ELIOS R410A "ADD-ON" Central Heat Pump | 3T - Cased Coil

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A central heat pump designed for Quebec buildings and existing systems

At AirGreen, we work daily with buildings that have a history: single-family homes built in the 70s and 90s, Montreal duplexes and triplexes, apartment buildings with central electric or dual-energy systems, and well-designed ductwork but with equipment that has become energy-intensive or limited. The ELIOS R410A “ADD-ON” central heat pump – 3 tons with boxed coil – was designed precisely for this type of situation.

This is not a generic central system, but an HVAC solution designed to be intelligently integrated into an existing installation, respecting the building's mechanical constraints while tangibly improving comfort, energy efficiency, and overall property value. This "add-on" approach is fundamental: it avoids unnecessary major work and allows for a gradual, controlled, and cost-effective modernization.

In several projects carried out in Montreal , Laval and Longueuil , we have found that this type of approach meets exactly the expectations of owners who want a high-performance system, but without a complete rebuild of the central mechanics.

An add-on solution designed for smart replacements

The majority of requests we receive for this type of product are for replacements: old central electrical systems, aging heat pumps, or dual-energy systems that no longer meet current standards. In these cases, the ELIOS ADD-ON central heat pump allows for full utilization of an existing duct network while integrating modern technology.

The boxed coil is a key component. Unlike open or improvised coils, this configuration ensures clean integration within the plenum, minimizes heat loss, and simplifies long-term maintenance. In several installations on the South Shore , this design allowed us to improve air distribution without modifying the ductwork, while ensuring a seamless transition between the heat pump and the existing backup system.

This type of solution is particularly appreciated in buildings where mechanical space is limited or already optimized.

Actual heating performance down to -30°C

In Quebec, actual heating capacity remains the decisive factor. The ELIOS R410A 3T central heat pump is designed to operate efficiently in harsh climatic conditions, with heating capacity maintained down to -30°C .

With a rated capacity of 36,000 BTU , it offers a solid low-temperature capacity: approximately 27,400 BTU at -8°C and over 31,000 BTU at -15°C , covering a wide range of average-sized homes when a proper load calculation is performed. At AirGreen, we emphasize this step, because a high-performing central system always begins with a thorough thermal analysis of the building.

In several homes located on the North Shore , this model has made it possible to considerably reduce the use of supplemental heating during periods of extreme cold, while maintaining a stable and consistent indoor temperature.

Inverter technology and continuous modulation

The inverter technology integrated into the ELIOS central heat pump allows for precise and gradual modulation of power. Rather than operating in abrupt cycles, the compressor continuously adjusts its capacity according to the actual needs of the building.

In practical terms, this translates to:

• a more stable temperature throughout the rooms,

• a reduction in peak electricity consumption ,

• reduced mechanical wear on the components,

• quieter operation , both indoors and outdoors.

In single-family homes in Boucherville and Saint-Bruno , several clients have mentioned an immediate improvement in comfort, particularly in areas far from the main plenum, where temperature variations were previously more pronounced.

Energy efficiency and measurable cost reduction

In terms of energy efficiency, the ELIOS 3-tonne central heat pump boasts solid performance: a SEER2 of approximately 15.5 , an HSPF2 of around 8 , and a COP greater than 2.4 at -8°C . These values ​​translate into real savings on the annual electricity bill, especially when replacing direct electric systems.

For a homeowner in Laval , previously equipped with a conventional central electric system, the installation of this ADD-ON heat pump resulted in a significant decrease in heating costs from the first season, while also making the project eligible for the $3,288 LogisVert provincial grant .

This type of concrete feedback confirms the value of this model for projects focused on real performance rather than theoretical promises.

Compatibility with electrical and dual-energy systems

One of the major advantages of the ELIOS ADD-ON central heat pump lies in its integration flexibility . It adapts equally well to all-electric systems and existing dual-energy configurations. The indoor unit can optionally accommodate auxiliary electric heating elements, enabling intelligent management of the energy transition based on outdoor temperature or current tariffs.

In several projects carried out on the South Shore , this approach has made it possible to maintain a functional dual-energy mode while significantly increasing the share of heating provided by the heat pump, which optimizes both comfort and operating costs.

Acoustic comfort and exterior integration

Acoustic comfort is often underestimated when choosing a central system. With an outdoor noise level of approximately 61 dB(A) , the ELIOS 3T central heat pump is significantly below the average for traditional central systems.

In dense urban areas of Montreal , this aspect is particularly appreciated: less disturbance for occupants, but also for the neighborhood. Inside, the inverter modulation contributes to a quieter sound environment, without sudden starts or excessive vibrations.

HVAC Installation: The Details That Make the Difference

Even the best equipment depends on the quality of its installation. For this type of ADD-ON central heat pump, our team pays particular attention to:

• the dimensions and length of the refrigeration piping (3/8 – 3/4),

• strict adherence to electrical parameters ( MCA 30A, MOP 50A ),

• the sealing of the plenum around the boxed coil,

• precise balancing of airflow (CFM) in the existing network,

• the compatibility of the thermostat and the control system.

Our experience has shown us that problems attributed to this type of system rarely stem from the product itself, but rather from improper installation. That's why we approach each ADD-ON project as a custom job.

Guarantee and long-term vision

The 10-year warranty on the compressor and parts provides a reassuring foundation for homeowners. An additional warranty can be added, which we often recommend for rental properties or primary residences where long-term reliability is a key consideration.

This approach helps to secure the investment and reduce unforeseen events over the system's lifecycle.

Why AirGreen is the right partner for this system

Choosing AirGreen for the installation of an ELIOS ADD-ON central heat pump means benefiting from:

• with proven field expertise in HVAC ,

• with an in-depth knowledge of the realities of Montreal, Laval, Longueuil, the North Shore and the South Shore ,

• clear and final submissions , without surprise adjustments,

• structured support for grant applications ,

• of an accessible and consistent after-sales service.

We recommend this system because we know it in depth, we install it regularly and we measure its real results in the field.

Conclusion

The ELIOS R410A | 3T “ADD-ON” central heat pump – Box Coil – represents a well-considered, high-performance HVAC solution adapted to Quebec buildings. It allows for the optimization of an existing installation, improves annual comfort, and reduces energy costs, without undertaking unnecessary major renovations.

For a personalized analysis , a precise load calculation , or a detailed quote , we invite you to contact AirGreen Heat Pumps, Air Conditioning & Heating directly. Our team will take the time to assess your building and offer you a solution truly tailored to your situation.