Replace an old unit with a modern, quiet and efficient solution
At AirGreen , we often see older wall-mounted units that have served us well, but no longer offer the efficiency, comfort, or reliability expected today. In this project in Chomedey, Laval , our mission is clear: remove an old beige wall-mounted head (non-inverter, yellowed plastic, limited local controls) and replace it with a new generation Fujitsu wall-mounted heat pump , designed for our Quebec winters. The intervention takes place during interior work (doors removed, finishing in progress), which allows us to optimize the routing of connections and deliver an HVAC installation that is clean, efficient, and durable.
Context: Limits of the old installation
The existing unit shows several classic signs of end of life:
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Yellowed plastic and continuous grid typical of older non-inverter series.
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Rudimentary local control and imprecise air distribution.
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Likely first generation R22/R410A refrigerant and low seasonal efficiency compared to current requirements.
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Refrigerant connections housed in an adjacent partition, with visible pipes (corrugated gray sheath, white PVC drain) and crossing above a door opening : a route which requires compliance with standards.
The owner wants to gain comfort , reduce energy costs and benefit from a quiet device with precise temperature control and connectivity .
Recommended device: Fujitsu wall-mounted heat pump, cold climate range
We offer a Fujitsu wall-mounted heat pump (capacity adapted to the room - generally 9,000 to 12,000 BTU for a main zone), equipped with:
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an inverter compressor for fine modulation,
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stable heating down to -25°C (cold climate range),
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very low noise levels both inside and outside,
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improved filtration for healthier air,
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Wi-Fi compatibility via dedicated module for remote planning and management,
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high SEER/HSPF ratios , eligible for current grant programs .
This selection ensures an optimal balance between performance in winter, gentle air conditioning in summer and long-term reliability .
Key steps of the AirGreen intervention
1) Protection, removal and safe recovery
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Protection of surfaces and marking of the work area .
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Recovery of refrigerant from the old unit according to environmental standards.
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Careful removal of the inner head, temporary plugging of the holes to prevent dust and humidity.
2) Review of the route of the lines
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Inspection of the existing path : the photo reveals a vertical passage in the adjacent partition (grey sheath) and a PVC drain .
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We optimize routing :
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New refrigerant lines (typically 1/4 – 3/8 for 9-12 k BTU) with high density insulation.
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Brazing under nitrogen and pressure testing (≈ 300 psi) to ensure watertightness.
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Retained gravity drain or compact condensate pump if the minimum slope (≈1%) is not ensured.
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Discreet interior capping in the same color as the walls when the opening does not allow for complete recessing.
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3) Structured drilling and finishing
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A single hole at the correct diameter with bulkhead and sleeve to prevent any friction.
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Interior/exterior urethane or silicone HVAC caulking for air and water sealing.
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Resumption of gypsum and moldings in coordination with the client's work in order to obtain an aesthetic and uniform facade.
4) Power supply and compliance
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Check the dedicated circuit (often 15 A or 20 A depending on the size of the appliance) and the external cut-off to the condenser.
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Upgrade the circuit breaker at the panel if required, according to the AWG wiring prescribed by the manufacturer.
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RBQ/CSA compliance and applicable electrical codes .
5) Vacuum, charge and setup
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Vacuumed to ≤ 500 microns , nitrogen breaks and vacuum resistance control.
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Opening valves , checking superheat/subcooling parameters .
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Remote control configuration , heating and air conditioning tests, airflow balancing (orientation of the flaps) and, if chosen, pairing of the Wi-Fi module .
Site-specific installation details
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High installation height (head positioned at the top of the wall, above embrasures). This promotes correct stratification and wide diffusion in the open area.
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Crossing over an opening : we add internal metal supports and a clean profile to stiffen the section, avoid vibrations and guarantee the finish.
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Lines hidden in the neighboring partition (storage side) to purify the main room .
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Drainage to the existing fall; in the event of a risk of reverse slope during freezing periods, integration of a silent condensate pump with anti-vibration block and anti-odor loop .
Results: comfort, silence and savings
After commissioning, the customer benefits from:
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consistent comfort without the jolts of an old on/off switch,
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significantly reduced noise (interior and exterior),
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lower energy consumption thanks to inverter modulation,
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precise control (time programming, eco modes and intelligent defrosting),
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careful visual integration : no visible ducts in the living area.
Grants and Eligibility
Fujitsu 's high-efficiency cold climate wall-mounted heat pumps are generally eligible for subsidies in Quebec (e.g., LogisVert ). Our team supports the customer in:
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validate eligibility based on BTU, SEER/HSPF and low temperature heating range ;
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gather proof of installation (photos, detailed invoices, approval numbers);
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submit the application in order to maximize financial assistance and reduce the net cost of the project .
Maintenance and longevity: our recommendations
To maintain performance :
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Clean filters every 4–8 weeks during the season.
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Annual inspection : coil, fan, tray and drain (rinse/disinfect).
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Electrical check (tightenings, circuit breaker, external box), residual vacuum check and pressure reading if abnormal behavior.
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Clearances: Maintain ≥ 12 in. around the head and ≥ 18–24 in. around the condenser for optimal air intake .
Regular HVAC maintenance ensures stable performance , extended lifespan and preserves the warranty .
Why AirGreen for your project in Laval and Greater Montreal?
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On-site technical assessment and rigorous sizing (thermal load, height, route, electricity).
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Installations certified by teams specializing in wall-mounted heat pumps .
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Careful execution : brazing under nitrogen, pressure tests, deep vacuum, clean finish.
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Turnkey service : advice, subsidies, monitoring and maintenance plan .
Our approach aims for lasting comfort , real savings and impeccable aesthetics — essential criteria for residences in Montreal, Laval, Longueuil, North Shore and South Shore .
Conclusion
This replacement of an old wall unit with a Fujitsu heat pump in Chomedey (Laval) demonstrates the immediate impact of a well-designed HVAC installation : silence , thermal stability , reduced consumption and clean integration even in a renovation project. With AirGreen, you get a complete upgrade that enhances your home and your comfort—in all seasons.