GREE FLEXX R410A “ADD-ON” Central Heat Pump | 4T - Cased Coil

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A central solution designed for Quebec's climate and smart HVAC renovations

The ADD-ON GREE FLEXX R410A 4-tonne central heat pump with cased coil is perfectly suited to the realities of residential buildings in Quebec. It was designed to address two major challenges we encounter daily at AirGreen : the harsh winter climate and the need to modernize existing central systems without turning the project into a major and costly construction undertaking.

In many projects in Montreal , Laval , Longueuil , and on the North and South Shores, homeowners want to improve their comfort, reduce their energy costs, and access available subsidies, all while retaining part of their existing HVAC infrastructure. This is precisely where the ADD-ON concept comes in. This central heat pump integrates with an existing forced-air system, often accompanied by an electric furnace or supplemental heating, to create a hybrid solution that is efficient, flexible, and sustainable.

With a rated output of 48,000 BTU , heating capacity maintained down to -30°C and advanced inverter modulation, the GREE FLEXX 4T stands out as a serious solution for medium to large-sized residences, including single-family homes, duplexes and some small residential buildings.

A measurable, consistent performance adapted to extreme cold

Actual heating and cooling capacity

In practice, what truly sets the GREE FLEXX central heat pump apart is its ability to maintain stable performance when temperatures drop. Unlike many conventional central systems that rapidly lose efficiency below zero, this model continues to provide significant heat output, greatly reducing reliance on supplemental heating.

The technical data clearly illustrates this reality:

• Cooling capacity : 48,000 BTU

• Heating capacity at -8°C : 44,000 BTU

• Heating capacity at -15°C : 41,000 BTU

• SEER2 : 16.03

• HSPF2 : 9.015

• COP at -8 °C : 1.83

In projects completed by AirGreen in Laval and on the South Shore, this capability allows the heat pump alone to cover the majority of winter heating needs, while ensuring a smooth transition to supplemental heating during periods of extreme cold. The result is consistent comfort , without sudden temperature fluctuations, and better-controlled electricity consumption .

Inverter technology and intelligent modulation

The inverter technology integrated into the GREE FLEXX plays a central role in this performance. The compressor continuously adjusts its speed according to the actual thermal load of the building. This precise modulation allows:

• to avoid short cycles,

• to limit mechanical wear,

• to reduce peak electricity consumption,

• to maintain a stable and uniform internal temperature.

In the multi-storey homes we service in Montreal and Longueuil , this stability translates into a significant reduction in temperature differences between the basement and upper levels, a problem frequently reported with older central systems.

R-410A refrigerant and compatibility with existing installations

Choosing R-410A refrigerant remains a particularly relevant option for HVAC renovation projects. It ensures excellent compatibility with many existing systems still in operation in Quebec. For building owners, this means fewer structural modifications, faster integration, and better control over overall project costs.

The standardized and proven 3/8 – 3/4 piping also facilitates installation work in sometimes restricted mechanical spaces, particularly in older Montreal homes or compact buildings on the North Shore.

Air distribution, comfort and interior quality

Airflow and thermal balance

With an airflow of approximately 1,150 CFM , the GREE FLEXX 4T ducted coil provides efficient and even air distribution throughout the ductwork. This flow rate is particularly well-suited for large homes or buildings with multiple zones served by a single central system.

During AirGreen projects in Boucherville and Laval, this flow rate made it possible to correct existing imbalances, particularly in homes where some rooms remained difficult to heat or cool with the old equipment.

Humidity management and summer comfort

The dehumidification capacity of 9.94 pints per hour significantly improves indoor comfort during the summer. In many areas of Montreal and the South Shore, where humidity can become oppressive during hot weather, this feature contributes to a more natural feeling of coolness, without over-cooling.

Proper dehumidification also helps protect interior materials, reduce mold growth, and improve overall indoor air quality.

The ADD-ON concept: flexibility and energy strategy

An ideal approach for HVAC modernization

The ADD-ON format is not a universal solution, but it becomes extremely relevant in very specific contexts:

• gradual replacement of an electric furnace,

• optimization of a still functional central system,

• integration of a heat pump without immediately removing the existing heating system,

• ensuring comfort during extreme cold.

At AirGreen, we recently completed an installation in Laval where the client wanted to keep their electric furnace as a backup. The GREE FLEXX heat pump now provides primary heating down to approximately -22°C, resulting in a significant reduction in energy bills and peace of mind during the coldest periods.

Noise levels and urban constraints

With an outdoor noise level of approximately 58 dB(A) , this central heat pump stands out for its quiet operation. In the dense residential neighborhoods of Montreal or Longueuil, this is far from a minor consideration. It facilitates compliance with neighbors and municipal regulations, while also improving the daily experience of residents.

The side discharge design of the outdoor unit also allows for greater installation flexibility, particularly in tight spaces, along a wall or in a side yard where a traditional unit would be difficult to position.

Dimensions and mechanical integration

The dimensions of the ducted coil ( 24.5 x 21.25 x 57 inches ) make this model compatible with most existing mechanical rooms. During our technical assessments, we pay particular attention to this aspect, especially in older buildings in Montreal and Longueuil where space is often limited.

This compatibility reduces structural adjustments and accelerates project implementation.

Reliability, durability and guarantees

The 12-year warranty on the compressor and parts testifies to the system's robustness. At AirGreen, we systematically support our customers through the necessary steps to activate and maintain this protection, an often overlooked but essential long-term aspect.

It is also possible to add an extended warranty , depending on your needs and the type of installation. Even though labor is not included by default, our rigorous approach, based on proven procedures and precise sizing, significantly reduces the need for future interventions.

In the field, properly installed GREE FLEXX systems have an excellent track record of reliability, both in residential HVAC installations and in light multi-unit configurations.

Subsidies and return on investment

Eligibility for the LogisVert provincial grant , currently valued at $5,280 , represents a significant financial advantage for this central heat pump. For many homeowners on the North and South Shores , this assistance transforms an ambitious HVAC project into a reasonable and predictable investment.

In a recent project carried out by AirGreen in Boucherville, the financial analysis demonstrated that, including the subsidy, the system could be amortized in less than six years, while increasing comfort, energy performance and the overall value of the property.

AirGreen expertise at the heart of every installation

Choosing AirGreen isn't just about choosing high-performance equipment. It's about relying on a team that understands the unique climatic, architectural, and energy realities of Quebec. We never offer a GREE FLEXX ADD-ON central heat pump without:

• a detailed analysis of thermal loads,

• a complete inspection of the ductwork network,

• a realistic assessment of the role of supplemental heating,

• precise planning of the installation.

Our numerous projects in Montreal , Laval , Longueuil , on the North Shore and the South Shore demonstrate that a well-designed ADD-ON central system offers an optimal balance between performance, flexibility and cost control.

Take the next step with AirGreen

To obtain a personalized quote , confirm the compatibility of your installation, or schedule a complete HVAC analysis , contact AirGreen directly. Our experts will guide you through every step, from the initial assessment to commissioning, with a clear, structured, and results-oriented approach.