Installation of a 2-ton MIDEA EVOX G3 central heat pump in Montreal North
AirGreen installs a 2-ton MIDEA EVOX G3 central heat pump in Montreal-North, with a rooftop unit, adapted supports, neat connections, and local HVAC expertise.
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The job on one screen
The unit’s data sheet
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 article, chapter by chapter
A rooftop installation that required precision, stability, and adaptation to the building
In Montreal-North, our AirGreen team installed a MIDEA EVOX G3 2-ton central heat pump, in a typical urban building context where outdoor space is limited and every installation detail counts. Here, the outdoor unit was installed on a flat roof, securely positioned on a raised structure with wooden crossbeams, metal supports, and protective bases to adequately distribute the load without compromising the membrane's waterproofing.
This configuration is particularly important for central heat pump installations in dense residential areas, especially in Montreal, where access, clearances, drainage management, vibrations, and integration with existing ducts must be carefully planned. Unlike a ground-level installation, a rooftop installation requires greater attention to mechanical stability, surface protection, the trajectory of refrigerant lines, and secure connection to the interior of the building.
A MIDEA EVOX G3 2-ton chosen for efficient heating and central air conditioning
The MIDEA EVOX G3 is a highly relevant solution for homeowners who want to modernize their central system without necessarily transforming the entire building's HVAC infrastructure. In this project in Montreal-North, the choice of a 2-ton capacity met the dwelling's comfort needs while maintaining a balanced approach: enough power to ensure efficient air conditioning in summer, but without unnecessary oversizing that could reduce comfort, increase short cycling, and negatively affect overall performance.
The MIDEA EVOX G3 central heat pump is renowned for its cold-weather performance, variable-speed technology, and ability to provide reliable heating even during typical cold periods in the greater Montreal area. It is a very attractive option for homeowners comparing different central heating, central air conditioning, and replacement solutions for older, less efficient systems.
Visible specifics of this installation
In the photo of this installation, several technical elements deserve to be highlighted. The outdoor unit is positioned on an independent base, composed of wooden crossbeams installed on white protective supports. This approach limits direct contact with the roof membrane and better distributes the equipment's weight.
Also noteworthy:
- vertical metal supports that elevate the unit;
- sufficient clearance around the unit for air circulation;
- refrigerant lines carefully directed towards the roof outlet;
- insulating protection around the pipes;
- electrical connection installed nearby;
- special attention to managing the transition between the roof and the building.
In an HVAC installation of this type, it's not enough to just place the equipment and plug it in. The quality of the result depends on all the details: the unit's orientation, vibration prevention, pipe protection, support solidity, electrical safety, and future accessibility for HVAC maintenance.
Why rooftop installation requires particular expertise
In Montreal-North, as in many areas of Montreal, properties can have significant space constraints. Yards are sometimes small, alleys difficult to access, and adding an outdoor unit at ground level is not always the best option. The roof then becomes a logical solution, but it requires rigorous planning.
Our technicians must check, among other things:
- the stability of the chosen location;
- the protection of the roof membrane;
- the distance between the outdoor unit and the indoor equipment;
- the trajectory of the refrigerant lines;
- the possibility of accessing the unit for future maintenance;
- the necessary clearances to ensure good performance;
- the reduction of vibrations transmitted to the building.
In this specific case, installation on a raised structure keeps the unit well clear of the roof surface. This also helps protect the appliance against water accumulation, light snow, debris, and the impacts of freeze-thaw cycles. For a central heat pump installed in Quebec, this type of detail directly influences the equipment's durability.
Careful integration with existing central ducts
One of the advantages of a 2-ton central heat pump is its ability to power an existing duct network, when compatible. Before installation, our team always evaluates the general system configuration: ducts, plenum, return air, electrical supply, available mechanical space, and compatibility with the indoor unit.
Poor evaluation can lead to several problems: insufficient airflow, excessive noise, reduced performance, discomfort between rooms, or premature equipment wear. At AirGreen, we place great importance on this step, because a high-performing machine can only achieve its full potential if the installation is well adapted to the building.
In this project in Montreal-North, the objective was clear: to offer a modern, efficient, and stable central system, while respecting the building's physical constraints. The rooftop work therefore had to be coordinated with the interior integration to ensure uniform performance in both heating and air conditioning.
Mistakes to avoid when installing a central heat pump on a roof
A rooftop installation may seem simple at first glance, but several mistakes can be costly in the long run. Among the most frequent, we observe:
- placing the unit directly on the membrane without adequate protection;
- neglecting the clearance height under the unit;
- installing pipes without sufficient protection against the elements;
- placing the unit in a hard-to-access location for maintenance;
- poor vibration management;
- underestimating the importance of drainage around the unit;
- choosing an unsuitable capacity for the building.
These errors can reduce the equipment's lifespan and complicate future interventions. A well-executed HVAC installation must plan not only for immediate operation but also for maintenance, safety, and reliability over several years.
A solution adapted to the realities of Montreal, Laval, Longueuil, the North Shore, and the South Shore
We regularly carry out similar installations in Montreal, Laval, Longueuil, on the North Shore, and the South Shore. Each sector has its specificities: semi-detached houses, Montreal plexes, condos, buildings with restricted access, flat roofs, narrow yards, or aging central systems.
The MIDEA EVOX G3 integrates well into many of these contexts, particularly when the client is looking for an efficient central solution, eligible for certain subsidies depending on current programs, and capable of improving the property's overall comfort.
For homeowners, the most important thing is not to choose based solely on price or brand. The final result depends on three elements: correct sizing, installation quality, and compatibility with the building. It is precisely on these three points that our team focuses its work.
Comfort obtained after installation
Once the installation is complete, checks are essential. We control the connections, start-up, unit behavior, communication between components, system pressure, airflow, and thermostat response. This step confirms that the MIDEA EVOX G3 2-ton central heat pump is operating as expected and that the client can enjoy stable comfort.
The desired outcome is simple: a more uniform temperature, efficient central air conditioning during warm periods, powerful heating when temperatures drop, and reduced dependence on more energy-intensive systems. In an area like Montreal-North, where many buildings were constructed before current energy efficiency standards, this modernization can transform the daily experience of occupants.
The importance of regular HVAC maintenance
After installation, HVAC maintenance remains a key element. A central heat pump installed on a roof is exposed to wind, snow, temperature variations, leaves, dust, and debris. Periodic maintenance allows for checking the unit's general condition, coils, connections, pipe insulation, drainage, and overall performance.
We recommend that homeowners schedule regular inspections, especially before seasons of heavy use. A well-maintained system consumes less, operates better, and limits the risk of breakdowns when comfort becomes essential.
Why AirGreen for central heat pump installation in Montreal-North
At AirGreen, we approach every project as a combination of technical expertise, field experience, and adaptation to the building. This installation in Montreal-North perfectly illustrates our method: choosing the right machine, clean rooftop installation, respecting physical constraints, protecting the membrane, careful connections, and comprehensive checks.
Whether it's a central heat pump, a central air conditioner, a wall-mounted air conditioner, a multi-zone system, or a complete replacement, our priority remains the same: to offer a reliable, well-installed solution that is truly adapted to the client's needs.
For homeowners in Montreal, Laval, Longueuil, on the North Shore, or the South Shore, an installation like this demonstrates the importance of entrusting the project to a team that understands local constraints, technical requirements, and the concrete expectations of occupants.
The job tools
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.
How the job unfolds
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 we check on a job like this one
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.
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.
Good habits, once the unit is in place
Six simple habits that keep the unit going. Your list stays on this device.
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.
The right pages, at the right time
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).