Installation of a MIDEA EVOX G3 4 Ton Electric Furnace in Pierrefonds-Roxboro
AirGreen installs a 4-ton MIDEA EVOX G3 electric furnace in Pierrefonds-Roxboro: compact central system, adapted ductwork, and meticulous HVAC installation.
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 Central Installation Where Every Inch Counted
In this project completed in Pierrefonds-Roxboro, our AirGreen team installed a 4-ton MIDEA EVOX G3 electric furnace, integrated into a central system with an air handler. Upon arrival, one element was evident: the available mechanical space was restricted, with a tight configuration between existing ducts, the water heater, and circulation access.
This type of installation requires much more than a simple appliance replacement. It's necessary to assess the space, duct alignment, air transition, future access for HVAC maintenance, as well as the quality of the sealing around connections. In this specific case, the new MIDEA unit had to be cleanly integrated into a narrow mechanical room while ensuring reliable airflow for the entire residence.
Why Choose a 4-ton MIDEA EVOX G3 for a Central System
The MIDEA EVOX G3 is a particularly attractive solution for homeowners looking to modernize their central heating and air conditioning system without compromising indoor comfort. In a house located in Pierrefonds-Roxboro, where winters are cold and summer humidity can be heavy, a well-sized central system makes a tangible difference in daily life.
The 4-ton capacity meets the needs of a residence requiring a significant air volume, especially when the house has multiple living areas, floors, or an already established duct network. The goal is not just to install a newer machine, but to create a balance between performance, comfort, quiet operation, and energy efficiency.
An HVAC Installation Designed for Durability
In the project photo, the work done around the connection to the existing ductwork is clearly visible. The metal transition was adapted to ensure stable airflow between the new electric furnace and the distribution system. This detail is important, as a poor connection can cause several problems:
- pressure losses in the ducts;
- excessive operating noise;
- poor distribution of hot or cold air;
- decreased system efficiency;
- premature wear of certain components.
At AirGreen, we pay particular attention to these elements, because a successful HVAC installation depends as much on the chosen machine as on the quality of its on-site integration.
A Well-Managed Space Challenge
The mechanical room in this Pierrefonds-Roxboro residence did not allow for much maneuverability. The proximity of the water heater, the close walls, and the narrow passageway required precise installation. Our technicians had to position the unit to preserve access to service panels, electrical connections, and necessary elements for future inspections.
It is often in these kinds of details that the experience of a specialized HVAC contractor in Montreal, Laval, Longueuil, North Shore, and South Shore becomes essential. A central installation should never be designed solely for the day of installation. It must also allow for simple, safe, and logical maintenance in the following years.
The Importance of Duct Sealing
Another visible aspect of the installation concerns the sealing of metal connections. The joints were carefully sealed to limit air leaks. In a central system, even a small leak can reduce the overall performance of the installation. Treated air must reach the rooms, not be lost in the mechanical room.
Good sealing notably allows for:
- better air pressure in the ventilation outlets;
- a more uniform temperature in the house;
- a reduction in unnecessary cycles;
- improved electric heating efficiency;
- more stable comfort during very cold or very hot days.
For homeowners comparing different electric furnace or central system options, this point is often underestimated. However, the quality of the connection can have as much impact as the appliance's technical specifications.
A Solution Adapted to the Realities of Pierrefonds-Roxboro Homes
Pierrefonds-Roxboro has a varied housing stock: single-family homes, bungalows, renovated properties, homes with extensions, and central systems that have been in place for several years. In many cases, replacing an old central unit requires a custom adaptation rather than a standard installation.
In this project, the existing configuration required a pragmatic approach. The new appliance had to integrate into an already present duct network without creating unnecessary restrictions. Our team therefore paid particular attention to the available height, the transition between the unit and the plenum, and the overall mechanical stability.
MIDEA EVOX G3: Central Comfort and Energy Efficiency
The MIDEA EVOX G3 series is designed to offer modern performance with an efficiency-oriented approach. For homeowners looking to improve their comfort without completely transforming their internal network, this range represents a serious option.
In a 4-ton installation, proper sizing is essential. An undersized unit risks running continuously during periods of high demand. An oversized unit can create short cycles, impair dehumidification, and reduce comfort. Before installing this type of system, our team verifies the actual needs of the residence, the duct configuration, the condition of the existing network, and the physical constraints of the mechanical room.
Subsidies and Eligibility: A Point to Validate Before Installation
Subsidy programs may vary depending on the exact model, the installed combination, the residence, and the criteria in effect at the time of the project. For central systems and compatible heat pumps, it is important to confirm eligibility before the final signature.
At AirGreen, we help our clients better understand available programs, especially those that may apply in Montreal, Laval, Longueuil, the North Shore, and the South Shore. In the case of a MIDEA central system, eligible amounts may depend on the complete combination between the indoor unit, the outdoor unit, certified performance, and the requirements of the program in effect.
What Homeowners Should Avoid During a Central Replacement
Replacing an electric furnace or central air handler should never be treated as a simple unplug-and-re-plug operation. Several errors can compromise the final result:
Neglecting the condition of existing ducts
A poorly sealed, undersized, or misaligned duct network can limit the performance of a new appliance. Before investing in a new unit, it is necessary to inspect transitions, return air ducts, and main connections.
Forgetting about maintenance access
In a cramped mechanical room, every inch counts. Access to panels, filters, electrical components, and inspection areas must be planned. An installation that is too constrained can complicate future HVAC maintenance work.
Choosing a capacity without analysis
The choice of a 4-ton capacity must be consistent with the actual needs of the house. Comfort depends on sizing, air distribution, and installation quality.
Underestimating the importance of metal connections
A poorly fabricated or poorly sealed transition can create noise, air leaks, and uneven performance. Sheet metal work is a central part of the installation.
The Final Result: A Clean, Robust, and Functional Installation
The result achieved in Pierrefonds-Roxboro demonstrates the importance of a methodical approach. The 4-ton MIDEA EVOX G3 electric furnace was installed compactly, with careful integration into the duct network. Despite the restricted space, the unit remains accessible for future interventions, and the air transition has been adjusted to support good circulation throughout the house.
This type of project reflects our way of working at AirGreen: analyzing real constraints, choosing an adapted solution, installing cleanly, and considering the client's long-term comfort. Whether in Montreal, Laval, Longueuil, on the North Shore, or the South Shore, every central installation deserves this level of attention.
Why Choose AirGreen for a Central System
The installation of a central system requires expertise that combines heating, air conditioning, ventilation, electricity, sheet metal, and an understanding of the building. Our team regularly works on similar projects, both for replacing old electric furnaces and for integrating more efficient systems.
We know that homeowners are looking for a reliable, well-installed, easy-to-maintain system that is compatible with their actual needs. This is precisely the objective of our interventions: to offer a complete, well-thought-out HVAC solution adapted to the home.
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.
More jobs to see, near you
By town, by equipment or by region: browse more than 4,700 published projects.
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).