GREE UNIX R410A "ADD-ON" Central Heat Pump | 4T - Cased coil

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A central heat pump designed for Quebec winters… and for existing buildings

At AirGreen , we never select equipment based solely on a technical specification sheet. Every heat pump we offer must first prove itself in the field , in real homes, with real constraints: existing ductwork, older buildings, varying needs between floors, and above all, a demanding Quebec climate .

The GREE UNIX R410A 4-tonne “ADD-ON” central heat pump with coil and casing is one of those systems that precisely addresses this reality. It wasn't designed for ideal theoretical conditions, but to operate stably, predictably, and efficiently in Montreal, Laval, Longueuil, and on the North and South Shores , even when temperatures plummet.

This is a robust, centralized solution, designed for owner-occupiers as well as property investors and multi-unit managers who are looking for a clear balance between performance, adaptability and sustainability .

The “ADD-ON” concept: a concrete solution for HVAC renovations

In practice, a large proportion of the buildings we serve already have:

• of a functioning electric furnace ,

• from an existing central conduit network ,

• or from an old central system that has become energy-intensive.

The GREE UNIX ADD-ON concept allows for the integration of a high-performance heat pump without unnecessarily dismantling existing systems . This approach is particularly relevant in established neighborhoods of Montreal and Laval, where major modifications are costly and sometimes complex.

Concrete benefits observed on our construction sites

• Significant reduction in demolition work

• Preservation of the existing conduit network

• Faster and better controlled installation

• Fewer unforeseen structural problems

• Optimizing the overall project budget

In a recent project in Longueuil, the ADD-ON configuration allowed for a complete modernization of the heating and air conditioning in a duplex, while retaining the electric furnace as a backup. The result: significantly improved comfort and reduced energy consumption, without altering the building's structure.

A 4-tonne capacity suitable for large areas

With a nominal capacity of 48,000 BTU , this central heat pump is suitable for large areas:

• large single-family homes,

• multi-story cottages,

• apartment buildings,

• buildings requiring a sustained airflow.

Unlike undersized systems that we still see too often, the GREE UNIX 4T makes it possible to maintain a homogeneous temperature throughout the building, even when some areas are more exposed or more difficult to heat.

Reliable central heating down to -30°C

Heating is the critical element for any heat pump installed in Quebec. This model is distinguished by:

• Stable operation down to -30 °C

• Power at −8 °C: 39,000 BTU

• Power at −15 °C: 33,600 BTU

• COP at −8 °C: 11.83

On the North Shore, where winds and nighttime cooling exacerbate heat loss, we have found that this heat pump maintains consistent performance without excessively relying on supplemental heating. This directly translates into better control of electricity costs during the winter.

Efficient and balanced central air conditioning

In summer, the 48,000 BTU cooling capacity allows for:

• uniform cooling across multiple stages

• effective humidity management,

• longer and more stable cycles.

Seasonal performance (SEER2 and EER2) ensures constant comfort even during episodes of intense heat and humidity that we are experiencing more and more often in Montreal and on the South Shore.

The dehumidification of 9.94 pints per hour plays a key role here: it improves perceived comfort without forcing an excessive drop in temperature, which reduces wear on the system and unnecessary consumption.

Coil with casing: optimal integration into the duct network

The coil with casing is a central element of this configuration. It allows a smooth transition between the outdoor unit and the existing air distribution network.

Important technical points

• High airflow exceeding 1,500 CFM

• External static pressure suitable for long or complex conduits

• More even air distribution between rooms

• Compatibility with multiple central configurations

In a multi-unit residential building in Boucherville, this static pressure made it possible to effectively balance ducts of unequal lengths, reducing temperature differences between units.

Standard 24V communication: flexibility and simplicity

24V communication is an often underestimated but crucial long-term advantage. It enables:

• the use of standard central thermostats,

• easy integration with smart thermostats,

• simplified maintenance, without complex proprietary components.

For our customers, this means more freedom in choosing controls and less dependence on specific parts.

Robust design and integrated protections

The UNIX series was developed to withstand intensive operating conditions:

• Intelligent defrosting to limit efficiency losses

• Self-diagnostic system facilitating service

• Reinforced steel outer casing

• Wide thermal operating range

• Complete compressor protection

These characteristics are essential to ensure long-term reliability, particularly in residential settings where heating outages in winter are unacceptable.

Controlled noise level

With an outdoor noise level of approximately 58 dB(A) , this heat pump remains quiet for its class. In the dense residential areas of Montreal and Laval, this aspect is often crucial for respecting the immediate environment and the neighborhood.

Subsidies and investment strategy

Depending on the final configuration and applicable programs, this model may be eligible for certain provincial subsidies , particularly under the LogisVert program. At AirGreen , we analyze each application individually in order to:

• maximize available aid,

• to avoid unpleasant surprises,

• structure the project in a coherent manner.

We also emphasize the importance of accurate sizing . A 4-tonne central heat pump must match the building's actual needs. An incorrect choice will lead to either overconsumption or a loss of comfort.

AirGreen's expertise: a determining factor

Installing an ADD-ON central heat pump is not simply a matter of plugging in components. The final quality depends on:

• thermal analysis of the building,

• of airflow balancing,

• of the electrical configuration,

• thermostat calibration,

• detailed commissioning.

At AirGreen , we offer:

• Proven field expertise in Montreal, Laval, Longueuil, North Shore and South Shore ,

• experienced, certified refrigeration technicians

• $5 million liability insurance ,

• a transparent and structured approach, with a clear offer before work begins.

A central heat pump designed to last

The GREE UNIX R410A 4T “ADD-ON” central heat pump with coil and casing is designed for homeowners seeking a reliable, adaptable central solution truly suited to Quebec's climate. It combines power, stability, installation flexibility, and lasting comfort without unnecessary compromises.

Speak to an AirGreen expert

For a personalized assessment , an analysis of your existing system , or a detailed quote for a central HVAC installation in Montreal, Laval, Longueuil, on the North Shore or South Shore, contact AirGreen directly. Our team will provide you with comprehensive support, from the initial diagnosis to final commissioning.