Installation of a Midea wall-mounted heat pump in Saint-Lambert
AirGreen installs a Midea Inverter heat pump in Saint-Lambert in the middle of winter: rapid commissioning, optimal energy efficiency and guaranteed indoor comfort.
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.
Mounted level on a wall plate, high enough for the air to reach the whole room, with enough space around it to slide the filters out easily.
The refrigerant lines, the communication cable and the drain go through the wall in a single opening, sealed against water, cold air and insects.
Two insulated copper pipes connect the two units. Outside, a line cover can protect them from sun, knocks and weather.
A shut-off switch near the outdoor unit isolates it safely for service. It must stay accessible at all times.
The compressor and the fan. In heating mode it captures heat from the outdoor air, even in winter, and moves it inside.
On the ground or on the wall, it keeps the unit above accumulated snow. The unit stays clear and defrost water can drain away.
The fan needs to blow freely. Storage, a fence or a wall too close, and efficiency drops while noise goes up.
New HVAC System Installed Despite Winter Challenges
At AirGreen , we know that indoor comfort can't wait for the warmer weather. That's why our team recently completed the installation of a Midea wall-mounted heat pump in the middle of February, in Saint-Lambert , on the South Shore of Montreal .
Despite the heavy snow and freezing temperatures, our technicians ensured impeccable commissioning , fully compliant with RBQ and TEQ standards.
The context: a necessary replacement before the cold wave
The owner contacted us after his old wall-mounted air conditioner stopped working in mid-January. Wanting a versatile and energy-efficient solution, he opted for a Midea Inverter heat pump , a model renowned for its consistent performance down to -25°C .
Our mission: to dismantle the old system and install the new one in a single day , before the temperature drop expected the following night.
Preparation and logistics on a winter construction site
Winter installation requires meticulous planning . The outdoor area first had to be cleared of snow and stabilized to accommodate the new unit's anti-vibration base.
Our technicians then:
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Checked the minimum distance to the ground to avoid ice accumulation around the condenser;
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Positioned the new wall bracket at a height adapted to the topography of the land;
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Inspected the existing electrical outlet and replaced the outdoor switch with a CSA approved, freeze-resistant model.
These steps are crucial to ensure the security and durability of the system.
Technical installation of the Midea Inverter heat pump
The Midea wall-mounted heat pump installed was a 12,000 BTU model, perfectly suited to the size of the ground floor of the residence.
Here is the precise progress of the work:
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Fixing the interior wall bracket with reinforcements at the anchor points.
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Refrigeration piping and reinforced thermal insulation with waterproof tape to prevent infiltration.
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Installation of the outdoor condenser , carefully leveled on a moisture-resistant composite base.
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Connection of the refrigeration lines and complete vacuuming of the circuit.
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Nitrogen leak test to ensure stable pressure before recharging.
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Commissioning and calibration of the inverter compressor according to Midea specifications.
Despite the temperature of -12°C, the vacuum was carried out perfectly, ensuring a circuit completely free of humidity .
Start-up and final check
Once the system was up and running, our technicians proceeded to:
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Measurement of operating pressures in heating mode;
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Checking the condensate drain to prevent future freezing;
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The communication test between the indoor and outdoor modules.
Result: the heat pump delivered stable and quiet power , with an indoor blowing temperature of 41°C after only 5 minutes.
The client immediately noticed a soft and even heat in all the main rooms.
An installation by AirGreen: quality and reliability
Each AirGreen HVAC installation follows a rigorous methodology:
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Personalized thermal assessment before choosing the model;
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Safe installation according to Quebec building codes;
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Complete calibration and testing before project delivery;
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Labor and parts warranty on each system installed.
By opting for AirGreen, the customer benefits not only from a high-performance system, but also from responsive after-sales service , available at all times in Montreal, Laval and on both shores.
The advantages of the Midea Inverter heat pump
This heat pump model offers:
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High energy efficiency (up to 21 SEER) ;
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Ultra-quiet operation (less than 45 dB);
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An inverter compressor that automatically adjusts speed according to demand;
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Stable performance down to -25°C , ideal for Quebec winters.
Thanks to its efficiency and reliability, the Midea Inverter represents a sustainable solution for reducing heating costs while increasing indoor comfort .
Conclusion: comfort restored, even in the middle of winter
The installation of the Midea heat pump in Saint-Lambert demonstrates our expertise in demanding conditions.
Thanks to our expertise and rigorous planning, the client now benefits from a high-performance, energy-efficient HVAC system ready to face the Quebec winter .
AirGreen — Experts in Midea heat pump installation and repair in Greater Montreal, Laval, the North Shore and the South Shore.
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 room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
Model, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
Floors and furniture protected, wall plate position marked level, wall opening located.
A single opening, with the slope the drain needs to flow outside.
Set on a stand raised above the snow, with the clearances the manufacturer requires.
Connected, insulated and protected. The opening is then sealed against water, cold air and insects.
A dedicated circuit and an accessible disconnect near the outdoor unit.
Leak test, vacuum, then start-up and a check of heating and cooling.
Remote, modes, filters: we show you the essentials before we leave.
- The on-site estimateWe look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
- The quoteModel, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
- Getting readyFloors and furniture protected, wall plate position marked level, wall opening located.
- The wall openingA single opening, with the slope the drain needs to flow outside.
- The outdoor unitSet on a stand raised above the snow, with the clearances the manufacturer requires.
- Lines, cable and drainConnected, insulated and protected. The opening is then sealed against water, cold air and insects.
- The electrical workA dedicated circuit and an accessible disconnect near the outdoor unit.
- Tests and start-upLeak test, vacuum, then start-up and a check of heating and cooling.
- The walkthroughRemote, modes, filters: we show you the essentials before we leave.
And 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.
What to do, season by season
Three habits per season for this unit. They take a few minutes and prevent many calls.
- Clean the indoor unit's filters.
- Clear leaves and debris left on the outdoor unit by winter.
- Test cooling before the first hot days.
- Clean the filters more often when the unit runs a lot.
- Keep plants away from the outdoor unit.
- Check that no water drips from the indoor unit.
- Rake the leaves around the outdoor unit.
- Test heating before the first cold days.
- Book periodic maintenance before winter.
- Keep snow away from the stand and the front of the unit.
- Let the unit defrost: it is normal.
- Never hit the ice on the fins; call us if the unit stays iced up.
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What people ask us about this kind of work
Does a wall-mounted heat pump heat in winter?
Wall-mounted or multi-zone: how do I choose?
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Do I need a permit?
How cold can it heat?
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How is the LogisVert assistance calculated?
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The outdoor unit is covered in ice: is that normal?
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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).