Why this Montréal company replaced its central heating system with a Gree multizone heat pump?

An energy transition project in Montréal: a strategic choice for comfort and savings

In Montréal, switching from a traditional central heating system to a Gree multizone heat pump is more than just a technological upgrade—it’s a strategic decision that transforms day-to-day comfort, optimizes energy consumption, and lowers operational costs. At AirGreen, we recently supported a local business in making this decisive shift toward a modern, efficient, and subsidized HVAC solution, perfectly adapted to the climate realities of Greater Montréal.

Context: a commercial building in search of energy performance

This Montréal-based company, located in a two-story office building in the Rosemont–La Petite-Patrie neighborhood, was using a central forced-air gas heating system. Despite regular maintenance, energy bills remained high, comfort levels varied greatly from room to room, and temperature control was becoming increasingly difficult—especially during seasonal changes.

Our AirGreen team was contacted to design a custom multizone HVAC solution, one that would be more efficient, flexible, and environmentally friendly.

Why choose a Gree multizone heat pump?

We proposed a Gree multizone heat pump, a strategic choice for its numerous advantages:

• Inverter technology that continuously adjusts power output based on real-time demand in each room.

• Multizone compatibility allowing up to 5 indoor wall-mounted units to connect to a single outdoor unit.

• Exceptional energy efficiency with a seasonal energy efficiency ratio (SEER) above 21.

• Uses R-32 refrigerant, which is more environmentally responsible.

• Effective heating down to -30°C, ideal for Québec winters.

• Eligible for LogisVert grants of up to $4,600, depending on the configuration installed.

Technical details of the installation completed in Montréal

Selected brand and model:

• Gree Free Match multizone heat pump

• 36,000 BTU outdoor unit

• Four indoor wall-mounted Gree Lomo 2nd generation units (9,000 BTU x 2, 12,000 BTU x 1, 18,000 BTU x 1)

Project specifics:

• The installation took three days, scheduled to respect the company’s operating hours.

• Zero downtime thanks to our meticulous planning and phased approach.

• Integration in enclosed offices, a meeting room, a reception area, and a server room requiring stable temperature.

• Refrigerant lines routed through existing drop ceilings for a discreet and aesthetically pleasing installation.

Challenges and tailored solutions

1. Uneven thermal insulation

Some rooms were poorly insulated, which affected overall system performance. We adjusted BTU capacity per zone and installed individual thermostats for more precise control.

2. Minimal ambient noise required

The executive office was adjacent to the outdoor unit. We installed the heat pump on anti-vibration pads and added a sound barrier to minimize noise transmission.

3. Air circulation in an IT room

Precise control was critical in the server room. We configured a dedicated unit in permanent cooling mode, with reinforced drainage to prevent excess condensation.

Results: thermal comfort, savings, and client satisfaction

A few weeks after installation, feedback from the client has been excellent:

• Estimated 42% reduction in annual energy bills.

• Improved comfort across all areas of the building, year-round.

• Independent temperature control, increasing employee satisfaction.

• Return on investment expected in less than 5 years, factoring in the grants received.

Why trust AirGreen for your multizone heat pump installation in Montréal?

At AirGreen, we do more than sell equipment. We design custom HVAC systems, tailored to your building’s layout, room usage, budget, and specific expectations.

Our certified installers are highly experienced with the technical specifics of Gree multizone heat pumps, and our administrative team assists with obtaining government grants, including Hydro-Québec’s LogisVert program.

We’re proud to support the energy transition of commercial buildings across Montréal, Laval, Longueuil, as well as the North Shore and South Shore.

Our advice before replacing your central heating system

Before installing a multizone heat pump, here are a few important considerations:

1. Thermal analysis of the building: a precise evaluation ensures proper sizing of each unit.

2. Number of zones to cover: each room or space requiring independent temperature control will need its own wall unit.

3. Model selection: not all multizone heat pumps are created equal. Gree models stand out for their price-performance ratio and reliability.

4. Grant eligibility: get clear guidance from experts like us to navigate the available incentives.

5. Installation planning: work with a team that respects your operations and scheduling constraints.

AirGreen: your partner for peak HVAC performance

When you choose AirGreen, you benefit from:

• A turnkey service: evaluation, quote, installation, setup, grants.

• Support from certified, experienced technicians.

• Energy-efficient solutions designed for Québec’s climate.

• Responsive after-sales service, including preventive maintenance plans.

Whether you’re a business looking to optimize energy use or a property owner aiming to improve year-round comfort, a Gree multizone heat pump is a forward-thinking solution. And with AirGreen, you can count on professional, transparent, and efficient support at every stage.