Elios ADD-ON Central Heat Pump | Cased Coil | 18000 BTU | -25°C

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A thoughtful ADD-ON approach for existing buildings in Quebec

In the Quebec heating, ventilation, and air conditioning (HVAC) market, one reality is consistently observed: a vast proportion of residential and commercial buildings already have a functional central system, often electric or hybrid. Under these circumstances, replacing the entire system is neither necessary nor optimal from a technical or financial standpoint.

It is precisely to address this reality that the Elios ADD-ON Central Heat Pump | Coils WITH Housing | 18,000 BTU | -25°C was designed. It is an intelligent central solution, designed to integrate directly into an existing installation , while adding high-performance central air conditioning and efficient heating capacity down to -25°C .

At AirGreen , we regularly install this type of ADD-ON system in Montreal , Laval , Longueuil , on the North Shore and the South Shore , in single-family homes as well as in duplexes, multi-unit buildings, and commercial buildings. The Elios 18,000 BTU model is particularly well-suited to the needs of homeowners who want to improve overall comfort without undertaking major renovations .

The ADD-ON principle: an often underestimated technical logic

A well-designed add-on system is not a compromise. It is a coherent HVAC strategy , provided it is correctly selected and installed.

Direct integration into the existing central system

The Elios central coil with housing is designed for direct installation on the existing air distribution network, typically above or downstream of an electric furnace or hybrid heating module. This design allows for:

• to preserve the existing conduits ,

• to limit mechanical modifications,

• to avoid the complete reconstruction of a plenum,

• and to significantly reduce installation times.

In areas like Montreal and Laval , where mechanical rooms are often compact, this boxed format facilitates a clean, structured installation that complies with current HVAC standards.

A smart synergy between existing heating and heat pump

Contrary to some misconceptions, an ADD-ON heat pump does not abruptly replace the existing system. It acts as a primary source of heat when conditions are favorable , and switches to a backup heating system when needed.

In concrete terms:

• Between 0°C and approximately -15°C, the Elios heat pump covers a large part of the heating needs.

• Below these thresholds, the existing electric or hybrid system automatically supplements,

• Comfort remains stable, without sudden temperature variations.

This approach is particularly suited to the variable winters of the North Shore and the South Shore , where cycles of freezing and thawing are frequent.

Actual performance in heating and air conditioning

The ADD-ON Elios 18,000 BTU Central Heat Pump was designed to operate in demanding climatic conditions, not for theoretical temperate climates.

Controlled air conditioning capacity

With a nominal capacity of 18,000 BTU , this model is perfectly suited for:

• medium-sized single-family homes,

• entire floors,

• plex apartments,

• or well-insulated commercial spaces.

Combined with an existing central distribution system, air conditioning is uniform , without overcooled or poorly served areas, provided that the duct network is well balanced — a point we systematically check at AirGreen.

Heating down to -25°C: a real advantage in Quebec

The ability to heat down to -25°C clearly distinguishes this model from many more basic central heat pumps. In practice, this means:

• a real reduction in electricity consumption during the mid-season,

• consistent comfort during moderate cold spells,

• a reduction in wear and tear on the main heating system.

We have observed, during several installations in Longueuil and on the South Shore , that customers notice better thermal stability from the first winter, particularly in multi-story buildings or buildings with open ceilings.

The coil WITH housing: a detail that changes everything

Choosing a coil with a housing is not a trivial matter. It directly influences the quality of the installation, the durability of the system, and the ease of maintenance.

Structured design and waterproofing

The case:

• protects the coil against unwanted air leaks

• ensures optimal sealing

• facilitates mechanical connections

• and allows for precise alignment with the existing plenum.

This results in better overall system efficiency and a reduction in common problems associated with improvised installations.

Dimensions and compatibility

With compact internal dimensions ( 16.13 × 22.53 × 15.78 in. ), the coil fits easily into tight mechanical spaces. The airflow of approximately 1,500 CFM is compatible with most residential and light commercial central air conditioning systems.

The standard 3/8 – 3/4 refrigeration piping also simplifies replacements during upgrade projects.

R-454B refrigerant: performance and future compliance

The choice of R-454B meets a dual requirement:

• reduce environmental impact,

• to ensure compliance with current and future standards.

This next-generation refrigerant offers an excellent balance between energy efficiency and safety. The Elios system is designed for secure integration , with devices compliant with A2L requirements, a crucial aspect in modern installations, both residential and commercial.

Concrete examples of AirGreen installations

Single-family home in Laval – established residential area

In this electrically heated property, the client wanted discreet central air conditioning without modifying the existing infrastructure. The installation of an Elios 18,000 BTU add-on unit enabled:

• uniform air conditioning across two floors

• a measurable reduction in heating consumption during transition periods,

• a discreet level of external noise, appreciated in a dense neighborhood.

Plex in Longueuil – compact mechanical room

In a multi-unit residential building, mechanical space was limited and room for maneuver was restricted. The compact design of the coil with its housing allowed for a clean installation without compromising performance. The owner was primarily looking for a reliable, easy-to-maintain, and durable solution—exactly the type of project where this model excels.

Critical points often overlooked in ADD-ON projects

A high-performing add-on system depends as much on the installation as on the product itself. Over the years, we have identified several common mistakes that we systematically avoid at AirGreen:

• underestimating the importance of the actual airflow of the existing system,

• neglecting the balancing of the ducts after adding the coil,

• ignore the thermal analysis of the building,

• poorly anticipating electrical constraints (MCA, circuit breakers, protections).

For this specific model, the 20 A MOP facilitates integration into many configurations without requiring major electrical upgrades, a tangible advantage in existing buildings.

Reliability, guarantee and peace of mind

The Elios 18,000 BTU ADD-ON Central Heat Pump is designed for long-term reliability. Standard coverage includes:

• 10 years on the compressor ,

• 10-year warranty on parts ,

• with the option to add an additional guarantee , highly recommended for rental and commercial properties.

At AirGreen, we take the time to clearly explain warranty options so that each customer can make an informed choice, without long-term surprises.

Why AirGreen is the right partner for this type of installation

Installing a central ADD-ON system requires a thorough understanding of existing systems , mastery of HVAC standards, and real-world field experience.

At AirGreen , we have over 15 years of experience in HVAC installation in Montreal , Laval , Longueuil , on the North Shore and the South Shore . Our teams are composed of qualified refrigeration technicians, experienced in complex projects, existing buildings and hybrid systems.

We work with:

• transparent pricing ,

• detailed quotes before work begins,

• an approach geared towards the actual sustainability of the facilities

• and a structured after-sales service.

Conclusion

The Elios ADD-ON Central Heat Pump | Coils WITH Casing | 18,000 BTU | -25°C is a central solution perfectly suited to existing Quebec buildings. It allows for the addition of efficient central air conditioning , reduces heating costs during the shoulder seasons, and extends the lifespan of existing systems.

For a personalized analysis, a precise estimate, or a technical visit in Montreal , Laval , Longueuil , on the North Shore or South Shore , contact AirGreen directly. Our team will support you with a technical, honest, and results-oriented approach.