A multi-zone heat pump installation that truly tested our expertise
At AirGreen, we’re used to successfully completing complex HVAC installation projects across Montreal, Laval, Longueuil, the North Shore, and the South Shore. Our team has deep experience installing multi-zone heat pumps in residential, commercial, and multi-unit buildings. But sometimes, despite meticulous planning, a project turns out to be far more challenging than expected. Today, we’re sharing one of our toughest job sites – a real lesson in adaptability, resilience, and customer service.
A project that looked simple on paper, but was filled with obstacles on-site
This was a semi-detached two-storey residential property in Boucherville, on Montreal’s South Shore, where the client wanted to install a multi-zone heat pump by Gree, model Free Match Multizone, with three indoor wall-mounted units (9,000, 12,000, and 18,000 BTU) and one 36,000 BTU outdoor compressor. The goal: deliver optimal year-round thermal comfort to the upstairs bedrooms, the living room, and the basement.
Technically, this installation appeared fairly standard. But from our first on-site visit, several complications emerged.
Unforeseen structural constraints
Upon arrival, we noticed that the exterior walls were made entirely of fieldstone, making the routing of refrigerant lines extremely difficult. The home’s structure also prevented direct access between floors via interior conduits.
Our technicians had to completely rethink the installation plan. The wiring, refrigerant lines, and drainage tubing all had to run outside along the back of the building, requiring the addition of specialized thermal-resistant protective casings to maintain both aesthetics and energy efficiency.
A major electrical surprise
When connecting the indoor units, our master electrician discovered that the home's electrical panel dated back to the 1970s and no longer met modern standards. The available electrical load was insufficient to support a multi-zone heat pump system.
As a result, we had to plan a full upgrade of the panel to 200 amps, coordinating with Hydro-Québec for a temporary power interruption. This setback added two extra days to the job and forced us to reshuffle our installation schedule.
A compressor that refused to start
Once everything was connected and the system tested, one final issue arose: the compressor wouldn’t start. After a thorough check, we identified a defect in the original circuit board of the outdoor unit. Fortunately, thanks to our preferred partnership with Gree, we received a replacement part shipped within 24 hours.
How we turned this nightmare into a success story
Faced with these challenges, our team remained calm, proactive, and focused on client satisfaction. Here’s how we managed to resolve each issue effectively:
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Structural adaptation: We designed a custom installation plan using reinforced mounting, insulated lines, and clean exterior covers for the piping.
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Electrical compliance: Working with our certified master electrician, we upgraded the electrical panel to ensure long-term safety and code compliance.
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Quick compressor repair: Thanks to our responsive after-sales service, we replaced the main board at no extra cost to the client, under full warranty.
The final result: a fully functional multi-zone installation
After six intense workdays – instead of the initially planned three – the client now enjoys a high-performance, quiet, energy-efficient multi-zone heat pump system, covered by Hydro-Québec’s LogisVert grant of $2,380.
Every room in the home now reaches a stable and comfortable temperature, year-round, with minimal energy use and zero noise.
Lessons learned and practical tips from this job site
Never underestimate the initial site evaluation
Even if a project seems straightforward, an on-site inspection is essential to detect any structural or electrical specifics that could impact the installation process.
Choose a certified and experienced company
At AirGreen, our expertise helped us avoid costly mistakes, secure the installation properly, and find creative solutions without compromising quality.
Always plan for unexpected costs
Surprises like an electrical upgrade can lead to extra costs. A flexible budget helps avoid unnecessary stress when unforeseen issues arise.
Expect responsive after-sales support
Thanks to our priority parts and warranty service, we acted fast to fix the compressor without further delays.
Why this type of installation is still a great choice
Despite the challenges, a multi-zone heat pump remains one of the best heating and cooling solutions for multi-level homes or spaces with zoned comfort needs. It allows you to:
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Control temperature independently in each room.
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Reduce energy losses.
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Maximize comfort without needing multiple outdoor units.
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Take advantage of government financial incentives for more affordable energy transitions.
AirGreen: Tailored HVAC solutions, no matter the complexity
This job was one of the most demanding of our year, but also one of the most rewarding. It reflects our commitment to quality, transparency, and customer satisfaction, even when things don’t go as planned.
We continue to provide multi-zone heat pump installations across the Greater Montreal Area, with a personalized approach, certified technicians, and thorough follow-up before, during, and after each project.