Installation of a Fujitsu wall-mounted heat pump in Outremont

A high and discreet integration into a family living room

In an apartment in Outremont , we installed a Fujitsu wall-mounted heat pump above a low cabinet, on a solid wall with moldings. The client's objective was clear: to achieve four-season comfort in a multipurpose room (games room and reading corner) while preserving a refined aesthetic. The high positioning, just under the cornice, allows air to be projected along the ceiling for even diffusion towards the center of the room and the adjoining hallway, without hindering the opening of doors or the use of furniture.

The building's layout provides an exterior façade immediately behind this wall. We therefore opted for a "back-to-back" route : a single through-hole, gravity drain , and very short refrigerant connections. This choice maximizes the efficiency of the Fujitsu inverter unit, reduces pressure losses, and limits perceived noise, since the outdoor compressor operates at partial load most of the time.

From planning to commissioning: the AirGreen method

Load study and capacity selection

Before any installation, we take measurements of the room: floor area, ceiling height, window type, and solar exposure. The actual volume and family usage lead to a capacity of 12,000 BTU —enough modulation to cover summer heat peaks and supplemental heating during the off-season. The Fujitsu low-temperature wall-mounted range selected maintains its performance when the mercury drops, a crucial point in Montreal.

Why this ability works here:

• room of approximately 18–22 m² with access to the corridor;

• high-performance windows, limited infiltration after re-sealing;

• need silence in the evening for the children's routine: the inverter avoids sudden restarts.

Precise placement on a molded wall

• Installation template : we position the wall plate by integrating the relief of the upper molding to maintain ≥ 10 cm of clearance above the interior head.

• Structural marking : anchors in the uprights and, between them, expanding metal dowels for a hold > 60 kg.

• Level and plumb : fine adjustment to ensure drainage without stagnation on the evaporation tray.

Drilling, air barrier and drain

The 65 mm hole is made with an outward slope (≈ 5 mm) to allow gravity flow of the condensate. On the inside, we restore the continuity of the vapor barrier : sleeve, closed-cell foam then elastomeric mastic. The drain pipe receives an anti-drip tab at the outside outlet, keeping water away from the facings and avoiding marks on the masonry.

Refrigerant connections and cowling

• 1/4–3/8 copper insulated with high-density cellular foam, bend radii respected to avoid constricting the fluid.

• Estimated total length : only 1.5 to 2 m thanks to the “back-to-back” journey.

• On the outside, white UV trunking with stainless steel collars; large radius elbows to protect the insulation and reduce losses.

Power supply and safety

• Dedicated circuit from the main panel to a proximity switch at the condenser; watertight cable glands and CSA compliant conduit.

• Grounding and continuity testing.

• Clear panel labeling for easy HVAC maintenance.

Instrumented commissioning

Our technicians perform a deep vacuum (target < 300 microns ) with a resistance test, then validate the refrigerant charge according to the actual length of lines. The checks include:

• Delta-T supply air / return air;

• compressor intensity and voltages;

• summer operating pressures and simulated defrost sequence .

A commissioning report is provided to the customer, useful for the Fujitsu warranty and for any future diagnostics.

Measurable result: comfort, silence and clean air

• Thermal comfort : the blower directs the air along the ceiling, which then descends without drafts onto the playing area.

• Silence : in night mode, the sound level drops to the floor; no more buzzing from old window devices.

• Air quality : washable filters accessible from the front and coil treatment to limit clogging; the room feels cooler and healthier during periods of humidity.

• Savings : Continuous modulation prevents overconsumption. The first few weeks of use show a reduction in kWh in summer and economical heating support in spring and autumn.

Execution details that make the difference

Finishes and aesthetics

We favor a “clean” installation: no visible cover inside, correction of micro-daylights around the plate, localized paint touch-ups . Outside, the chute follows a vertical and discreet path, aligned with the facade elements. The condenser is installed in the backyard, on an anti-vibration slab , with 60 cm of lateral clearance and 1 m on the front face.

Winter/summer and snow management

• Free-standing defrost drain, without stalactites; drain outlet away from woodwork and passage.

• Condenser installation height adapted to snow compaction ; if exposed to a loaded roof, possible addition of a snow guard .

• In summer, the direction of the air discharge prevents recycling and protects play areas.

Safety and longevity

• Tightening torque precisely applied to flare fittings, with esterified oil; insulating caps.

• Service loop provided in the chute to facilitate possible replacement or the addition of a second head in the medium term.

• Silent blocks under the condenser and anti-vibration spacers on the brackets.

HVAC Maintenance: Our Simple and Effective Plan

A high-performance system stays efficient if it is maintained. Our annual HVAC maintenance plan includes:

1. thorough washing of the evaporator (fine cleaning of the fins and the tangential fan);

2. drain control and disinfection of the tank;

3. checking electrical connections , currents and communication;

4. rinsing the condenser, gently straightening the fins with a comb;

5. validation of parameters and updating of usage advice (setpoint ranges, Dry mode, weekly programming).

We show the customer how to rinse the filters every 6 to 8 weeks during the season and how to clear the space around the condenser before winter.

Grants and administrative support

Fujitsu high-efficiency wall-mounted heat pumps are generally eligible for assistance programs available in Greater Montreal, subject to a compatible AHRI number and confirmed low-temperature performance. AirGreen supports:

• eligibility verification (AHRI sheet, SEER/HSPF, low temperature maintenance);

• preparation of proof of installation ;

• support for submitting applications and inspections if required.

We offer the same support to our clients in Montreal, Laval, Longueuil, on the North Shore and the South Shore .

Best practices and advice for this living space

• Instructions : 23°C during the day, 21°C at night; leave the sweep function active to circulate the air without creating a direct current on the seating areas.

• Doors : Keep the door ajar to reduce temperature differences with the corridor.

• Blinds and curtains : prevent them from sticking to the blower outlet, so as not to disturb the return probe.

• Winter : After each storm, check that the space around the condenser remains clear .

• Spring : Complete cleaning recommended before the heatwave to restore optimal delta-T .

Why AirGreen

Our team works weekly in Outremont and throughout Greater Montreal. We combine load analysis , rigorous HVAC installation and maintenance monitoring , with finishes designed for neat interiors. This project illustrates our approach: short back-to-back path , perfect sealing, instrumented commissioning and immediate comfort... in a room where silence and air quality matter as much as temperature.