Elios ADD-ON Central Heat Pump | Uncased Coil | 18000 BTU | -30°C

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A central ADD-ON approach designed for existing buildings and the Quebec climate

At AirGreen, we have been installing ADD-ON central systems for many years in very real-world situations: existing homes with a still-functional electric furnace, hybrid buildings, gradual conversions to full electrification, or properties where mechanical space is limited. The Elios ADD-ON Central Heat Pump | Cabinetless Coils | 18,000 BTU | -30°C fits perfectly into this real-world scenario that we encounter every week in Montreal , Laval , Longueuil , and on the North and South Shores .

This system was not conceived as a theoretical or universal solution, but rather as a product designed to integrate intelligently into existing installations. The choice of a cabinetless coil is far from insignificant: it addresses space constraints, ceiling height limitations, and duct configurations that we regularly observe, particularly in the basements of houses built between 1990 and 2010.

The objective is clear: to significantly improve thermal comfort and energy efficiency, without imposing heavy or costly work that is not always necessary.

The ADD-ON concept explained in concrete terms

A heat pump that is added, rather than replaced

A central ADD-ON system is designed to complement an existing installation. Unlike a complete central system, which often requires replacing the furnace or indoor unit, the ADD-ON principle allows a heat pump coil to be added directly to the ductwork.

In practice, this means:

• Retention of the existing electric furnace.

• Addition of a high-performance central air conditioning system.

• Intelligent use of the heat pump for heating, with automatic switchover to backup when required.

For many homeowners in Longueuil or Laval , this approach represents an excellent compromise between performance, costs and respect for the existing structure.

Why a coil WITHOUT a cabinet actually changes the installation

The cabinetless coil offers remarkable flexibility during installation:

• It integrates more easily into plenums that are already in place.

• It helps to avoid complete duct reconstructions.

• It reduces clearance constraints in cramped mechanical rooms.

In several AirGreen projects on the North Shore , this configuration made it possible to carry out the installation without modifying the structure of the ventilation network, while respecting the airflows necessary for optimal performance.

Actual heating performance: a top priority in Quebec

Reliable heating down to -30°C

One of the most important criteria for our customers is heating capacity in very cold weather. The ADD-ON Elios 18,000 BTU Central Heat Pump is designed to operate efficiently down to -30°C , a particularly relevant threshold for Quebec winters.

In practical terms, this translates to:

• A nominal capacity of 18,000 BTU .

• Heating power maintained at -15°C and -8°C , without a sudden drop in efficiency.

• A smooth transition to supplemental heating when conditions require it.

During a recent installation in Boucherville , a homeowner reported a marked reduction in the use of his electric furnace within the first few weeks, while maintaining a stable temperature throughout the house.

Inverter technology and intelligent modulation

Inverter technology allows the compressor to continuously adjust its speed. Unlike traditional on/off systems, this modulation offers:

• Improved temperature stability.

• More consistent electricity consumption.

• A reduction in wear and tear on mechanical components.

In the long term, this translates into a more sustainable system and more predictable operating costs.

Central air conditioning: uniform comfort and humidity control

In cooling mode, the 18,000 BTU capacity is perfectly suited for well-insulated single-family homes or medium-sized dwellings. The high airflow ensures even distribution of cool air throughout all rooms served by the ducts.

The benefits observed among our clients in Montreal include:

• A marked reduction in temperature differences between floors.

• Better control of indoor humidity.

• Increased comfort during heat waves.

In several cases, the simple installation of this ADD-ON system has eliminated the need for additional portable or wall-mounted air conditioners.

Essential technical data for an informed choice

Key specifications to consider

Before any installation, we always analyze the following parameters:

• Capacity : 18,000 BTU (1.5 tonnes)

• Minimum heating temperature : -30 °C

• Refrigerant : R-454B

• SEER2 : 16.1

• HSPF2 : 8.2

• COP at -8 °C : approximately 2.7

• Outdoor noise level : approximately 58 dB(A)

• Piping : 3/8 – 3/4

• Power supply : 208–230 V, single phase

This data is never interpreted in isolation: it is always related to the building, the insulation, the ductwork and the customer's consumption habits.

R-454B refrigerant: a responsible and sustainable choice

R-454B is among the refrigerants with a low environmental impact. For our customers, this means:

• Compliance with current and future standards.

• Better long-term value for the system.

• Increased safety thanks to integrated leak detection.

This type of refrigerant is particularly relevant for owners concerned about sustainability and regulatory compliance.

AirGreen field feedback: what we've learned in the long term

Examples of typical installations

In Rosemont , in a duplex with a recently installed electric furnace, the Elios ADD-ON system was installed without modifying the existing ductwork. The result:

• Installation completed in a single day.

• Costs kept under control.

• Immediate improvement in comfort, both summer and winter.

In Laval , in an intergenerational home, the cabinetless coil made it possible to adapt the system to a non-standard plenum, avoiding costly reconstruction work.

Common mistakes to avoid

With this type of system, certain errors can compromise performance:

• Incorrect airflow sizing.

• Inadequate positioning of the coil.

• Lack of balancing after installation.

At AirGreen, each installation is followed by a complete check to ensure that the heat pump is operating under optimal conditions.

Subsidies, energy efficiency and long-term profitability

Eligibility for LogisVert

This model is eligible for the LogisVert grant , with an amount of up to $1,824 , depending on the configuration. We support our clients at every stage: eligibility verification, documentation, and administrative follow-up.

Consumption and observed savings

Thanks to inverter modulation and the overall efficiency of the system, our customers generally observe:

• A decrease in electricity consumption related to heating.

• Greater stability in monthly bills.

• A reduction in the use of auxiliary heating.

Why AirGreen Makes a Difference

Entrusting your project to AirGreen means benefiting from:

• With recognized expertise in central HVAC installation .

• Experienced refrigeration technicians, specializing in ADD-ON systems.

• $5,000,000 in liability insurance.

• Clear prices, confirmed before the start of work.

Our approach is based on analysis, transparency and adaptation to each building, whether it is located in Montreal , Laval , Longueuil , on the South Shore or the North Shore .

Conclusion

The Elios ADD-ON Central Heat Pump | Cabinetless Coils | 18,000 BTU | -30°C represents a particularly suitable solution for existing buildings in Quebec. It combines cold-climate performance, installation flexibility, and energy efficiency, while respecting the real-world constraints of residential and multi-unit properties.

For a personalized assessment , a clear estimate, or to verify compatibility with your existing installation, contact AirGreen directly. We will take the time to analyze your situation and offer you a tailored, sustainable solution perfectly aligned with your objectives.