A clean, quiet installation designed for four-season comfort in Montreal
At AirGreen , we work weekly on residential HVAC installations in Greater Montreal . Our mission here: to modernize the comfort of a home in Rosemont–La Petite-Patrie with a Mitsubishi Electric wall-mounted heat pump . The client's goal is clear: precise air conditioning in the summer and efficient supplemental heating in the winter, while controlling operating costs and indoor noise levels.
Why a Mitsubishi Electric wall-mounted heat pump?
Mitsubishi Electric is one of the international leaders in residential mini-splits. The latest wall-mounted units offer:
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fine modulation of power (inverter), ideal for maintaining a stable temperature;
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standard power outputs from 9,000 to 24,000 BTU, suitable for single rooms as well as open areas;
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quiet operation: interior noise level among the lowest in its category;
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reliable performance in cold climates, essential for the greater Montreal , Laval , Longueuil , North Shore and South Shore regions.
For an apartment or plex floor in Rosemont, a well-sized wall-mounted header effortlessly covers the main living area, while reducing the use of electric baseboard heaters.
Sizing and preparation
Before any HVAC installation , we take measurements on site: surfaces, orientation, solar gains, insulation quality, air infiltration. This assessment guides the capacity (e.g. 12 k BTU for a well-insulated average-sized living room). We then confirm:
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the available amperage and the reserve at the electrical panel;
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the optimal position of the head for even diffusion without direct air currents on sensitive areas;
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the feasibility of a gravity drain (priority) or the need for a silent condensate pump ;
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the shortest and most aesthetic route for refrigeration lines and food.
Installation of the inner head: precision and aesthetics
The Mitsubishi Electric wall unit is mounted on a metal plate that is laser-leveled . We guarantee:
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a single hole through the load-bearing wall, made at a controlled angle for the slope of the drain;
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the cleanliness of the finishes at the right of the passage (internal sealing mouth, no play, no vibration);
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sufficient clearance above and below the appliance for maintenance and good air intake.
The perfect alignment of the shutter and the discretion of the fixings ensure a clear visual integration into the living room.
Refrigeration connections and power supply: sustainability first
We solder and insulate copper lines according to the rules of the art:
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nitrogen test (≈ 300 psi) to check for leaks;
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deep vacuum (≤ 500 microns) to remove all moisture and non-condensables;
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respect for the equivalent length and differences in level in order to avoid pressure losses;
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discreet routing on the exterior side with lacquered aluminum line covers matching the facade when required.
On the electrical side, we install a dedicated circuit that complies with the Code (wire gauge, circuit breaker, proximity circuit breaker/disconnect box outside), for uncompromising safety.
Condensate management: no trace, no odor
Whenever possible, we favor gravity flow to the outside, with a constant slope and a check valve. If the configuration requires it (remote outlet, finished basement), we integrate a compact, soundproofed lifting pump with simplified maintenance. The user thus avoids any risk of dripping or stagnant water.
Result: comfort, silence and cost control
Once the unit is powered up, we perform:
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checking the parameters (air flow, blowing temperature, intensity, static pressure);
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calibration of the remote control (programs, modes, instructions, child lock if desired);
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Customer training: best practices for HVAC adjustment and maintenance (filter cleaning, frequency, warning signs).
The visible result: a wall-mounted air conditioner that cools quickly without aggressive drafts, and a heat pump that effectively supports heating in the off-season while reducing the electricity bill compared to pure resistors.
Maintenance and longevity
To maintain performance:
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dust the filters every 4 to 8 weeks during intensive use;
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plan for periodic professional cleaning (evaporator, turbine, tray and drain) to avoid odors and maintain heat exchange;
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check the condition of the line covers and exterior wiring after winter (freezing/thawing, falling ice);
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Clear the outdoor condenser of snow and obstacles — a snow guard can be added if necessary.
Grants and Eligibility
Several Mitsubishi Electric Energy Star and cold climate ranges are eligible for provincial and municipal programs when performance criteria are met. We guide our customers in Montreal , Laval , Longueuil , the North Shore and the South Shore to verify eligibility (exact model, power, installation conditions) and prepare the required documents.
Common pitfalls to avoid
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Undersizing : A unit that is too small operates continuously, wears out prematurely and degrades comfort.
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Excessive line travel : pressure losses, fluid noise and reduced efficiency.
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Uncertain drainage : odors, leaks, damage. A real slope or a reliable pump is required.
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Poorly chosen location : restricted air intake, direct blowing onto the sofa, temperature stratification.
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Lack of dedicated electrical control : non-compliance and risk of untimely tripping.
Daily usage tips
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Maintain a stable setpoint (e.g. 23°C summer, 21°C mid-season) to take full advantage of inverter modulation.
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Use dehumidification mode on humid days: increased comfort without overcooling.
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Program the shutters to direct the flow above the passageways and circulate the air without a “draft”.
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In winter, keep the outdoor condenser clear and elevated above the snow line.
Our AirGreen method in Rosemont–La Petite-Patrie
We plan each project with realistic time slots , a dedicated team leader, a quality control list and a report at the end of the intervention. This rigor results in rapid installation, clean finishes and documented commissioning (photos, test values, serial numbers). This guarantees a system that performs from day one and for a long time.
What if your project is different?
Single-family homes, high-rise condos, duplexes with limited access, two- or three-head MultiZones , or replacements for existing systems: we adapt the sizing, the installation of supports , the defrost management, and the room-by-room control strategy. Our role is to optimize comfort and bills, not to sell power "at random."
In summary : a properly sized and properly installed Mitsubishi Electric wall-mounted heat pump provides four-season comfort, consistent air quality, and significant savings. In Rosemont–La Petite-Patrie , as throughout Greater Montreal , our team takes care of everything: consulting, HVAC installation , configuration, and HVAC maintenance monitoring. Let's talk about your living space, your energy budget, and grant opportunities: we'll be with you from start to finish.