Installation of a MIDEA EVOX G3 Central Heat Pump in Sainte-Thérèse: performance, precision, and perfect adaptation to Quebec's climate
HVAC installation in Sainte-Thérèse: MIDEA EVOX G3 18,000 BTU central heat pump, high efficiency, LogisVert subsidy, performance down to -30°C and optimal comfort all year round.
- City
- Region
- Equipment
- Brand
- Challenges
- Published
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
Strategic HVAC Installation in a Sainte-Thérèse Residence: Optimal Comfort Summer and Winter
At AirGreen, every HVAC installation is conceived as a unique project. In Sainte-Thérèse, on the North Shore of Montreal, we recently completed the installation of a 1.5-ton (18,000 BTU) MIDEA EVOX G3 central heat pump in a residential home requiring a powerful, compact solution adapted to Quebec's harsh winters.
This project perfectly illustrates our approach: precise needs analysis, selection of a highly efficient system, and impeccable technical execution.
Why the MIDEA EVOX G3 was the ideal choice for this property
A concrete response to Sainte-Thérèse's climate challenges
The client was looking for a system capable of:
- Maintaining a stable temperature in winter, even below -25 °C
- Offering uniform cooling in summer
- Reducing energy consumption
- Being eligible for LogisVert subsidies
The MIDEA EVOX G3 central heat pump met all these criteria, with remarkable performance:
- Heating capacity down to -30 °C
- SEER2: 19.0
- HSPF2: 10.1
- EER2: 12.5
- ENERGY STAR® certified (cold climate)
- Eco-friendly refrigerant R-454B
This combination ensures excellent energy efficiency throughout the year.
Job site analysis: technical constraints and tailored solutions
Installation on elevated structure: stability and durability
As can be seen in the photo, the outdoor unit was installed on a robust elevated steel support, directly on the balcony. This type of installation is often necessary in multi-story homes or condominiums.
Challenges encountered:
- Limited space on the balcony
- Need to reduce vibrations
- Protection against snow accumulation
Solutions provided by AirGreen:
- Use of a reinforced anti-vibration support
- Secure fastening with solid anchoring
- Optimized positioning to ensure good airflow
Management of refrigerant lines and electrical supply
The installation required clean and efficient integration of existing ducts:
- Piping: 3/8 – 3/4
- Voltage: 220V
- Duct passage through exterior brick wall
We have:
- Thoroughly inspected the ducts
- Ensured perfect sealing
- Protected the lines with weather-resistant insulating sheathing
A critical point: noise management
In a residential environment like Sainte-Thérèse, noise is a determining factor.
The MIDEA EVOX G3 offers:
- 56.5 dB(A) outdoors
- Stable operation without abrupt variations
We oriented the unit to minimize sound propagation towards neighbors and living spaces.
Indoor installation: optimizing space and airflow
Adaptable air handler configuration
The MAUSE-H18B-2A indoor unit was installed in a confined space, requiring a specific configuration.
Thanks to its modular design, we were able to:
- Adapt the configuration (optimized airflow)
- Maximize air distribution throughout the house
- Avoid major structural modifications
Uniform air distribution: real daily comfort
The client immediately noticed:
- A constant temperature
- An absence of cold or hot spots
- Smooth and non-aggressive air circulation
This type of result is directly linked to a precise and well-calibrated installation.
LogisVert subsidy: a significant financial advantage
This project was eligible for a subsidy of $1764, which represents a significant incentive for homeowners wishing to improve their energy efficiency.
At AirGreen, we support our clients in:
- Eligibility validation
- Document preparation
- File submission
Mistakes to avoid when installing a central heat pump
Through our experience in Montreal, Laval, Longueuil, on the North Shore and South Shore, certain mistakes frequently recur:
1. Undersizing or oversizing the system
Incorrect sizing directly impacts:
- Comfort
- Energy consumption
- Equipment lifespan
2. Neglecting installation
Even the best machine can become inefficient if:
- Ducts are poorly installed
- Vacuum is not properly performed
- Connections have micro-leaks
3. Ignoring building specifics
Every house is different. A standard approach does not work.
Why choose AirGreen for your HVAC installation in Sainte-Thérèse
Real field expertise
We have completed hundreds of installations in:
- Montreal
- Laval
- Longueuil
- North Shore
- South Shore
Each project enhances our ability to anticipate challenges and offer effective solutions.
Rigorous methodology
During each installation, we apply:
- Pressure testing
- Vacuum drawing (controlled microns)
- Complete system verification
- Optimized commissioning
Transparency and customer satisfaction
- Free on-site estimate
- No payment until complete satisfaction
- Honest and tailored advice
Final result: a transformed home
After installation, the client benefits from:
- Constant thermal comfort
- A significant reduction in energy consumption
- A quiet and intelligent system
The MIDEA EVOX G3 central heat pump proved to be a perfectly suitable choice for this Sainte-Thérèse residence.
Conclusion: a durable and high-performing HVAC solution for the North Shore
This project demonstrates that a well-executed HVAC installation is as important as the choice of equipment.
The combination of:
- A high-performing machine
- Professional installation
- Adaptation to local conditions
allows for a lasting and optimal result.
At AirGreen, we continue to offer customized solutions for each client in Montreal, Laval, Longueuil, the North Shore, and the South Shore, with a clear priority: real-world performance.
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).