GREE UNIX R410A "ADD-ON" Central Heat Pump | 5T - Cased coil

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A central ADD-ON solution designed for the realities of Quebec buildings

At AirGreen, we work daily with existing buildings whose central heating systems are still functional but have become expensive to operate or insufficient in terms of comfort. The 5-tonne ADD-ON GREE UNIX R410A central heat pump with coil and casing was designed precisely for this type of situation: to radically improve energy performance and comfort without requiring a complete replacement of the central system.

In Greater Montreal, Laval, Longueuil, and on the North and South Shores, a large proportion of homes and buildings already have ductwork and an electric or gas furnace. In these cases, a well-designed ADD-ON solution allows you to optimize the existing system rather than starting from scratch. This is precisely where the GREE UNIX series stands out.

Unlike many traditional central systems, this heat pump doesn't require a complete overhaul of the infrastructure. It integrates seamlessly, reduces installation costs, and allows for a faster return on investment, all while delivering performance suited to Quebec winters.

A technical architecture focused on compatibility and sustainability

ADD-ON concept with integrated coil and housing

The ADD-ON principle is based on a modular and pragmatic approach. The system is composed of:

• of a 60,000 BTU GREE UNIX outdoor unit

• of an internal coil mounted in a robust casing

• with standard 24V communication , compatible with most wired thermostats

This configuration allows the heat pump to be connected directly to the existing ductwork, either upstream or as a supplement to a furnace. At AirGreen, we favor this approach in projects where the ductwork is in good condition and properly sized, as it minimizes structural work while ensuring excellent air distribution.

In several homes in Laval and Boucherville, this type of installation has made it possible to keep the furnace as a backup system, while transferring the majority of the annual heating to the heat pump.

Designed with Quebec's climate in mind.

Quebec's climate places real demands on HVAC systems. Winter temperatures can drop well below -20°C for several consecutive days. The GREE UNIX central heat pump was designed to meet this challenge.

Essential heating characteristics:

• Stable operation down to -30°C

• Power at -8°C: 44,500 BTU

• Power at -15°C: 37,200 BTU

• Nominal capacity: 60,000 BTU (5 tonnes)

In practice, this means the system can provide primary heating for most of the winter, while the existing system only kicks in when conditions become extreme. This hybrid approach is particularly effective in regions like Montreal and the South Shore, where periods of intense cold are often brief but severe.

Energy efficiency and actual operating performance

Performance measured in air conditioning and heating

The energy performance of this central heat pump is consistent with its positioning: reliability, stability and efficiency under real-world operating conditions.

• SEER2: up to 17.0

• EER2: up to 19.52

• HSPF2: up to 9.0

• COP at -8 °C: 11.83

These values ​​translate directly into a significant reduction in annual energy consumption. At AirGreen, we regularly observe a substantial decrease in heating costs for customers who switch to this type of add-on system, particularly when heating was previously provided solely by an electric furnace.

Humidity management and indoor air quality

With a dehumidification capacity of 12.13 pints per hour , this system also helps improve summer comfort. In several projects completed in Longueuil and on the North Shore, occupants have noticed:

• a more uniform temperature between floors

• a reduction in the feeling of humidity

• improved nighttime comfort during heatwaves

The airflow of up to 1,500 CFM ensures efficient distribution throughout the duct network, provided that it is well balanced.

The AirGreen approach: much more than just an installation

in-depth preliminary technical analysis

Before installing any ADD-ON central heat pump, our team systematically performs the following steps:

• a complete assessment of the conduit network

• the measurement of available static pressure

• electrical compatibility check (220 V, MCA 35 A, MOP 45 A)

• analysis of integration with the existing furnace

• validation of pipe lengths and diameters (3/8 – 3/4)

This step is crucial. A common mistake seen in the market is installing a high-performance heat pump on an inadequate ductwork system, which immediately compromises the system's actual efficiency. At AirGreen, we refuse to make this type of compromise.

Concrete example: single-family home in Longueuil

In a Longueuil home built in the 1990s, the client wanted to reduce energy costs without replacing their existing furnace. After analysis, we installed a GREE UNIX ADD-ON 5T with coil and casing , integrated directly into the existing system.

After a full winter:

• The heat pump provided the majority of the heating.

• The furnace only appeared during periods of extreme cold.

• overall energy consumption has decreased

• Thermal comfort remained stable throughout the house

This type of project perfectly illustrates the value of this solution when it is properly sized and installed.

Noise level, robustness and long-term maintenance

Discretion and external integration

With an outdoor noise level of approximately 58 dB(A) , the outdoor unit remains relatively quiet for a system of this capacity. It can be installed near a residence, fence, or shared wall while complying with municipal regulations in most Greater Montreal areas.

Robust design for a long lifespan

The GREE UNIX central heat pump benefits from:

• reinforced steel casing

• variable speed two-stage compressor

• components designed for wide temperature ranges

• R-410A refrigerant , proven and widely available

Like any central HVAC system, regular maintenance remains essential. At AirGreen, we offer maintenance plans tailored to ADD-ON systems to maintain performance, extend lifespan, and prevent costly breakdowns.

Who is this central heat pump really intended for?

This model is particularly suitable for:

• to single-family homes with existing furnace

• to residential buildings with central ducts

• to light commercial buildings

• for owners wanting a reliable hybrid solution

• to projects where reducing work is a priority

It is less suitable for buildings without ducts or for projects requiring multi-zone control, where other HVAC solutions would be more appropriate.

Why choose AirGreen for this type of project?

At AirGreen, we don't sell a device: we design a complete HVAC solution , adapted to the building, the climate and the actual habits of the occupants.

In practical terms, this means:

• A rigorous technical analysis is required before any recommendation is made.

• a clear and final offer before the start of the work

• certified and experienced technicians

• strict adherence to RBQ standards

• a local, accessible and responsive after-sales service

Our team operates daily in Montreal, Laval, Longueuil, on the North Shore and the South Shore, with in-depth knowledge of the region's residential and commercial buildings.

Conclusion

The ADD-ON GREE UNIX R410A 5T central heat pump with coil and casing represents a well-considered, reliable, and efficient solution for modernizing an existing central system without unnecessarily increasing its complexity. It offers a solid balance between winter performance, summer comfort, and seamless integration with existing systems.

To find out if this model is suitable for your building, to obtain a detailed analysis, or to receive a personalized quote, contact AirGreen directly . Our team will support you every step of the way to implement a sustainable, consistent, and perfectly tailored HVAC solution.