Project

Installation of a Midea EVOX G3 central heat pump in Sainte-Rose (Laval)

AirGreen installed a Midea EVOX G3 central heat pump on a brick bungalow in Sainte-Rose, Laval. With its outdoor unit mounted on wall brackets, optimal snow clearance, and connection to the existing forced-air system, discover how this Midea central heat pump now provides heating and cooling for the entire house, summer and winter.

By AirGreen Climatisation & Chauffage Admin5 min read
Installation of a Midea EVOX G3 central heat pump in Sainte-Rose (Laval)
Installation of a Midea EVOX G3 central heat pump in Sainte-Rose (Laval)
–chapters in this story
5 minreading time
–type of installation
2025year published
The tour

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.

Generic diagram: central heat pump, indoor module and ducts

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.

  1. It captures or rejects heat outside. It sits on a level base, above the snow, with free space all around.

  2. The insulated refrigerant lines enter the house through a sealed opening and run to the indoor coil.

  3. A shut-off switch near the outdoor unit isolates it safely for service.

  4. Sitting on the indoor module, it moves heat between the house air and the refrigerant.

  5. Electric furnace or air handler: its fan pushes air through the ducts. The electric backup takes over in extreme cold.

  6. Supply ducts bring air to the rooms; returns bring it back to the unit. Their condition matters as much as the unit's.

  7. It protects the coil and the fan. A dirty filter cuts airflow, so it gets checked regularly.

  8. It runs the heat pump and the backup heat. It must be compatible with the installed system.

The job

In Sainte-Rose, many brick houses built in the 1970s and 90s are looking to modernize their heating and air conditioning systems. It was in this context that we installed a Midea central heat pump in a typical bungalow in the neighborhood, to provide true year-round comfort while reducing electricity bills.


Context: replacing an energy-intensive system with a modern solution

Our client had an existing forced-air heating system combined with an old central air conditioning unit. The challenges were clear:

  • High electricity consumption and limited heating performance;

  • Unequal comfort between rooms in the house;

  • A noisy outdoor condenser, located too close to the ground and vulnerable to snow;

  • Desire to take advantage of a more environmentally friendly solution, compatible with energy efficiency programs.

We therefore offered him a Midea EVOX G3 central heat pump , an R-454B model of about 3 tons, perfectly suited to the size of the bungalow and to Laval winters.


The Midea EVOX G3 central heat pump: the heart of home comfort

The Midea EVOX G3 is a next-generation central heat pump designed to work in tandem with an electric furnace or air handling unit. It allows you to:

  • Air conditioning for the entire house in the summer via existing ducts;

  • Efficient heating in mid-season and winter , greatly reducing reliance on electric elements or an old furnace;

  • Power modulation thanks to variable speed technology, for stable and quiet comfort.

By choosing Midea, the customer benefits from:

  • With excellent energy efficiency (high SEER2 and HSPF) ;

  • Using R-454B refrigerant, which is more environmentally friendly than an R-410A system;

  • A solution designed for northern climates , capable of operating in cold weather with optimized defrosting cycles.


Visible details of the outdoor installation

The photo clearly illustrates the Midea outdoor unit installed on the brick wall of the house:

  • The device, which is dark grey in color, is mounted on sturdy wall brackets fixed in the concrete foundation;

  • The installation height provides significant clearance from the ground , which protects the condenser from the accumulation of snow, ice, and dirt;

  • The large side-exhausting fan allows for efficient air removal , while maintaining a pleasant noise level for the customer and the neighborhood;

  • To the right of the unit, a properly installed electrical disconnect box can be seen, in accordance with the electrical code and manufacturer requirements.

This configuration ensures:

  • Free air circulation around the heat pump;

  • Easy access for maintenance and service;

  • Vibration reduction is achieved through console mounting and the use of anti-vibration accessories.


Interior integration: consistent comfort in all rooms

Even though the photo only shows the exterior, this Midea EVOX G3 central heat pump is connected to an existing air distribution system inside the house:

  • The outdoor unit is connected to an air manager inside via insulated, carefully routed and protected refrigerant lines;

  • Air is distributed to each room through the original ducts, allowing the owner to enjoy the same level of comfort in all areas : living room, bedrooms, basement, etc.

  • The main thermostat in the house now controls the Midea heat pump and the backup electric furnace, automatically switching between them based on the outside temperature.

The result: the house benefits from a complete central system , but with the modern technology of a high-performance heat pump.


Winter performance and defrost management

In Sainte-Rose, as elsewhere in Laval, winters can be harsh. The Midea EVOX G3 is designed for:

  • Continue to heat efficiently even when the temperature drops well below zero;

  • Automatically manage defrost cycles to keep the outdoor heat exchanger ice-free;

  • Prioritize energy efficiency by using the heat pump as long as it remains advantageous compared to backup electric heating.

The elevated installation shown in the photo is essential for:

  • Allow the snow to accumulate on the ground without blocking the device;

  • Facilitate the flow of defrost water;

  • Prevent premature corrosion by keeping the bottom of the unit away from puddles and splashes.

It is these details that extend the lifespan of the equipment and maintain its performance year after year.


A meticulously designed installation, by AirGreen

The AirGreen logo visible on the condenser is a reminder of our commitment:

  • Personalized analysis : we size the heat pump according to the house, its insulation and the habits of the household;

  • Professional installation : solid fixings, discreet routing of refrigerant lines, adequate electrical protections;

  • Complete commissioning : vacuuming, pressure checks, configuration of Midea EVOX G3 parameters;

  • After-sales service : usage advice, periodic maintenance, support in case of questions or adjustments.

For this project in Sainte-Rose, the client now has a system:

  • More economical than 100% electric heating;

  • More comfortable than an old central air conditioner;

  • More environmentally friendly thanks to the R-454B refrigerant.


Why choose AirGreen for your Midea central heat pump in Greater Montreal?

Whether you are in Laval (Sainte-Rose, Duvernay, Chomedey) or elsewhere in Greater Montreal, we can assist you with:

  1. The assessment of your current system (furnace, ducts, existing air conditioner);

  2. Choosing the right Midea EVOX G3 or ATOM X central heat pump model, according to your needs;

  3. The creation of a clean, safe and optimized installation for Quebec winters;

  4. The preparation of documents required for certain aid or funding programs, where applicable.

Our goal: to ensure your home enjoys year-round comfort , with controlled energy consumption and equipment that will serve you faithfully for many years.

The unit

The unit on this job, in figures

The range as published on airgreen.ca: pick a size to see its capacity in deep cold.

The range, size by size
SizeHeating at −8 °CHeating at −15 °CColdest certified pointCOP at −15 °CSEERHSPFIndicative LogisVert aid
Midea EVOX G3 · 1.5 tons14,70018,600−30 °C: 11,8002.1219.010.1$1,764
Midea EVOX G3 · 2 tons20,80020,600−30 °C: 12,1002.1418.610.0$2,496
Midea EVOX G3 · 2.5 tons24,00033,200−30 °C: 17,9001.9717.210.8$2,880
Midea EVOX G3 · 3 tons33,00037,400−30 °C: 27,6001.918.010.0$3,960
Midea EVOX G3 · 4 tons39,50048,000−30 °C: 27,2002.017.59.5$4,740
Midea EVOX G3 · 5 tons45,00054,000−30 °C: 37,3001.917.59.5$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 steps

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.

Step 1 of 9The on-site estimate

We look at the ducts, the current indoor module, the electrical panel and the planned spot for the outdoor unit.

  1. The on-site estimateWe look at the ducts, the current indoor module, the electrical panel and the planned spot for the outdoor unit.
  2. The quoteThe equipment combination, capacity and price, in writing. We check whether the combination qualifies for assistance programs.
  3. Getting readyAccess protected, old unit disconnected and removed when it is being replaced.
  4. The indoor moduleElectric furnace or air handler, with its coil, connected to the supply and return ducts.
  5. The outdoor unitOn a level base, raised above the snow, with free space all around.
  6. The refrigerant linesInsulated, they enter through a sealed opening and run to the indoor coil.
  7. Electrical and thermostatDedicated circuits, accessible disconnect, a thermostat that works with the heat pump and the backup heat.
  8. Tests and start-upLeak test, vacuum, start-up, airflow check and a test of both modes.
  9. The walkthroughFilter, thermostat, backup heat in extreme cold: what to know before winter.
Your numbers

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.

Before / afterThe cost of the same heat

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):

Before · baseboards11.142¢/kWh
After · heat pump–

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.

Size checkYour electric furnace, in BTU/h
–BTU/h of installed electric heat

    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.

    Mistakes avoided

    Four mistakes we do not make

    Flip each card to see what we do instead.

    Going further

    Your own project, step by step

    Through the seasons

    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.
    At your place

    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.

    0 / 6 checked
    True or false

    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.

    2. In extreme cold, electric backup heat can take over.

    3. The filter only gets changed when the unit breaks down.

    4. You can reuse the old unit's size without checking.

    Frequently asked questions

    What people ask us about this kind of work

    11 questions
    Can I keep my current ducts?
    Often, yes: the central heat pump connects to the existing ducts. We check their condition and size during the estimate.
    What happens in extreme cold?
    The indoor module (furnace or air handler) works with the central heat pump and takes over in extreme cold.
    Furnace, air handler, ducted: what is the difference?
    The furnace or air handler is the indoor module of the central system. A ducted system hides in the ceiling: all you see are small supply grilles.
    Are there grants?
    Depending on the equipment and your situation, assistance programs may apply. AirGreen checks the exact combination before quoting an amount. See the grants.
    Do I need a permit?
    Rules vary from city to city. See permits and by-laws, and we check for your address.
    How much can I save?
    Hydro-Québec says a heat pump can be up to three times more efficient than baseboards for heating in the colder months. The result depends on the house, the climate and how it is used.
    How is the LogisVert assistance calculated?
    For ENERGY STAR cold-climate certified heat pumps, Hydro-Québec lists assistance of $120 per 1,000 BTU/h of heating capacity at −8 °C. AirGreen checks the exact model before quoting an amount; only Hydro-Québec confirms the assistance granted. See the grants.
    Will my current thermostat work?
    Not always: the thermostat has to run the heat pump and the backup heat. We check compatibility during the estimate.
    Central or wall units: which one?
    If the house has ducts in good shape, a central system heats and cools every room at once. Without ducts, wall units or a multi-zone are often simpler. We compare on site.
    Does AirGreen hold the required licences?
    Yes. AirGreen holds RBQ licence 5645-9605-01, subclasses 15.8 Ventilation, 15.10 Refrigeration and 16 Electricity.
    Is the estimate free?
    Yes. The on-site estimate is free and the quote follows within 24 hours. Book my free estimate.

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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).

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