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GREE UNIX R32 "ADD-ON" Central Heat Pump | 2T | Coil in a Box

A central solution designed for Quebec's climate and existing systems

The GREE UNIX R32 | 2T | Coil-in-Casket "ADD-ON" Central Heat Pump is a particularly relevant central HVAC solution for homes in Greater Montreal , Laval , Longueuil , the North Shore , and the South Shore . At AirGreen, we frequently recommend it when homeowners want to improve their energy efficiency, reduce their reliance on fossil fuels, and optimize their comfort, while retaining part of their existing system.

Unlike complete replacements, which often require extensive work, this ADD-ON type central heat pump allows for seamless integration with an existing furnace, whether electric or gas. This approach addresses a widespread problem in Quebec: solid, well-maintained buildings whose heating systems no longer meet current energy performance standards.

The ADD-ON principle with a coil in a box: a pragmatic approach

Adapt rather than demolish

In many homes in Montreal and Laval , the ductwork is in good condition, as is the central furnace. The problem lies not in the air distribution, but in the heating source itself. The ADD-ON concept allows for the addition of a high-performance central heat pump upstream of the existing system using a box-type coil , which acts as the primary heat exchanger.

This coil is inserted directly into the central system's casing. It allows the heat pump to heat or cool the air before it is distributed throughout the house. The result: a seamless transition between electric heating, heat pump heating, and, when needed, supplemental heating from the existing furnace.

Concrete benefits observed in the field

At AirGreen, we observe several immediate benefits after installing this type of configuration:

• Significant reduction in heating costs on an annual basis

• Improved thermal stability between parts

• Fewer on/off cycles, therefore less mechanical wear.

• Faster and less intrusive work for the occupants

On the South Shore , many of our clients have been able to keep a functional furnace while drastically reducing their overall energy consumption. This flexibility explains why this model is particularly popular in homes built between 1980 and 2005.

Heating performance: designed to withstand winter

A central heat pump truly adapted to cold weather

The GREE UNIX R32 2-tonne central heat pump is not a theoretical solution or limited to temperate climates. It was designed to offer stable performance even during the periods of intense cold we experience in Quebec.

From a practical point of view, this means:

• Functional heating capacity down to -30°C

• Rated power of 24,000 BTU

• Power output maintained at -15°C: 24,000 BTU

• Power at -8°C: 15,000 BTU

• High coefficient of performance even in winter conditions

In several installations carried out in Longueuil and on the North Shore , the heat pump covers almost all heating needs during the winter, with the furnace serving only as a safety net during exceptionally cold periods.

Measurable energy efficiency

In terms of efficiency, this model demonstrates solid values ​​that are consistent with current expectations:

• SEER2: 16.03

• HSPF2: 8.5

• EER2: 11.02

• COP at -8 °C: 11.83

This data translates concretely into controlled electricity consumption, better conversion of energy into useful heat and eligibility for provincial subsidy programs, notably LogisVert , which represents a significant financial lever for many owners.

Internal technology and sustainability-oriented design

Two-stage compressor and intelligent modulation

At the heart of the central heat pump is a two-stage, two-cylinder compressor combined with advanced modulation technology. Unlike older systems with binary operation, this approach allows the power output to be adjusted according to the building's actual needs.

In practice, this means:

• Fewer sudden temperature changes

• Quieter and more stable operation

• A reduction in peak electricity consumption

• Extended component lifespan

In urban areas like Montreal , where acoustic comfort is an important criterion, this operational stability makes a real difference on a daily basis.

R-32 refrigerant: a choice consistent with current challenges

R-32 is now recognized for its superior energy efficiency and reduced environmental impact compared to previous generations of refrigerants. It allows for a smaller charge, better thermal efficiency, and a more responsible overall footprint.

For customers sensitive to environmental issues, particularly in certain areas of Laval and Longueuil , this technical choice is part of a coherent approach, without compromising on performance.

Built-in security and peace of mind

The boxed coil is equipped with a refrigerant leak detection system. This safety feature, often absent in older installations, contributes to occupant protection and long-term system reliability. It's a technical detail, but it reflects a design focused on durability and compliance with current standards.

HVAC Installation: The Key Role of AirGreen Expertise

Each building is unique

Even with high-quality equipment, results depend directly on the installation. At AirGreen, we systematically analyze:

• The actual volume to be heated and cooled

• The required airflow (up to 1,500 CFM depending on the configuration)

• The condition and dimensions of existing conduits

• Power supply (220 V, MCA 28 A , MOP 30 A )

• Compatibility with the existing or replacement thermostat

In Montreal , it's not uncommon to find undersized or modified ductwork systems, often resulting from renovations. In these situations, our approach is to adjust the configuration to maintain efficiency and prevent noise or performance losses.

Common mistakes avoided through experience

With ADD-ON systems, certain errors can compromise the results:

• Incorrect positioning of the coil in the casing

• Inadequate condensate drainage

• Poor communication between the heat pump and the furnace

• Thermostat misconfigured or incompatible

Our team relies on proven procedures, derived from numerous installations carried out on the South Shore and the North Shore , to avoid these problems and ensure optimal operation from the moment of commissioning.

Acoustic comfort and discreet integration

With an outdoor noise level of approximately 60 dB(A) , the GREE UNIX R32 central heat pump integrates well into dense residential environments. This is particularly appreciated in urban areas where close proximity to neighbors imposes additional constraints.

Inside, the modulated operation and the quality of the installation contribute to a more uniform air distribution, without excessive whistling or unwanted vibrations.

Why entrust your project to AirGreen

Choosing AirGreen means opting for a structured and transparent approach:

• Realistic technical assessment tailored to your building

• Clear and final submission before work begins

• Qualified and experienced technicians in central HVAC installation

• $5,000,000 liability insurance

• Comprehensive support for available subsidies

Whether your project is located in Montreal , Laval , Longueuil , on the North Shore or the South Shore , our objective remains the same: to deliver a reliable, sustainable solution perfectly adapted to your real needs.

Next Step!

Are you considering installing a GREE UNIX R32 | 2T | Coil-in-Cabin "ADD-ON" Central Heat Pump, or do you want to confirm the compatibility of this model with your existing system? Contact AirGreen directly for a complete assessment, clear advice, and a professional HVAC installation.

Telephone: 514-316-2973
Email: sales@airgreen.ca