GREE UNIX R410A "ADD-ON" Central Heat Pump | 3T - Cased coil

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A smart, centralized approach, designed for existing Quebec buildings

At AirGreen , we see the same reality every year in Montreal , Laval , Longueuil , and on both the North and South Shores : a vast majority of residential and multi-unit buildings already have a functional central heating infrastructure. Electric or gas furnaces, properly sized ductwork, limited mechanical space, and clear budget constraints. In this context, replacing the entire system is neither necessary nor optimal.

The GREE UNIX R410A 3-tonne “ADD-ON” central heat pump with coil and casing was designed precisely to address this need. It is a central system that doesn't force the building to adapt to the machine, but rather a machine designed to integrate intelligently with the existing structure , while providing real gains in comfort, energy efficiency, and heating stability in cold weather.

A truly useful ADD-ON design for renovation and replacement

The ADD-ON concept is often misunderstood. In practice, this model allows you to add a high-performance central heat pump to an existing system without having to demolish everything.

Specifically, during an AirGreen installation

In several projects carried out in Montreal North , Ahuntsic , Laval West , and Boucherville , we integrated GREE UNIX:

• to an existing electric furnace ,

• to a gas furnace used as a backup ,

• or to an older, but still mechanically sound, central system.

The GCAT36F/NAA coil with housing is designed to fit into the existing air distribution plenum. This allows:

• to preserve the conduits,

• to limit the carpentry and finishing work,

• to reduce installation times,

• and to maintain excellent control of airflow.

For owners of duplexes, triplexes and rental buildings , this approach represents a concrete advantage: less disruption for occupants and a faster return on investment.

A central heat pump designed for real, not theoretical, cold.

One of the major challenges for central heat pumps remains their performance in winter. The GREE UNIX series was developed specifically to maintain significant heating capacity even when temperatures drop sharply.

Measurable and usable heating capacities

For the 3-tonne (36,000 BTU) model:

• Rated power: 36,000 BTU

• Power at -8°C : approximately 26,000 BTU

• Power at -15°C : approximately 23,200 BTU

• stable operation down to -30 °C .

In areas like Mascouche , Terrebonne , or certain more exposed zones on the South Shore , this stability is essential. It allows for a drastic reduction in the use of supplemental heating, which directly translates into a decrease in the annual energy bill.

At AirGreen, we regularly observe that this type of system covers the majority of heating needs during the Quebec winter, with the supplementary heating occurring in a timely and controlled manner.

Energy efficiency consistent with actual central usage

The GREE UNIX ADD-ON is not positioned as a laboratory product, but as a central system designed to operate in real-world conditions.

Indicators of effectiveness

• SEER2 : around 15

• EER2 : approximately 19

• HSPF2 : approximately 8 to 9

• COP at -8°C : around 1.8 to 2.0 depending on the installation

These figures only become truly valuable when combined with a rigorous HVAC installation , which includes:

• airflow adjustment ( CFM ),

• static pressure control,

• checking the tightness of the ducts,

• balancing piece by piece.

A well-balanced central system provides uniform comfort, without cold zones in winter or overheating in summer, which is particularly appreciated in multi-story houses and elongated buildings.

Efficient central air conditioning and real humidity control

In air conditioning mode, the 36,000 BTU capacity is perfectly suited to a wide variety of residential configurations.

Results observed in the field

• Dehumidification : approximately 9.68 pints per hour ,

• maintaining a stable temperature even during heat waves,

• marked reduction in the sensation of heavy air.

In Montreal , where summer humidity is often more uncomfortable than the heat itself, this point is crucial. Several guests have reported a noticeable improvement in nighttime comfort, particularly in upstairs rooms, which are traditionally more difficult to cool.

24V communication: a technical detail that makes all the difference

The standard 24V communication of the UNIX series is a strategic advantage that is often underestimated.

Why this is important for homeowners

• compatibility with most existing wired thermostats,

• easy integration of smart thermostats,

• reduction of electrical work during a replacement.

In several projects in Laval and Longueuil , this compatibility allowed clients to keep a recently installed thermostat, while completely modernizing their heating and air conditioning system.

Controlled noise levels for residential environments

The GUD36W/AD(U) outdoor unit operates at a noise level of approximately 52 dB(A) . In a dense urban environment, this factor is far from negligible.

At AirGreen, we pay particular attention to:

• the precise location of the unit,

• the direction of the air discharge,

• the distance from windows and neighboring properties.

This approach reduces noise pollution and contributes to a harmonious integration of the system, even in very close neighborhoods.

Key technical data for a compliant and sustainable installation

For owners and managers attentive to technical aspects, here are some essential characteristics:

• Voltage : 220 V

• Minimum ampacity (MCA) : 24 A

• Maximum protection (MOP) : 35 A

• Refrigerant : R-410A

• Piping : 3/8 – 3/4

• Interior dimensions (case) : 17.5 x 21.25 x 23 in.

• External dimensions : 32.25 x 18.125 x 37 in

These parameters allow for a safe installation, compliant with standards and compatible with a wide variety of existing mechanical configurations.

In what cases does AirGreen recommend this model?

Based on our field experience, we recommend the ADD-ON GREE UNIX 3T central heat pump when:

• The building already has a network of pipes in good condition.

• The client wants to optimize their budget without sacrificing reliability.

• Priority is given to efficient electric heating.

• Stability at very low temperatures is a key criterion.

It is not a universal solution, but when well chosen and well installed , it offers an excellent balance between cost, performance and durability.

The crucial importance of an AirGreen installation

Even a high-performing central heat pump depends entirely on the quality of its installation. At AirGreen , every project includes:

• a precise analysis of heating requirements,

• a complete inspection of the duct network,

• adjusting the operating parameters,

• clear and structured post-installation follow-up.

It is this rigor that allows our clients in Montreal , Laval , Longueuil , North Shore and South Shore to fully enjoy their HVAC system, season after season.

A well-thought-out central solution for lasting comfort

The GREE UNIX R410A 3-tonne “ADD-ON” central heat pump with coil and casing represents a pragmatic solution, designed for real buildings and real constraints. It integrates, performs, and lasts.

If you are considering upgrading your existing central system or wish to validate the compatibility of your installation with this model, our team is available to assist you.

Contact AirGreen now for a personalized assessment, a detailed quote, and a professional HVAC installation tailored to your needs.