Installation of a Sharp wall-mounted heat pump in Rosemont–La Petite-Patrie
Installation of a Sharp wall-mounted heat pump (Eco Inverter, Plasmacluster) on a flat roof in Rosemont–La Petite-Patrie : aluminum support on beams, covered route and roof waterproofing. Sustainable HVAC installation by AirGreen .
Take a tour of the installation
Each number is a point we check on site. Switch between summer and winter to watch air and heat move.
In summer, the outdoor unit rejects the house's heat outside.
Generic illustration of this type of installation, not a survey of this job site. Tap a number.
Mounted level on a wall plate, high enough for the air to reach the whole room, with enough space around it to slide the filters out easily.
The refrigerant lines, the communication cable and the drain go through the wall in a single opening, sealed against water, cold air and insects.
Two insulated copper pipes connect the two units. Outside, a line cover can protect them from sun, knocks and weather.
A shut-off switch near the outdoor unit isolates it safely for service. It must stay accessible at all times.
The compressor and the fan. In heating mode it captures heat from the outdoor air, even in winter, and moves it inside.
On the ground or on the wall, it keeps the unit above accumulated snow. The unit stays clear and defrost water can drain away.
The fan needs to blow freely. Storage, a fence or a wall too close, and efficiency drops while noise goes up.
Context: a rooftop condenser, zero compromise on waterproofing
At AirGreen , we were called in to equip a Rosemont–La Petite-Patrie home with a Sharp wall-mounted heat pump . The building has a flat gravel roof , typical of Montreal. The client wanted a quiet , economical , and reliable system in winter , without weighing down the facade or encroaching on the courtyard. The solution was obvious: installing the condenser on the roof , with supports that protect the membrane, and a clean, sealed refrigeration path to the interior wall header.
Why Sharp (ZU range) ?
Sharp 's Eco Inverter series is distinguished by:
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an inverter compressor that finely adjusts power, synonymous with energy savings and stable comfort ;
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Ion Plasmacluster technology (Sharp trademark) which improves indoor air quality ;
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a recent wall-mounted design operating with new refrigerants and adapted to the low temperatures of Greater Montreal .
In terms of usage, this means: efficient heating in the off-season and in winter , gentle and even cooling in summer, and low noise levels both indoors and outdoors — a crucial point in dense neighborhoods like Rosemont .
Visible installation details and key technical choices
We place the Sharp condenser on a raised aluminum support , itself resting on two treated wooden sleepers (beams) firmly fixed. This assembly:
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distributes the load on the gravel and prevents any perforation of the membrane ;
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provides sufficient ground clearance against snow accumulation and puddles;
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limits vibrations transmitted to the structure thanks to the wood/aluminum interposition.
The refrigeration path is protected by a white UV cover from the indoor unit to the roof (insulated copper connections + communication cable + power supply). In this type of building, we favor a short and straight path , with sealed passages at the crossings (walls/ceiling/roof). The total length is generally in a range of 7 to 12 m , perfectly compatible with the refrigerant charges of the range.
As for condensate drainage , we operate by gravity when the interior configuration allows it (natural slope), otherwise we integrate a silent mini-condensate pump that is accessible for maintenance.
Implementation steps — AirGreen method
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Preliminary checks
Analysis of the roof structure , the condition of the membrane , the surveys and flows . Survey of distances and heights from the future interior head. Identification of the electrical source and routing to the dedicated circuit breaker . -
Installation of supports
Assembly of the aluminum frame and wedging on treated beams . Installation of anti-vibration pads/spacers if required. Orientation of the condenser to free the blower and respect the clearances : free suction at the rear, clear blowing at the front. -
Drilling & sealing
Clean, small-diameter drilling for refrigeration connections, sheathing of the crossings, sealing with roof-compatible materials (mastic/flashing), then visual inspection and testing . -
Refrigeration connections
Flares compliant , tightening torque controlled, vacuum pumped to reach a deep vacuum level, leak test and commissioning according to the manufacturer's procedures. -
Electrical connection
Dedicated power supply with circuit breaker and proximity disconnect , grounding, polarity and cable section control. -
Calibration & testing
Power up, heating/cooling tests , checking currents , blowing temperatures , communication between units, control instructions and explanations to the customer.
Results: comfort, silence and aesthetics
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Immediate comfort : the temperature rise/fall is rapid and stable thanks to the inverter .
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Silence : the wall head operates at a low noise level in regulation, while the condenser, far from the facades and decoupled by the roof support, limits structural noise .
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Aesthetics : the white casing remains discreet on the facade; on the roof, the condenser is perfectly plumb and aligned for a professional look.
What we monitor on a Montreal flat roof
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Snow and wind : We plan the height of the support to avoid burial and ensure air intake . In very exposed areas, we may recommend a wind deflector or snow guard .
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Drainage : The condenser should never sit in an area of stagnant water .
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Maintenance access : clearances respected for cleaning batteries and diagnostics .
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Vibration : tightening, locknuts , and pads adapted to the wood/aluminum support.
Recommended maintenance (to maintain performance)
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Internal filters : regular cleaning to maintain air flow .
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Batteries (inside and outside): periodic dusting and gentle washing .
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Clearances : Keep the outdoor unit free of debris , especially after high winds.
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Annual inspection by our technicians: leak and charge check, electrical check, firmware update if applicable.
Regular maintenance ensures high yields , controlled energy bills and optimal longevity .
Energy performance & subsidies
Sharp 's latest wall-mounted heat pumps offer high efficiency in both heating and cooling. Depending on the selected BTU capacity and the low temperature operating range , the installation may be eligible for efficiency grants or programs (e.g., provincial and local initiatives). Our team systematically checks the eligibility of the selected model and supports the customer throughout the process (documents, proof of installation, certification numbers).
Sizing: the right BTU, no more
At AirGreen , we size the power (BTU) from:
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the surface area and insulation of the accommodation;
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from solar exposure and air infiltration ;
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occupation habits and possible support from other systems.
This approach avoids oversizing , which causes short cycles , noise and overconsumption , and guarantees constant comfort .
Pitfalls to Avoid (and How We Get Around Them)
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Leaky holes : on roofs, this is a no-go. We apply a proven roofing method (compatible materials, flashings, visual inspection and testing).
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Supports placed directly on the membrane : risk of abrasion . We interpose beams and frames and, depending on the membrane, suitable soles .
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Minimum clearances ignored : The Sharp condenser requires precise suction/discharge clearance . We check these dimensions before any final tightening.
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Oversized or poorly insulated refrigeration lines : performance losses, condensation. We adhere to the prescribed diameters and use UV-resistant closed insulation under the hood.
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Improvised condensate management **: we favor gravity ; failing that, a quality, silent pump , installed with anti-vibration and access .
Advice for owners in urban areas
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In co-ownership , notify the union : location, access route, work schedules . We provide you with technical sheets and implementation plans .
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For rented apartments , inform your tenants of the intervention periods . Our teams work with cleanliness and tight deadlines .
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In preparation for winter: Keep the perimeter around the condenser clear of snow, ice, and objects. Leave the unit in heat mode as instructed; avoid repeated power outages .
Why AirGreen ?
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HVAC specialists in Greater Montreal (Montreal, Laval , Longueuil , North Shore , South Shore );
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Controlled roof installations : waterproofing, supports, safety;
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Turnkey service : sizing, subsidies , installation, commissioning , HVAC maintenance .
The result: a Sharp wall-mounted heat pump that is well integrated into the urban life of Rosemont–La Petite-Patrie , ready to deliver efficient heating in winter and coolness in summer, with a durable installation that respects the building.
Quick Facts (Summary)
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Type : Sharp wall-mounted heat pump , Eco Inverter , Ion Plasmacluster
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Installation : flat gravel roof , aluminum support on wooden beams
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Route : connections under white cover , sealed crossings, typical length 7–12 m
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Objectives : 4-season comfort , silence , aesthetics and durability of the roof
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Maintenance : filters, batteries, clearances, annual AirGreen inspection
Need a similar installation?
We operate throughout Montreal , Laval , Longueuil , the North Shore and the South Shore . Our team guides you from the choice of machine to commissioning , with transparent support on performance , maintenance , and savings achievable.
Keywords : heat pump , wall-mounted air conditioner , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore , Sharp , Eco Inverter , Plasmacluster , flat roof , aluminum support .
The big day, step by step
The main steps of this kind of job at AirGreen. Every house has its quirks: the estimate brings them out.
We look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
Model, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
Floors and furniture protected, wall plate position marked level, wall opening located.
A single opening, with the slope the drain needs to flow outside.
Set on a stand raised above the snow, with the clearances the manufacturer requires.
Connected, insulated and protected. The opening is then sealed against water, cold air and insects.
A dedicated circuit and an accessible disconnect near the outdoor unit.
Leak test, vacuum, then start-up and a check of heating and cooling.
Remote, modes, filters: we show you the essentials before we leave.
- The on-site estimateWe look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
- The quoteModel, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
- Getting readyFloors and furniture protected, wall plate position marked level, wall opening located.
- The wall openingA single opening, with the slope the drain needs to flow outside.
- The outdoor unitSet on a stand raised above the snow, with the clearances the manufacturer requires.
- Lines, cable and drainConnected, insulated and protected. The opening is then sealed against water, cold air and insects.
- The electrical workA dedicated circuit and an accessible disconnect near the outdoor unit.
- Tests and start-upLeak test, vacuum, then start-up and a check of heating and cooling.
- The walkthroughRemote, modes, filters: we show you the essentials before we leave.
What would it look like at your place?
Two quick checks with real numbers: what heat costs, and what your current heaters add up to in BTU/h.
Conversion: 1 W = 3.412 BTU/h. An indication, not a load calculation: baseboards and furnaces are often stronger than the real need, and they can stay as backup. AirGreen confirms the capacity on site.
Four mistakes we do not make
Flip each card to see what we do instead.
Your own project, step by step
What to do, season by season
Three habits per season for this unit. They take a few minutes and prevent many calls.
- Clean the indoor unit's filters.
- Clear leaves and debris left on the outdoor unit by winter.
- Test cooling before the first hot days.
- Clean the filters more often when the unit runs a lot.
- Keep plants away from the outdoor unit.
- Check that no water drips from the indoor unit.
- Rake the leaves around the outdoor unit.
- Test heating before the first cold days.
- Book periodic maintenance before winter.
- Keep snow away from the stand and the front of the unit.
- Let the unit defrost: it is normal.
- Never hit the ice on the fins; call us if the unit stays iced up.
Is your home ready?
Check what applies at your place. A "no" is not a refusal: it is what we sort out during the estimate.
Four statements: true or false?
It all comes down to details you have just seen.
1. In heating mode, the outdoor unit can produce water.
During defrost cycles. That water must drain away without forming ice.
2. You pick the capacity with a simple square-footage rule.
Windows, insulation, orientation and how the room is used all count. Capacity is chosen on site.
3. A multi-zone connects several indoor heads to a single condenser.
One head per room, all on the same condenser. Each room keeps its own temperature.
4. The disconnect can sit behind the patio furniture.
It must stay accessible: it is what shuts the unit off for service.
0 / 4 right answers
What people ask us about this kind of work
Does a wall-mounted heat pump heat in winter?
Wall-mounted or multi-zone: how do I choose?
Where does the outdoor unit go?
Are there grants?
Do I need a permit?
How cold can it heat?
How much can I save?
How is the LogisVert assistance calculated?
Is it noisy?
The outdoor unit is covered in ice: is that normal?
Does AirGreen hold the required licences?
Is the estimate free?
No question matches. Write to us: we answer.
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Each dot: a town where AirGreen has published projects. The glowing dot: this job.
Every house has its constraints. We see them before we install.
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Text and photo: a real AirGreen Climatisation & Chauffage job. The diagrams are generic illustrations of the type of installation, not a survey of this job site. Sources of the added figures: airgreen.ca product pages (NEEP / AHRI performance), Hydro-Québec (Heat pumps page, LogisVert, read on 13 October 2026), Régie de l’énergie (rate D as of 1 April 2026).