Installation of a MIDEA EVOX G3 central heat pump in Saint-Amable, on Montreal’s South Shore
In Saint-Amable, AirGreen installs a MIDEA EVOX G3 central heat pump on a raised wall bracket: Inverter technology, R-454B, operation down to -30 °C, and installation adapted to Quebec winters.
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 MIDEA EVOX G3 installed high off the ground in Saint-Amable: an outdoor detail that truly matters in Quebec's climate
On this project completed in Saint-Amable, our AirGreen team installed a MIDEA EVOX G3 central heat pump, an Inverter technology system designed to supply a duct network and provide both heating and cooling for the residence.
The photo taken after the work immediately shows an important installation choice: rather than placing the outdoor unit at ground level, we installed it on a sturdy metal wall bracket, securely anchored to the masonry and raised high enough to completely clear the base of the unit.
At first glance, this detail may seem secondary. In Saint-Amable and on the South Shore, however, it is directly related to the realities of using a heat pump in winter. Snow accumulation, ice, defrost water, maintenance around the condenser, and airflow must be considered before determining the unit's final height.
The photograph also shows the characteristic format of the EVOX G3 generation: a dark gray vertical outdoor cabinet with a large front-facing fan with horizontal discharge. This design is not merely aesthetic. Midea explains that its vertical heat exchanger combined with horizontal air discharge is intended to provide more even airflow across the heat exchanger and maintain good performance as the outdoor temperature drops.
An outdoor location suited to a residential yard in Saint-Amable
The condenser was positioned along a brick wall, above the foundation, without taking up usable space in the yard.
A nearby window is also visible. The unit was offset from it rather than positioned directly in front of the opening, helping preserve the window's use and making it easier to move around the equipment.
The wall-mounted installation serves several purposes at once here:
- keep the underside of the heat pump accessible;
- reduce direct exposure to snow accumulation at ground level;
- facilitate the drainage of water produced during defrost cycles;
- preserve circulation space in the yard;
- keep the outdoor fan clear;
- provide reasonable access for future HVAC maintenance and service.
However, we must always size and install this type of support according to the actual unit. A central heat pump can be much heavier than a small wall-mounted system. The support, anchors, wall, and bearing points must therefore be selected as a whole.
Why condenser height is particularly important for a heat pump that operates in winter
A central heat pump does not stop as soon as the temperature drops below zero. The MIDEA EVOX G3 was specifically developed to operate under much more demanding conditions.
Midea documentation indicates continuous operation down to -30 °C for the Extreme Heat range. The manufacturer also claims up to 100% heating capacity at -25 °C, with a COP that can reach approximately 1.9 under these conditions, depending on the system considered.
At these temperatures, the outdoor unit must nevertheless periodically perform defrost cycles. The frost accumulated on the heat exchanger is then melted, producing water beneath the unit.
If the condenser is installed too low, this water can gradually contribute to forming a mass of ice beneath the unit. Snow can also reduce the clearances around the heat exchanger.
In the photographed project in Saint-Amable, the significant elevation of the condenser creates a clear space beneath the heat pump. In our daily work in Montreal, Laval, Longueuil, on the North Shore and the South Shore, this consideration of snow and defrosting is an integral part of an installation designed for Quebec's climate.
EVOX G3: a central system range rather than a single capacity
It is important to be precise: EVOX G3 refers to a family of Midea central systems, not a single capacity.
The construction-site photo does not show the nameplate clearly enough to honestly confirm the exact capacity of this system. We therefore do not arbitrarily assign it a capacity that is not visible in the information provided.
Midea's technical documentation presents systems in this family covering nominal capacities ranging from approximately 18,000 to 54,000 BTU/h in cooling, with several combinations of indoor and outdoor units. The range offers efficiencies of up to 19 SEER2, 12.5 EER2, and 10.8 HSPF2, depending on the exact combination.
The manufacturer's technical table notably presents the following pairings for the Extreme Heat models:
18,000 BTU: MAUSE-H18B-2A with MO1HE-H18B-2A
24,000 BTU: MAUSE-H24B-2A with MO1HE-H24B-2A
30,000 BTU: MAUSE-H30B-2A with MO1HE-H30B-2A
36,000 BTU: MAUSE-H36B-2A with MO1HE-H36B-2A
48,000 BTU: MAUSE-H48B-2A with MO1HE-H48B-2A
54,000 BTU: MAUSE-H60B-2A with MO1HE-H60B-2A.
This shows why the term “EVOX G3” alone is not enough to establish the capacity, exact efficiency, or eligibility for potential financial assistance. The outdoor model, indoor model, and their certified combination must always be confirmed.
Performance suited to a central heat pump in Quebec
The technical data sheet for the EVOX G3 generation shows efficiency differences according to capacity.
For example, the 18,000 BTU system in the Extreme Heat range is listed at up to 19 SEER2, 12.5 EER2, and 10.1 HSPF2. The 30,000 BTU system is listed at 17.2 SEER2 and 10.8 HSPF2, while the 36,000 BTU system reaches 17.7 SEER2 in the combination presented by Midea.
These figures matter, but we never choose a central heat pump solely by comparing SEER2 ratings.
For a home in Saint-Amable, we must also consider the building's heat loss, the existing duct network, the required airflow, the available static pressure, the condition of the insulation, the actual heated area, and the system the heat pump is replacing.
A larger unit is not automatically a better unit. A properly sized system tends to provide more consistent cycles, better air distribution, and more stable comfort.
What really distinguishes the installation of an EVOX G3 in an existing central system
A heat pump designed to adapt to different duct networks
In a central system, the outdoor unit visible in the photo is only half of the system.
Inside the home is an air handler connected to the duct network. The quality of this part of the installation is just as important as that of the outdoor heat pump.
Midea integrated its Computational Constant Airflow 2.0 technology into the EVOX G3. According to the manufacturer, the system can adjust the fan's operation to maintain airflow under different static pressures and filtration conditions. The documentation states a capacity of operation up to 1.2 in. of water column static pressure and up to 60 airflow adjustment levels.
This is particularly relevant in renovations.
Two homes in Saint-Amable with the same floor area can have very different duct networks. One may have large, relatively short ducts; the other may have several branches, more restrictive ducts, or a filter offering greater resistance.
The indoor fan must be configured for the actual building.
The M-Coil and symmetrical fan: a less visible but important part of the EVOX G3
Midea also worked on the geometry of its indoor unit.
The documentation compares a conventional air handler with its design using an M-Coil and a symmetrical fan. The manufacturer indicates an airflow difference of approximately 2% between the evaporator sections and a pressure drop of less than 0.02 in. of water column in the configuration shown, compared with larger differences in the conventional example.
For the homeowner, the goal behind this design is tangible: to distribute air more evenly through the heat exchanger so that the available surface works more uniformly.
This type of feature is not visible when simply looking at the condenser in the yard. Yet it directly contributes to the operation of the entire central HVAC system.
A modular indoor unit that facilitates certain renovations
The EVOX G3 was also designed with a modular air handler.
Midea indicates six installation possibilities: upflow vertical, downflow vertical, right horizontal, left horizontal, and two low-boy configurations. The “Block N Lock” design allows the modules to be separated and reconfigured to facilitate moving and installing them in tight spaces.
In our line of work, this detail is highly valuable.
Residential mechanical rooms are not always spacious. We regularly work in finished basements, narrow mechanical closets and homes where the old unit was installed before several renovations.
The ability to transport and configure the equipment sections more easily can prevent unnecessary modifications around the equipment.
A format designed to replace certain existing furnaces
Midea also presents the EVOX G3 as a solution that facilitates the replacement of existing central units.
According to the documentation, the cabinets use widths comparable to those of many residential furnaces, ranging from approximately 14.5 to 21.5 in, depending on the capacity. The air handler can also operate at 115 V or 208/230 V through automatic voltage adaptation.
This does not mean that a new heat pump can be connected without an electrical inspection. The outdoor unit still has its own requirements, and all auxiliary heating must also be sized correctly.
This rather means that the platform was designed to simplify certain modernization scenarios.
Auxiliary heating: up to 25 kW depending on the configuration
In a Quebec central heating system, auxiliary heating remains an element that must be planned for.
Midea offers 10 kW, 15 kW and 25 kW auxiliary electric heat kits, with operation that can be arranged in three stages. The manufacturer states that this modulation is used to adapt the auxiliary heat output to conditions and better control electricity consumption.
However, we must size this element carefully.
An unnecessarily oversized electrical element increases the load on the electrical system. Conversely, insufficient auxiliary heat can become problematic if the home's heat loss exceeds the available capacity of the heat pump under certain conditions.
The assessment must therefore encompass the house, the heat pump, the electrical panel, the ductwork and the auxiliary heating.
The R-454B is an integral part of this new generation
The EVOX G3 range uses R-454B, an A2L-classified refrigerant.
Midea documentation indicates a global warming potential, or GWP, of 466 for this refrigerant and specifies that R-454B was selected for the product range concerned.
For the installer, switching to R-454B requires following the methods, tools and procedures corresponding to A2L equipment.
This is therefore not simply a new label on the condenser. Piping preparation, connections, evacuation, testing and commissioning must all be carried out according to the manufacturer's requirements and applicable regulations.
485 communication, 24 V thermostat and smart control capability
The EVOX G3 does not necessarily impose a single control architecture.
Midea indicates that the system can operate using 485 communication or a 24 V control, with automatic detection of the control mode. The documentation also provides for integration with third-party thermostats in certain configurations.
For a central system replacement, this flexibility can be useful because the wiring available in an existing home is not always identical to that in a new construction.
With the Midea communicating thermostat and SmartHome app, the documentation also provides for schedule management, comfort and energy-use monitoring, as well as certain self-diagnostic and remote-update functions.
Enhanced filtration can be integrated into the central system
Another advantage of a ducted system is the ability to treat the air throughout the entire home at a central point.
Midea indicates that its enhanced filtration module can accommodate 1-, 2- or 4-inch filters, up to MERV 13 in the configuration described.
Again, a more restrictive filter is not automatically preferable without analyzing the system. Fan capacity, required airflow and static pressure must remain compatible.
That is why we always check the system before simply replacing a standard filter with a much denser media filter.
The LogisVert rebate must be verified with the exact combination installed
For homeowners considering a central heat pump in Saint-Amable, the question of Hydro-Québec financial assistance is naturally important.
Since November 26, 2025, Hydro-Québec has indicated that installed heat pumps must notably be ENERGY STAR® certified to qualify for the applicable financial assistance. The amount and eligibility must be determined based on the list in effect at the time of installation.
Midea documentation states that the EVOX G3 range exceeds the ENERGY STAR Most Efficient criteria presented by the manufacturer.
However, at AirGreen, we never stop at the brand or commercial name. To confirm a rebate, we verify the exact combination of the outdoor unit and indoor unit, as well as the applicable certification reference. Hydro-Québec also specifies that a complete central heat pump system must include indoor and outdoor equipment meeting the Program's conditions.
This is the safest way to avoid basing a project on an amount that would not correspond to the configuration actually installed.
What we take away from this AirGreen installation in Saint-Amable
This installation clearly shows the difference between simply placing a heat pump next to a house and planning a central HVAC installation for Quebec's climate.
In the photo, several decisions are immediately visible: the condenser is elevated on a wall bracket, the front fan remains completely unobstructed, the unit is offset from the window, and the installation preserves usable space around the building.
Behind this visible part are decisions that matter just as much: heat pump capacity, indoor unit sizing, airflow, auxiliary heating, adaptation to the duct system, electrical supply, controls, and commissioning.
This is the approach we apply at AirGreen for central heat pump installations in Saint-Amable, Montreal, Laval, Longueuil, on the South Shore and the North Shore.
The MIDEA EVOX G3 offers a particularly comprehensive platform for a central retrofit: inverter technology, cold-weather operation, R-454B, adjustable air treatment, static pressure that can adapt to different duct systems, and several control options.
But the equipment is only one part of the result. Its placement, sizing, and installation quality determine how this technology will actually perform in the home, winter after winter.
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).