and integrate neatly into the exterior of a home.
The project photo reveals several significant details. Unlike a traditional cube-shaped central heat pump that discharges air upward, the MIDEA EVOX G3 uses a horizontal-discharge design. The outdoor unit is much closer in its architecture to a large-capacity wall-mounted condenser: a large front fan expels air horizontally, while the heat exchanger occupies a substantial part of the unit’s sides.
For this Napierville residence, we installed the outdoor unit on metal wall brackets, well above the ground. The refrigerant lines follow the foundation and are protected by a white exterior finish. The electrical disconnect is installed in the immediate vicinity of the heat pump while remaining separate and accessible.
This type of installation seems simple once completed. However, the decisions made before securing the first bracket have a direct impact on winter performance, vibrations, service access and the installation’s lifespan.
Why the horizontal format of the MIDEA EVOX G3 is well suited to certain homes in Napierville
The available space alongside a house is often limited. This can be particularly important in residential areas of Napierville, Saint-Cyprien-de-Napierville, Saint-Rémi and the South Shore, where a central heat pump may sometimes have to coexist with a patio, a basement window, a downspout, a passage to the yard or other mechanical equipment.
MIDEA documentation clearly presents the EVOX G3 with a horizontal-discharge outdoor unit and a heat exchanger designed to promote uniform airflow. The manufacturer associates this architecture with improved heat-exchange efficiency as temperatures drop.
In this installation, the unit's size also makes it possible to place it relatively close to the building without taking up a large amount of ground space.
However, the goal is never to bring a heat pump as close to the wall as possible. The clearances required by the manufacturer for air intake, air discharge, and access to the service panels must always be maintained.
Raising the heat pump: a particularly important detail in Quebec
One of the most visible features of this Napierville installation is the height of the outdoor unit.
We used a metal structure attached to the building rather than placing the heat pump directly on a small slab at ground level. For a heat pump expected to operate during Quebec winters, this decision is particularly relevant.
In heating mode, the outdoor heat exchanger becomes cold. Frost can form on it, and the machine must periodically run a defrost cycle. The water produced during this process falls beneath the unit. At below-freezing temperatures, it can then freeze.
Keeping the heat pump above the ground therefore helps limit several problems related to snow and ice buildup.
We are looking for, among other things:
- sufficient clearance beneath the outdoor unit for winter conditions;
- a mounting system capable of properly supporting the weight and mechanical stresses;
- a perfectly level unit;
- airflow that is not obstructed by snow or vegetation;
- enough space for a technician to service it later;
- a logical route for the refrigerant piping and electrical supply.
These are details that matter much more after several winters than when the installation is being photographed.
A central heat pump designed to operate down to -30 °C
For an installation in Napierville, cold-weather performance is obviously not a minor consideration.
MIDEA indicates that the EVOX G3 offers continuous operation down to -30 °C. The documentation also states that it can deliver up to 100% of its heating capacity at -25 °C, with a COP of up to 1.9 depending on the configuration and test conditions.
The brochure also provides test results for a 3-ton MIDEA system as part of its presentation on cold-climate heat pumps. At approximately -15 °C, it reports a COP of 2.4, while at approximately -25 °C, it reports 118% of the nominal heating capacity with a COP of 1.92 for the tested system. MIDEA specifies that these results are based on a 3-ton system; they should therefore not be automatically applied to every EVOX G3 capacity.
This distinction is important.
When a homeowner compares several central heat pumps in Quebec, it is not enough to read “operates at -30 °C.” We must also look at how many BTUs the unit can actually deliver as the temperature drops, its COP at low temperatures and how the auxiliary heat source is controlled.
SEER2, HSPF2 and capacity: the figures change according to tonnage
The MIDEA EVOX G3 family includes several capacities. The technical brochure presents configurations ranging from 18,000 to 54,000 BTU/h in cooling, with performance varying according to the match-up.
For example, MIDEA's official table lists a 30,000 BTU/h configuration with a SEER2 of 17.2 and an HSPF2 of 10.8, a 36,000 BTU/h configuration at 17.7 SEER2 and 10.0 HSPF2, and a 48,000 BTU/h configuration at 17.5 SEER2 and 9.5 HSPF2.
According to MIDEA, the range reaches up to 19 SEER2, 12.5 EER2, 10.8 HSPF2 and a COP of 2.14 at 5 °F, or approximately -15 °C, depending on the model.
For a real installation like this, however, we never choose the tonnage simply because a larger model offers more BTUs.
A central heat pump must be matched to the building's load and the ductwork's capacity. Oversizing can shorten operating cycles, impair summer dehumidification and generate unnecessarily high airflow. An undersized system, on the other hand, may rely too frequently on auxiliary heating during cold periods.
The ductwork is part of the heat pump
A fundamental difference between this installation and a ductless wall-mounted heat pump is that comfort depends heavily on the home's ductwork.
A central heat pump can have excellent performance on an AHRI rating sheet and still deliver disappointing results if the actual airflow is not properly adjusted.
That is precisely one of the interesting aspects of the EVOX G3.
MIDEA incorporates its Computational Constant Airflow 2.0 technology, designed to adapt fan operation to the conditions of the ductwork and filtration system. The documentation indicates an ability to maintain airflow under conditions of up to 1.2 in. of water column static pressure and mentions up to 60 air-volume adjustment levels.
For us, this technology does not replace good ductwork design. Rather, it offers valuable flexibility when a central heat pump is installed in an existing home.
Why this aspect is particularly interesting when replacing a central system
Many homes in Montérégie and Greater Montreal already have ductwork designed for an electric or gas furnace.
When a homeowner wants to switch to an Inverter central heat pump, the question is therefore not simply: “which heat pump should I buy?”
We must also examine the return-air dimensions, supply ducts, filtration, dampers, static pressure, and the airflow required by the new indoor unit.
The EVOX G3 was specifically developed with an architecture intended to facilitate certain modernization projects. MIDEA documentation mentions an indoor unit available in widths matching those of several existing furnaces, as well as a voltage adaptation of 115 V or 208/230 V depending on the configuration.
This can reduce certain constraints in mechanical rooms where every available inch matters.
A modular indoor unit for difficult basements and mechanical spaces
The photo of this installation shows us only the exterior portion of the project. The other half of the central system is obviously inside the house.
The EVOX G3's design is interesting in this regard because MIDEA uses a modular architecture called Block N Lock. The manufacturer presents six possible installation orientations, including upward discharge, downward discharge, left horizontal, right horizontal, and certain low-clearance configurations.
This is not a theoretical argument for an HVAC installer.
In basements in Napierville, Longueuil, Laval, or Montreal, we regularly encounter low ceilings, beams, existing ducts, and mechanical spaces where work must be done with very precise dimensions.
An indoor unit that offers several orientation options makes it easier to achieve a clean installation without unnecessarily reconfiguring the entire ductwork system.
R-454B: the refrigerant used by the new EVOX G3 generation
The new EVOX G3 family presented in MIDEA documentation uses R-454B refrigerant.
It is an A2L refrigerant with low flammability and a significantly lower global warming potential than several refrigerants used previously. MIDEA indicates a GWP of 466 for the R-454B used in its product line.
The arrival of R-454B changes certain installation and service practices. Refrigerant handling tools, procedures, and methods must be adapted to the product.
For the homeowner, this mainly means that it is even more important to entrust the installation and maintenance to an HVAC company that regularly works with this new generation of equipment.
What the photo reveals about the project's finishing quality
Several details of this Napierville installation deserve examination.
The supports are aligned, and the unit is clearly raised off the ground. The refrigerant piping is grouped together and protected along the foundation rather than left exposed in the passageway. The cable and electrical supply have their own routing. The disconnect remains accessible on the wall to the left of the unit.
The outdoor unit also has open space in front of its large fan. This is essential with a side-discharge heat pump: placing an obstacle immediately in front of the fan could promote air recirculation and impair operation.
We also consider access to the sides of the unit, because an installation must remain serviceable after five, ten, or fifteen years.
A common mistake: choosing the location based solely on line length
The shortest path between the indoor unit and the outdoor unit is not always the best location.
We also assess snow, drainage, windows, ventilation outlets, passageways, noise, neighbors, accessibility, and how the outdoor fan discharges air.
The photo also shows an existing wall vent higher up on the siding. When we encounter this type of feature, we need to identify its function and respect the applicable clearances. A dryer vent, an air intake, or a mechanical exhaust do not necessarily have the same requirements.
That is precisely why an on-site estimate is useful before determining the final location of a central heat pump.
Why the MIDEA EVOX G3 Deserves Serious Consideration for a South Shore Home
24 V communication or communicating system
Another interesting feature of the EVOX G3 system is its control flexibility.
MIDEA documentation indicates compatibility with 485 communication as well as a traditional 24 V control. The system can therefore be integrated with different configurations of heat pumps, indoor units, and thermostats.
This flexibility becomes particularly relevant when replacing existing equipment. In some buildings, keeping part of the existing wiring can avoid additional invasive work.
MIDEA also offers its communicating thermostat and the SmartHome app, with management of schedules, temperatures, humidity, consumption, and certain system diagnostic functions.
Auxiliary heating: essential to consider when sizing the system
Even with a heat pump designed for cold climates, a Québec central system must be assessed as a whole.
The EVOX G3 can be paired with auxiliary heating kits of up to 25 kW, with different staged-control options depending on the configuration.
However, we seek to avoid having oversized or poorly controlled auxiliary electric heating operate unnecessarily.
True energy savings come from finding a balance: allowing the Inverter heat pump to operate efficiently for as long as possible while maintaining sufficient auxiliary capacity when conditions require it.
LogisVert: verify the exact match rather than relying on the name “EVOX G3”
In Québec, the question of the Hydro-Québec LogisVert incentive comes up almost every time a homeowner considers a central heat pump.
Precision is essential.
Hydro-Québec states that an eligible central heat pump must have a minimum capacity of 24,000 BTU/h and that the complete system includes the outdoor unit and indoor unit. The system must also be new, purchased in Québec, and installed in an eligible residence.
For heat pumps installed since November 26, 2025, Hydro-Québec also specifies that the equipment must be ENERGY STAR certified to qualify for the program.
This means that it is not enough to see “MIDEA EVOX G3” on a quote.
The exact outdoor unit number, indoor unit number, and certified match are decisive. The incentive amount may also vary depending on the heating capacity recognized by Hydro-Québec and the installation date.
At AirGreen, we therefore verify the exact combination before presenting a rebate as guaranteed.
A range capable of covering several home sizes
The EVOX G3 technical specifications help explain why this family of central heat pumps can suit several types of properties.
The configurations shown cover nominal cooling capacities of 18,000, 24,000, 30,000, 36,000, 48,000, and 54,000 BTU/h.
This does not mean that capacity should be selected based on square footage alone.
A recently built, well-insulated 2,000-square-foot home can have a radically different load from a house of the same size built several decades ago.
At AirGreen, we consider the building before focusing on the “2-ton,” “3-ton,” or “4-ton” label.
What we take away from this Napierville installation
This MIDEA EVOX G3 central heat pump installation in Napierville is a good example of a project where the choice of outdoor location complements the machine's technical characteristics.
The unit is raised to better handle winter conditions. The large horizontal-discharge fan maintains clear discharge space. The piping is grouped and protected. The electrical disconnect remains accessible. The entire system stays compact along the building.
Behind this exterior finish is a much more advanced central system: an Inverter compressor, low-temperature heating, airflow control, a modulating indoor unit, 24 V or communicating compatibility, and R-454B refrigerant.
That is precisely where our work at AirGreen takes on its full meaning. We are not merely looking to install a machine with good technical specifications. We want the heat pump to operate properly in the house where it is actually installed, with its ductwork, electrical panel, mechanical space, property, and the building's specific constraints.
We install MIDEA EVOX G3 central heat pumps in Napierville, on the South Shore, as well as in Montréal, Laval, Longueuil, and on the North Shore. For a furnace replacement, an upgrade to a central system, or a project to convert to a cold-climate Inverter heat pump, we can assess on-site the required capacity, ductwork, electrical configuration, outdoor placement, and eligibility for available financial assistance.
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.
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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).