Installation of a 3-ton MIDEA EVOX G3 central heat pump in Saint-Léonard
Discover a complete HVAC installation in Saint-Léonard with the MIDEA EVOX G3 3-ton central heat pump. Performance, energy savings, and optimal comfort throughout Montreal and the surrounding areas.
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 high-performance central HVAC solution adapted to Saint-Léonard's climate realities
In Saint-Léonard, where seasonal temperature fluctuations are significant, choosing a reliable and efficient central HVAC system is not a mere preference, but a necessity. At AirGreen, we recently completed the installation of a 3-ton MIDEA EVOX G3 central heat pump in a typical single-family home in the area. This project perfectly illustrates our approach: technical precision, adaptation to building constraints, and the pursuit of optimal long-term comfort.
From the initial visit, our team identified a clear need: to replace an old, energy-intensive central system with a modern solution capable of ensuring stable heating even at -30°C, while also providing efficient air conditioning during Montreal's humid summers.
Custom HVAC installation in a complex residential environment
Initial Analysis and Specific Project Challenges
The residence presented several technical constraints:
- An existing duct network requiring adaptation without complete reconstruction
- Limited mechanical space in the basement
- Uneven air distribution in some upstairs rooms
- An old, inefficient electric furnace
Our goal: integrate the MIDEA EVOX G3 central heat pump without compromising the existing structure, while significantly improving air circulation and overall energy efficiency.
Strategic Choice of the 3-ton MIDEA EVOX G3
The selected model — MIDEA EVOX G3 (MO1SE-H36B-2A / MAUSE-H36B-2A) — was chosen for several key technical reasons:
- 36,000 BTU (3 tons) capacity perfectly suited to the area
- SEER2 of 17.7 for efficient air conditioning
- HSPF2 of 10.0 for optimized heating
- Reliable operation down to -30°C
- ENERGY STAR® Cold Climate certification
- Eco-friendly refrigerant R-454B
- Controlled outdoor sound level at 62.5 dB(A)
This choice guarantees not only comfort but also a tangible reduction in energy costs.
Complete Installation Process: Rigor and Precision
Preparation and Infrastructure Upgrade
Before installation, our certified refrigeration technicians:
- Inspected and cleaned existing ducts
- Verified electrical compatibility (220V required)
- Adjusted the configuration to optimize airflow
- Prepared the space to accommodate the vertical indoor unit
Outdoor Unit Installation
The outdoor unit was installed on an elevated base, visible in the project photo. This strategic choice allows for:
- Better protection against snow accumulation
- Reduced vibrations
- Easier accessibility for HVAC maintenance
Indoor Installation and System Configuration
The indoor unit was positioned to:
- Maximize uniform air distribution
- Minimize pressure losses in the ducts
- Allow easy access for maintenance
We also configured:
- The integrated WiFi control system
- Airflow via Computational Constant Airflow 2.0 technology
- Inverter settings for intelligent modulation
Concrete Results After Installation
Significantly Improved Thermal Comfort
From the first days of use, the client observed:
- Uniform temperature in all rooms
- Disappearance of cold spots upstairs
- Smooth transition between heating and cooling
Significant Reduction in Energy Consumption
Thanks to Inverter technology and the system's performance:
- Noticeable decrease in monthly costs
- Optimized operation according to actual demand
- Fewer ON/OFF cycles, thus less wear and tear
Silence and Discretion
The controlled sound level of the MIDEA EVOX G3 contributes to a quieter indoor environment, a particularly appreciated point in this residential area of Saint-Léonard.
Grant and Return on Investment
This project allowed the client to benefit from the LogisVert grant, which can reach $3720 (according to current criteria). This significantly reduces the initial installation cost.
Why this investment is wise
- Extended lifespan thanks to a 12-12-10 year warranty
- Reduced energy bills
- Property value appreciation
- Compliance with modern energy standards
Common mistakes to avoid during central heat pump installation
At AirGreen, we regularly correct poorly executed installations. Here are the pitfalls to avoid:
- Undersizing or oversizing the unit
- Neglecting duct balancing
- Installing the outdoor unit without an adequate base
- Omitting vacuuming and pressure tests
- Ignoring the importance of constant airflow
Every installation must be considered as a whole, not just as a simple equipment replacement.
Why choose AirGreen for your HVAC installation in Montreal, Laval, Longueuil, North Shore and South Shore
Proven Field Expertise
Every year, we carry out dozens of central heat pump installations in various contexts:
- Single-family homes
- Duplexes and triplexes
- Condominiums
- Complete renovation projects
A Transparent and Professional Approach
- Free on-site evaluation
- Detailed quote with no surprises
- Installation carried out by certified refrigeration technicians
- Payment only upon client satisfaction
Reliable After-Sales Service
We provide:
- Annual HVAC maintenance
- Rapid diagnostics
- Effective interventions
Case Study: Client Feedback in Saint-Léonard
The owner primarily wanted a stable, quiet, and economical system. After a few weeks of use:
- He confirms improved indoor air quality
- He notices a constant temperature without sudden variations
- He appreciates the mobile app control
This type of feedback validates our approach focused on real performance, not just technical specifications.
Conclusion: A central heat pump adapted to Quebec's requirements
The installation of the 3-ton MIDEA EVOX G3 central heat pump in Saint-Léonard demonstrates that it is possible to combine performance, energy efficiency, and lasting comfort.
At AirGreen, we prioritize solutions adapted to each situation, taking into account the climatic realities of Montreal, Laval, Longueuil, the North Shore, and the South Shore.
A well-chosen and well-installed system truly transforms a home's comfort while reducing long-term costs.
How it goes, from the first call to the end
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 the unit delivers when it is cold
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.
And 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.
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.
Which type of equipment for your project?
Pick what looks like your need.
Four mistakes we do not make
Flip each card to see what we do instead.
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).