Installation of a MIDEA EVOX G3 Central Heat Pump in Mercier–Hochelaga-Maisonneuve
HVAC installation of a MIDEA EVOX G3 central heat pump in Mercier–Hochelaga-Maisonneuve. A high-performance, subsidized solution adapted to Montreal winters with AirGreen expertise.
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 Complete Transformation of Residential Comfort in the Heart of Mercier–Hochelaga-Maisonneuve
At AirGreen, every HVAC installation is an opportunity to solve concrete challenges while optimizing comfort and energy efficiency. In this project completed in Mercier–Hochelaga-Maisonneuve, we installed a MIDEA EVOX G3 1.5-ton (18,000 BTU) central heat pump in a typical single-family home in the area, with a challenging outdoor configuration and very real space constraints.
From the first visit, our team identified a key issue: the outdoor unit had to be installed in a restricted space, between two brick walls, with already established vegetation and limited air circulation. This type of situation is common in densely built neighborhoods of Montreal, and requires a precise technical approach to ensure the long-term performance of the system.
A Central Heat Pump Designed for Quebec's Climate
Exceptional Performance Down to -30°C
The MIDEA EVOX G3 is specifically designed for Quebec's harsh winters. Unlike many standard systems, it maintains stable heating capacity even when temperatures drop drastically.
Key technical features:
- Heating Capacity: 18,000 BTU down to -30°C
- SEER2: 19.0
- HSPF2: 10.1
- EER2: 12.5
- ENERGY STAR® (cold climate) Certification
- Eco-friendly refrigerant R-454B
- Outdoor sound level: 56.5 dB(A)
This level of performance allows homeowners to reduce their reliance on auxiliary systems while maintaining constant comfort, even during cold snaps in Montreal, Laval, or on the South Shore.
Project Analysis: Constraints and Custom Solutions
Optimized Exterior Wall Installation
In this project, the installation of the outdoor unit represented the main technical challenge. The available space was:
- Narrow (wall corner)
- Partially obstructed by branches
- Located near a metal railing
We opted for an installation on reinforced wall brackets, in order to:
- Avoid ground vibrations
- Protect the unit from snow accumulation
- Maximize air circulation around the condenser
Our refrigeration technicians also adjusted the installation height to ensure optimal hot air exhaust in heating mode, a detail often overlooked but crucial for winter performance.
Piping and Drainage Management
The system requires 3/8 - 3/4 piping, which we carefully integrated along the exterior wall with complete mechanical protection. The challenge here was twofold:
- Maintain a clean and discreet aesthetic
- Ensure perfect insulation against thermal losses
We also installed a secure drainage system, essential to prevent water accumulation and the risk of freezing in winter.
Indoor Installation: Integration into an Existing System
Adaptation to a Typical Residential Configuration
The house was already equipped with a forced-air duct network. We therefore integrated the MIDEA EVOX G3 with a MAUSE-H18B-2A air handler, compatible with existing installations.
The advantages of this approach:
- Reduced installation costs
- Less invasive work
- Optimized airflow in all rooms
Flexible Configuration
The indoor unit allows several configurations:
- Upflow
- Downflow
- Horizontal left/right
In this specific case, we opted for an upflow configuration, ideal for uniform air distribution on the upper floors.
Concrete Energy Efficiency for the Client
LogisVert Subsidy: $1764
This project is eligible for a $1764 subsidy, which represents a significant financial advantage for the client.
At AirGreen, we systematically assist our clients with:
- Eligibility verification
- Document preparation
- Submission of the application
Reduced Energy Consumption
Thanks to its high efficiency, the central heat pump allows for:
- A significant reduction in heating costs
- Better management of air conditioning in summer
- Consistent thermal stability
Technical Details of the Installation
Complete Specifications
- Outdoor model: MO1HE-H18B-2A
- Indoor model: MAUSE-H18B-2A
- Voltage: 220V
- WiFi: Included
- Outdoor dimensions: 35 x 13.5 x 26.5 inches
- Indoor sound level: 37 / 42.5 dB(A)
Exceptional Warranty
- Compressor: 12 years
- Parts: 12 years
- Labor: 10 years
This comprehensive coverage reflects the system's reliability and our commitment to customer satisfaction.
Common Errors Avoided in This Project
Over the years, we have identified several common errors in similar HVAC installations:
- Installing the outdoor unit too close to a wall (poor ventilation)
- Neglecting duct insulation
- Undersizing the system's capacity
- Ignoring drainage management in winter
In this project, each of these errors was carefully avoided through rigorous planning and precise execution.
Why Choose AirGreen for Your HVAC Installation in Montreal
An Approach Based on Field Expertise
At AirGreen, we don't just install systems. We analyze each situation to offer a truly adapted solution.
Our commitments:
- Free on-site estimate
- No payment until complete satisfaction
- Certified and experienced refrigeration technicians
- Fast and efficient after-sales service
A Strong Local Presence
We operate daily in:
- Montreal
- Laval
- Longueuil
- North Shore
- South Shore
This proximity allows us to understand the specific realities of each neighborhood, as here in Mercier–Hochelaga-Maisonneuve.
Final Result: Durable and Smart Comfort
At the end of the installation, the client benefits from:
- A quiet and efficient system
- Smart control via WiFi
- Stable temperature throughout the house
- Significant energy savings
This project perfectly illustrates how a MIDEA EVOX G3 central heat pump can transform the comfort of a Montreal home, even under complex installation conditions.
At AirGreen, every detail counts — and that's what makes the difference.
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.
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).