A condo construction site where precision, silence and aesthetics guide every decision
At AirGreen , we regularly work in condos in downtown Montreal , where space, noise, and aesthetic constraints require careful HVAC installation . This project in Le Sud-Ouest illustrates our method: careful reading of the premises, selection of suitable Sharp wall-mounted equipment (ZU1 series) , and clean execution for a high-performance, discreet, and durable result.
Context: urban loft, concrete ceiling and interior partition
The apartment features an exposed concrete ceiling and painted interior partitions, typical of a loft . The wall-mounted header was positioned at the very top of the wall , near the ceiling-wall angle and above a door frame. This configuration provides excellent air diffusion in the main room, while freeing up useful wall space. However, it imposes three technical requirements:
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Respect the clearances above and around the indoor unit to avoid any air recirculation.
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Condensate drain management despite an interior wall – priority to gravity operation if possible, or integration of a silent mini-lift pump if the route to the exterior requires it.
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Elegant routing of refrigerant connections and communication cable to the outdoor unit, without impacting the aesthetics of the condo.
Equipment selected: Sharp ZU1, precision comfort and high performance
For this type of urban condo, the Sharp ZU1 series wall-mounted heat pump is a sure bet thanks to its silence , fine modulation and stable performance in cold weather typical of Montreal.
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Type: wall-mounted heat pump (mini-split, one zone)
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Recommended capacity: 9,000 to 12,000 BTU/h depending on thermal load (surface, glazing, orientation, sealing)
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Typical efficiencies: high SEER/SEER2 and HSPF/HSPF2, inverter technology to maintain the temperature as precisely as possible and limit consumption
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Noise level: very low in low and medium mode – essential in co-ownership
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Compatibility: Wi-Fi controller available, frost protection functions, night and dehumidification modes
In AirGreen projects in urban housing, the ZU1 stands out for its stable regulation at low speed, homogeneous air diffusion and controlled operating costs , summer and winter.
Path study: from the living room to the balcony, without visual compromise
1) Implantation of the inner head
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Height : mounting as close as possible to the ceiling (concrete), ensuring minimal stratification and optimized air distribution.
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Clearances : respect sufficient lateral space in relation to the return of the wall and the door lintel to avoid turbulence .
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Fixing : wall plate anchored in the structure; out-of-plumb control to prevent vibrations and parasitic noise.
2) Condensate drain
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Priority option : continuous gravity slope to the shortest external drilling.
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Alternative option : mini-lift pump with a duct if the wall is internal or if the external outlet point is higher than the tank. We prefer pumps < 21 dB(A) at nominal speed, mounted on silent blocks and equipped with an alarm contact (anti-overflow safety).
3) Refrigerant connections and power supply
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Route : along the upper rail , in discreet white capping , then through drilling towards the outside.
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Piping : Insulated copper, controlled bend radius to preserve the inverter; anti-vibration collars at changes of direction.
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Electrical : Communication cable between units and dedicated power supply conforming to the gauge indicated by the manufacturer; approved circuit breaker.
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Waterproofing : the hole is filled and sealed (fire/air barrier foam + UV exterior sealant) in order to preserve the building envelope.
4) Outdoor unit
In this type of building, the outdoor unit is generally installed on the balcony :
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Support : anti-vibration pads on slab or low support, set back from traffic areas.
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Clearances : free at the discharge and suction, in order to maintain seasonal efficiency and compressor longevity.
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Winter management : raising wedges, snow guards if exposed, and ice clearance to ensure flow in defrost mode.
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Nuisances : optimization of night mode and fan speeds; orientation of the discharge to limit reverberation on the walls.
AirGreen Site Challenges and Responses
Concrete ceiling: no bleeding, therefore impeccable surface
Exposed concrete eliminates the need for technical grooves. We then design a controlled, visible path : straight capping, clean angles, and regularly spaced fasteners. The result is understated and goes unnoticed after just a few days of use.
Interior wall and adjacent door: precision to the millimeter
The proximity of the door requires an opening template to avoid any interference with the supply air damper. Our installation respects this envelope so that the air sweeps the room without blowing directly on the occupants.
Condensates and co-ownership: zero tolerance for leaks
In co-ownership, the slightest leak of condensate is unacceptable. We test the watertightness , validate the slope, and, when a mini-pump is required, we provide vibration traps , acoustic foam and discreet maintenance access .
Execution steps (AirGreen method)
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Validation of thermal load and target BTU capacity .
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Laser installation of the wall plate, checking clearances.
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Drilling Ø65 to Ø75 mm, sleeve and air-cutting treatment .
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Routing of connections, controlled bending , protection by capping .
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Nitrogen brazing or flare fittings calibrated to the prescribed tightening torque .
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Deep vacuum (< 500 microns), leak test , then gassing according to the actual length.
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Start-up and calibrations : probe, scanning, hot/cold modes, simulated defrost test if required.
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Discount : usage tips, filters, night mode, HVAC maintenance plan .
Result: four-season comfort and controlled costs
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Summer : a wall-mounted air conditioner that cools without harsh drafts, even in heat waves.
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Mid-season : precise dehumidification, ideal for the air quality of a loft.
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Winter : heat pump that supports the main heating and reduces the electricity bill thanks to the inverter.
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Silence : contained noise levels, dampened vibrations , respect for the neighborhood.
Recommended maintenance for longevity
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Clean filters every 4 to 8 weeks during periods of heavy use.
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Annual inspection : exchanger, turbine, tank and drain (or pump), electrical tightening, pressure and subcooling/overheating.
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Hygiene : mild biocide treatment if there are odors or dusty environments.
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Winterization : checking the clearance of the outdoor unit, visual inspection of the connections.
Regular HVAC maintenance maintains efficiency, lowers noise and extends compressor life .
Practical advice for condominiums in Montreal, Laval, Longueuil, North Shore and South Shore
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Co-ownership declaration regulations : validate the location of the outdoor unit, work schedules, aesthetic requirements (color of the capping, alignments).
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Drillings : obtain authorization for envelope penetrations; favor air and vapor barrier sealing to preserve the building's energy performance.
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Noise management : aim for < 45 dB(A) at the nearest reception point on the common facade; direct the discharge and install anti-vibration pads .
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Grants : Certain high-efficiency, Energy Star-certified wall-mounted heat pumps are eligible under current programs; we advise our clients on eligibility and the administrative process.
What makes the AirGreen difference
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Careful reading of the site before drilling: we avoid surprises in concrete structures.
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“Almost invisible” paths : straightness of the cappings, colorimetry and clean finishes.
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Fine calibration : torque, vacuum, load compensation to the nearest gram.
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After-sales service : local availability throughout Greater Montreal for maintenance, diagnosis and repair.
Frequently Asked Questions (short version)
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Is a mini pump noisy? Current models are very quiet; when properly disconnected and maintained, they remain inaudible during normal use.
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And in winter? The ZU1 maintains good efficiency down to low temperatures; sufficient clearance around the outdoor unit guarantees defrosting performance.
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How long does it take to install? In condos, most projects are completed in one day , including testing and user training.
Conclusion
This installation in Le Sud-Ouest demonstrates how a Sharp wall-mounted heat pump (ZU1 series) , cleverly installed in a loft with a concrete ceiling , provides comfort, silence and savings all year round. With AirGreen, the customer benefits from careful execution , compliant with co-ownership rules and ready for simple maintenance, a guarantee of sustainability .
Areas served: Montreal, Laval, Longueuil, North Shore and South Shore . For a clear quote and installation without surprises, contact AirGreen .