4-season comfort for a ground floor room under renovation, with short run, gravity drain and clean finishes
At AirGreen , we are working on a ground floor apartment with access to the backyard, a large patio door , and work in progress (carpentry, yard leveling). The client's objective: to stabilize the temperature of an open room, exposed to solar gains in the summer and losses through glazing in the winter, without taking up floor space. We recommend a recent Sharp ZU1 wall-mounted heat pump ( R-32 ), known for its quiet operation and performance in extreme cold .
Location choice: top of wall near the patio door
The indoor unit is installed under the ceiling , at the corner of the exterior wall, above the existing return vent. This location offers:
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a single outward, inclined drilling for the gravity drain ;
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a short length of connections , estimated between 2 and 3 meters to the condenser in the rear yard;
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a diffusion of air that passes through the room without blowing directly on the occupants.
We validate the clearances around the hood and bypass the recessed spotlight in the ceiling to avoid any recirculation of hot air against the plenum.
Key steps in HVAC installation
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Protection of the area (tarpaulins, wall corners), then laser tracing for a perfectly level installation.
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Wall support anchored in the structure; verification of center distances and loads.
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Drilling Ø ~65 mm with outward slope for gravity drainage.
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Passage of insulated copper refrigeration connections , communication cable and drain ; cladding in UV/frost resistant exterior capping .
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Nitrogen test (leak) and deep vacuum < 500 microns to dry the circuit.
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Electrical connection on dedicated circuit in accordance with code; identification on panel.
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Commissioning : pressure/temperature control, adjustment of sweep and setpoint , explanation to the user.
Why the Sharp ZU1 wall-mounted heat pump here?
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Versatility : additional heating in winter, efficient air conditioning in summer with effective dehumidification .
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High efficiency thanks to R-32 refrigerant and inverter compressor.
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Quiet operation suitable for living areas.
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Simple maintenance : washable filters, direct access to the condensate tray for HVAC maintenance .
Depending on the capacity chosen ( 9,000 to 18,000 BTU depending on the load calculation), the ZU1 series ensures stable comfort and measurable energy savings throughout the year.
Technical details and finishes observed
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Shutters oriented to project the flow along the ceiling then to the center of the room: better range and temperature uniformity.
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Gravity drain fixed every 60 cm , outlet with water drop to avoid marks on the coating.
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Discreet exterior capping , elbows sealed with neutral silicone, stainless steel screws.
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Condenser in progress, offered on brackets or on a platform outside the snow line to limit the suction of powder and facilitate snow removal.
Sizing: the AirGreen method
We carry out a load calculation taking into account:
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the orientation of the room and solar gains via the patio door,
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the type of glazing and infiltrations ,
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of the usable surface area and ceiling height ,
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internal gains (devices, occupants).
This approach avoids oversizing (short cycles, less efficient dehumidification) and undersizing (noise, setpoint not reached).
Developed for optimal comfort
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Summer: vertical scan activated, auto speed during the day, low in the evening.
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Winter: more horizontal sweeping to promote initial stratification then gentle destratification .
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Recommended guidelines: 23–24°C for air conditioning, 21–22°C for heating for living areas.
Recommended maintenance
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Clean filters every 4–6 weeks during use.
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Washing of batteries and disinfection of the tank : annual.
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Drain inspection when the snow melts and before a heatwave.
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Refrigeration check (pressure switches, subcooling/superheating) every 24 months depending on usage.
Grants and Eligibility
The new generation wall-mounted heat pump may be eligible for certain programs (depending on the capacity , certified yields and low temperature performance of the chosen configuration). We support our customers in Montreal , Laval , Longueuil , on the North Shore and South Shore to verify the criteria and prepare the file .
Pitfalls avoided thanks to our expertise
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Drilling without slope : risk of backflow, avoided by our template and level control.
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Obstacle in blowing (ladder, furniture, curtains): we validate the jet zone before final fixing.
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Lines too long : short route design to limit load losses and preserve the COP .
Result for the customer
The room gains immediate thermal stability and better humidity control. The system remains discreet , easy to use and ready for both extreme heat and bitter cold. With AirGreen, the HVAC installation is clean, documented (photos, measurements, advice) and supported by a recurring HVAC maintenance service .
AirGreen in Greater Montreal
Our teams cover the Southwest , Rosemont–La Petite-Patrie , Ville-Marie , Laval , Longueuil , the North Shore and the South Shore . We combine diagnosis , installation and monitoring to guarantee lasting comfort and long-term savings.