Installation of a MIDEA EVOX G3 4 Ton Electric Furnace with Central Air Handler System in Saint-Lambert
AirGreen Installs a 4-Ton MIDEA EVOX G3 Electric Furnace in Saint-Lambert: Central System, Air Handler, Neat Connections, and Optimized Comfort on the South Shore.

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 compact and tidy central installation in a confined mechanical space in Saint-Lambert
In Saint-Lambert, on the South Shore, our AirGreen team recently completed the installation of a MIDEA EVOX G3 4-ton electric furnace, integrated into a central system with an air handler. This project perfectly illustrates the type of intervention where field experience makes all the difference: a narrow mechanical space, existing ducts, a delicate transition between the existing equipment and the new module, and particular attention paid to finishing, sealing, and future accessibility for HVAC maintenance.
From the first glance, the installation shows a common challenge in South Shore residences: maximizing the performance of a central system while respecting the physical constraints of a compact mechanical room. The new MIDEA EVOX G3 unit was precisely positioned next to the existing duct network, ensuring a clean connection to the upper plenum and harmonious integration with the already present metal ducts.
A MIDEA EVOX G3 4-ton central system designed for lasting comfort
The MIDEA EVOX G3 4-ton is a central solution designed for homes requiring uniform air distribution through a duct network. In this project in Saint-Lambert, the objective was clear: to offer a reliable, well-sized system capable of meeting the needs of a residential building where air circulation, temperature stability, and quality of execution are essential.
Why an electric furnace with an air handler?
An electric furnace combined with an air handler allows conditioned or heated air to be distributed throughout the house from a central point. This type of configuration is particularly attractive for homeowners who already have a duct network and wish to modernize their HVAC system without multiplying wall units in rooms.
In the case of this installation, the choice of a central system allowed for the preservation of a discreet interior aesthetic while improving the consistency of comfort in the different zones of the residence. For many homeowners in Montreal, Laval, Longueuil, the North Shore, and the South Shore, this approach represents an excellent balance between performance, comfort, and ease of use.
A 4-ton size adapted to the building's needs
The 4-ton size is suitable for homes with a significant demand for airflow and treatment capacity. When a system is poorly sized, the consequences can be significant: too short cycles, discomfort, poorly controlled humidity, excessive consumption, or premature wear of components. This is why our team always checks the existing configuration, the required capacity, the condition of the ducts, and the connection constraints before finalizing the installation.
In Saint-Lambert, the positioning of the MIDEA EVOX G3 was carried out to respect future service needs, access to panels, technical clearances, and the routing of connection lines visible on the right side of the unit.
Clean integration with existing ducts
The image of the installation clearly shows the importance of finishing work. The metal connections above the unit were adjusted and sealed to limit air loss. In a central HVAC installation, the sealing of the network is as important as the quality of the machine itself. An excellent furnace or air handler cannot perform optimally if the treated air escapes into a mechanical room, a technical ceiling, or an unconditioned space.
Our technicians therefore paid particular attention to the following points:
- solid connection between the unit and the plenum;
- sealing of metal joints;
- clean routing of insulated lines;
- maintaining practical access to service panels;
- protection of connections and sensitive areas;
- finishing adapted to a tight mechanical space.
The main challenge: working in a limited space without compromising quality
This installation in Saint-Lambert was not a simple equipment substitution. The mechanical space imposed real constraints: little lateral clearance, presence of an old duct module nearby, a very close right wall, high-level connections, and the need to maintain a professional finish despite the lack of space.
In this type of project, a common mistake is to install the unit solely based on what "fits" physically into the room. At AirGreen, we go further. We also think about future maintenance, the possibility of removing panels, cleaning, inspections, electrical checks, and eventual airflow adjustments. An installation that is too tight or poorly oriented can complicate every future intervention and increase costs for the homeowner.
The importance of drainage and insulated lines
The image also shows the insulated lines running along the right side of the unit. Their positioning is important to reduce thermal losses, avoid unwanted condensation, and protect components against temperature variations. In a central installation, these details are never secondary.
Incorrect line routing can lead to vibrations, rubbing, premature insulation deterioration, or access difficulties. Our team therefore ensures that each line is installed with a logical, clean path compatible with the mechanical environment.
A solution adapted to demanding South Shore homeowners
In Saint-Lambert, many properties have compact mechanical rooms, sometimes modernized through different generations of equipment. A new MIDEA electric furnace must then integrate into an existing environment where ducts, clearances, and access points have not always been designed for modern systems.
It is precisely in these situations that AirGreen's expertise becomes essential. We do not just install a machine. We analyze the complete context: air circulation, connections, sealing, accessibility, safety, finish, and overall system coherence.
What homeowners should check before replacing a central system
Before investing in a new electric furnace or a central air handler, it is important to check several elements. These points help avoid unpleasant surprises and ensure a durable installation.
The condition of the ducts
Poorly sealed, too small, crushed, or unbalanced ducts can reduce system performance. Even with a modern machine like the MIDEA EVOX G3, the distribution network remains an essential part of the final result.
Clearance around the unit
Central equipment must remain accessible. Panels must be able to be opened, filters replaced, and components inspected. An installation too cramped against a wall or an obstacle can hinder maintenance.
The right sizing
The choice of a 4-ton capacity must be consistent with the house, the ducts, and real needs. An oversized or undersized system can create discomfort and reduce efficiency.
The quality of sealing
Metal joints, transitions, and connections must be well sealed. Air leaks can affect comfort, increase consumption, and create temperature differences between rooms.
An installation that reflects our AirGreen approach
This project demonstrates our way of working: clean execution, attention to detail, and a complete understanding of the HVAC system. In Saint-Lambert, our team delivered an installation where every component has its place, where connections are designed to last, and where the machine remains accessible for future services.
We regularly carry out this type of installation in Montreal, Laval, Longueuil, on the North Shore, and the South Shore. Each building has its specificities: old houses with existing ducts, partial renovations, narrow mechanical spaces, needs for quick replacement, or the desire to improve overall comfort. Our role is to adapt the solution to the real context, rather than applying a uniform method.
Concrete benefits for the customer
After the installation of this MIDEA EVOX G3 4-ton, the client benefits from a modernized central system, better integrated and ready to ensure efficient air distribution in the residence. The visible finish in the mechanical room also facilitates future inspections and maintenance interventions.
The main benefits are:
- more uniform comfort in the house;
- better integration with the duct network;
- compact and modern central equipment;
- maintained access to service panels;
- professional finish in a confined space;
- system adapted to the needs of a South Shore residence.
Why choose AirGreen for a central MIDEA installation?
A central HVAC installation requires more than just product knowledge. It demands an understanding of the building, ventilation, airflow, electrical constraints, mechanical connections, and the realities of the field. At AirGreen, we combine this technical expertise with a transparent and structured approach.
For an electric furnace, a central heat pump, an air handler, or a complete system replacement, we analyze every detail before and during installation. This rigor allows us to achieve a reliable, clean, and durable result.
An installation in Saint-Lambert that speaks for itself
The final result is a clean, well-integrated central installation adapted to the available space. The MIDEA EVOX G3 4-ton electric furnace fits perfectly into the mechanical room, with visible, organized, and accessible connections. In a Saint-Lambert residence, this type of project represents an excellent example of successful HVAC modernization: performance, finish, and attention to detail.
For homeowners in Montreal, Laval, Longueuil, the North Shore, and the South Shore, this project demonstrates that a central system can be installed cleanly even in a complex environment, provided the work is entrusted to a team that truly understands the demands of the field.
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.
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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Each dot: a town where AirGreen has published projects. The glowing dot: this job.
Every house has its constraints. We see them before we install.
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).
