Installation of a Gree R-32 series wall-mounted heat pump in Sainte-Dorothée (Laval)

Four-season comfort for a brick garage and floor: a neat, quiet installation designed for our winters

In this project, we are modernizing the comfort of a house in Sainte-Dorothée (Laval) with a Gree R-32 series wall-mounted heat pump, chosen for its cold performance, energy efficiency and reliability. The outdoor unit is mounted on wall brackets above a garage door, on a brick facade , with a dedicated outdoor disconnect box and rear passage of the connections for a clean finish. The objective: efficient heating and cooling of an open-plan space adjacent to the garage, while minimizing noise and protecting the equipment from bad weather and shocks.

Client background and objectives

• Building Type : Single-family brick house with garage.

• Needs : to cool down at the height of summer and provide reliable heating support in the off-season and during very cold weather; to reduce energy bills.

• Site constraints : large garage opening, vehicle circulation, clearances to be respected, aesthetics of the facade, resistance to cold Laval/North Shore .

Choosing the right equipment: why choose a Gree R-32 wall-mounted heat pump ?

Gree is one of the leading manufacturers of wall-mounted heat pumps in Quebec. The R-32 platforms offer:

• Better seasonal efficiencies (SEER/SCOP) and reduced refrigerant charge .

• Cold climate performance with low temperature capacity maintenance, ideal for Laval, Montreal, Longueuil , South Shore and North Shore .

• Quiet operation on both the exterior and interior sides.

• Compatibility with energy transition programs when efficiency and operating temperature criteria are met.

For this project, we are choosing a unit capacity adapted to the area served (living room + landing near the garage). The sizing takes into account insulation , orientation , solar gains and the thermal behavior of the adjacent garage.

Outdoor installation: clean, robust, designed for winter

Fixing on wall brackets above the garage

• Height : high to protect against snow mixing , impacts (vehicles, bicycles, garage equipment) and facilitate defrosting flow .

• Vibrations : silent blocks and calibrated tightening to limit transmission to the masonry; discreet operation on the neighboring side.

• Clearances : respect free distances in front of the blower and on the sides; absence of direct obstacles (ramp or guardrail).

Passage of connections and external disconnection

• Short path refrigerant lines (≈ 2–3 m estimated), rear outlet behind the unit for a minimalist brick look .

• Dedicated power supply from the house panel, arriving in a waterproof disconnect box (to the right of the unit) with exterior approved flexible conduit .

• Defrost condensate management : free evacuation outside the passage area; no dripping on the garage door.

Why not a slab on the ground?

• Risk of snowdrifts and frost at the bottom of the wall.

• Exposure to projectiles (gravel, snow shovel, wheels).

• Preserved aesthetics and gain in floor space around the garage entrance.

Interior path and finishing

• Wall-mounted fan positioned to efficiently circulate air in the target area without direct airflow onto the living area.

• Single drilling with waterproof sheath ; insulation of connections and discreet internal capping if required.

• Condensate management by gravity when the configuration allows it; otherwise, silent and easily accessible lifting pump for maintenance.

• Communication and power wiring separated from refrigerant lines for easy diagnosis and maintenance.

AirGreen commissioning and quality controls

1. Nitrogen leak test and deep vacuum with micron measurement.

2. R-32 charge check according to actual lengths; adjustment if required by manufacturer's specifications.

3. Electrical check : tightening, polarities, grounding, conformity of the dedicated circuit breaker .

4. Settings : modes, speeds, automatic defrosting, optimization of the heating setpoint to limit the short cycle.

5. Performance measurements : blown temperatures, ΔT, intensity, noise; submission of a commissioning report .

Results for the client

• Rapid cooling in summer thanks to high diffusion and the short distance between the head and the space to be treated.

• Stable heating in mid-season; reduced use of main heating.

• Perceptible silence on the garage side and on the neighbor side.

• Preserved brick facade : no visible duct, only the unit on stainless steel supports and a compact disconnect .

HVAC Use and Maintenance Tips

• Keep filters clean (clean every 4–8 weeks depending on dust and animals).

• In winter , clear the area in front of the outdoor unit after snow; do not obstruct the blower .

• Program stable setpoints to maximize performance; avoid temperature yo-yos.

• Carry out annual maintenance : thorough cleaning of the evaporator/condenser, leak check, electrical checks.

• Monitor condensate flow ; abnormal noise or error code = service .

Possible grants and eligibilities

Depending on the exact version of the Gree R-32 series installed (certified efficiencies and cold operating range), provincial programs may apply in Greater Montreal (Montreal, Laval , Longueuil , North Shore , South Shore ). We guide our customers on:

• minimum efficiency criteria ;

• the required documents and proof of installation ;

• optimizing return on investment (energy savings + incentives).

Pitfalls to avoid when installing HVAC on a garage facade

• Insufficient height : exposure to projected snow and melting; risk of fan freezing.

• Too short front clearance **: air recirculation, reduced capacity and premature frosting.

• Absence of disconnect within range**: non-compliance and difficulty of maintenance.

• Unsealed openings : air/water infiltration and thermal bridges.

• Undersizing or oversizing : short cycles, discomfort, wear.

Why AirGreen for your HVAC installation in Greater Montreal?

• Wall-mounted heat pump specialists : expertise in Gree, Midea, Fujitsu, Sharp, etc. brands.

• “Brick facade” approach : mechanical anchors, suitable seals and vibration management .

• Complete service : estimate, design, installation , instrumented commissioning, HVAC maintenance and grant support.

• Coverage : Montreal, Laval, Longueuil, North Shore, South Shore .

Project summary technical sheet

• Type : single-zone wall-mounted heat pump for floor adjacent to the garage.

• Brand : Gree – R-32 platform .

• Installation : wall brackets on brick, above the garage door.

• Power supply : dedicated circuit, external disconnect box .

• Refrigerant path : short (≈ 2–3 m), rear exit; discreet finishes.

• Objectives : 4-season comfort, high efficiency , reduced noise , preserved aesthetics .

And for your home in Montreal, Laval, Longueuil, North Shore or South Shore?

We evaluate the thermal load , the facade constraints , the electricity and your comfort priorities to recommend the most relevant heat pump : Gree (R-32), Midea (Midea28/Midea35), Fujitsu (Altair/Orion), Sharp (ZU1/THU), etc. Our promise: a durable, compliant installation , optimized for the Quebec winter .

Practical tips to extend lifespan

• Keep one meter of clear space in front of the unit all year round.

• Install a snow guard if the roof cladding creates direct runoff into the unit.

• Prefer professional cleaning of the condenser in the spring.

• Have pressure and subcooling values ​​checked every 1–2 years.

Deadlines and typical procedure

1. Technical visit (measurements, electrical assessment, anchor points on brick).

2. Submission with scenarios (capabilities/finished).

3. Installation : 4 to 6 hours in an existing house for a single zone with short run.

4. Commissioning and training in use.

5. Follow-up : HVAC maintenance reminder and grant assistance.

Need an estimate? We respond quickly in Sainte-Dorothée , Chomedey , Duvernay , Montreal , Longueuil , North Shore and South Shore . A properly sized and properly installed wall-mounted heat pump transforms your comfort while controlling your operating costs.