CANAIR 4CDH R-454B Central Heat Pump "ADD-ON" | 3T - Cased Coil

• BROCHURE

A central heat pump truly suited to Quebec's existing buildings

At AirGreen Climatisation & Chauffage, we have been installing ADD-ON central heat pumps for many years in very concrete settings: existing homes with an electric furnace, step-by-step energy renovations, multi-unit buildings, urban plexes and buildings where indoor or outdoor space is tight. The CANAIR 4CDH R-454B "ADD-ON" Central Heat Pump | 3T fits exactly into this field reality.

This is not a system designed only for new construction or ideal layouts. It is a central solution designed to modernize an existing system intelligently, without tearing everything out or starting over. Its side-discharge outdoor unit, heating down to -30°C and ADD-ON architecture make it particularly relevant for the housing stock of Montreal, Laval, Longueuil, the North Shore and the South Shore, where homes and buildings often come with very real technical constraints.

Reliable winter heating, even in deep cold

Measurable performance when the temperature drops

The CANAIR 4CDH R-454B | 3T is ENERGY STAR® cold climate certified. According to NEEP data for this system (AHRI 216621492), it delivers:

• Rated capacity of 36,000 BTU

• Heating at -8°C: 29,200 BTU/h (COP 2.5)

• Heating at -15°C: 36,000 BTU/h (COP 1.9)

• Heating at -30°C: up to 28,600 BTU/h (COP 1.61)

• HSPF2 (region IV): 9.4

In practice, the system keeps producing useful heat even when outdoor temperatures plunge; in deep cold, the furnace's electric element covers the share that is missing. The use of electric backup heat is reduced, which helps keep consumption steadier.

Steadier heat, without abrupt cycles

Thanks to inverter technology, the compressor continuously adjusts its speed to the building's real needs. This modulation gives:

• A more stable indoor temperature

• Fewer abrupt on/off swings

• More even comfort in every room

• Less mechanical wear over the long term

For owners of multi-storey or open-concept homes, this stability is a real everyday advantage.

Efficient, well-distributed central air conditioning

In summer, the CANAIR 4CDH 3T Central Heat Pump works as an efficient central air conditioning system, able to meet the needs of the increasingly hot, humid summers we see in Quebec.

Key features include:

• Cooling capacity: 36,000 BTU

• SEER2 15.8 and EER2 10.7

• Distribution through the existing ductwork, with airflow set on the furnace blower

• Dehumidification, much appreciated during periods of high humidity

Properly sized and balanced, the system helps correct hot spots on upper floors, which are often harder to cool.

R-454B refrigerant: compliance, safety and a long-term view

The CANAIR 4CDH uses R-454B refrigerant, a new-generation A2L fluid with a global warming potential of 466, compared with 2,088 for R-410A.

This technical choice has several concrete advantages:

• A smaller environmental footprint for the system

• Compliance with current requirements

• Refrigerant leak detection, required for A2L refrigerants

• A lasting solution, designed to stand the test of time

ADD-ON design: a pragmatic, economical approach

Ideal integration with existing systems

The ADD-ON concept means the heat pump is added to an existing installation, usually an electric furnace already in place: a 4CDH2036C21 outdoor unit and a CEB-36MX1721 cased coil set on the furnace. This approach lets you:

• Keep the existing ductwork

• Avoid heavy, costly work

• Combine the heat pump and the furnace's backup heat efficiently

• Improve overall efficiency without a major overhaul

Side-discharge format: an often underestimated advantage

The side-discharge design of the outdoor unit offers valuable flexibility:

• Installation possible in tight spaces

• Better visual integration in backyards and urban areas

• Easier access for maintenance

• Controlled sound level

In some densely built neighbourhoods, this format makes installations easier that would be difficult with bulkier units.

A cased coil designed for installation and maintenance

The indoor coil paired with the CANAIR 4CDH 3T is installed on the existing furnace:

• CEB-36MX1721 cased coil (17.5 × 21 × 23.5 in.), installed vertically or horizontally

• Blower: the existing furnace's, with airflow and static pressure checked and adjusted by AirGreen

• Refrigerant line connections of 3/8 in. and 3/4 in.

• Easy access to the coil, for simpler maintenance

For owners of multi-unit buildings and property managers, this ease of maintenance is a significant long-term gain.

Useful everyday features

• Automatic defrost of the outdoor unit in winter conditions

• Inverter compressor, which modulates its output instead of constantly starting and stopping

• A2L refrigerant leak detection, connected and checked during installation

These features contribute directly to the system's reliability and the occupants' peace of mind.

Professional installation: a deciding factor

Why capacity choice and settings matter

At AirGreen, we regularly see that a well-installed system can perform much better than a poorly sized one, even when it is the same model.

On every project, our teams pay particular attention to:

• An on-site assessment of the building's heating needs

• Choosing a suitable capacity (here, 3 tons)

• Balancing the ductwork

• Setting airflow and static pressure

• Integration with the furnace's backup heat

These steps are essential for stable, lasting performance.

Electrical data and compliance

For the 3-ton version:

• Voltage: 220 V

• Minimum circuit ampacity (MCA): 29 A

• Maximum overcurrent protection (MOP): 30 A

• Outdoor sound level: about 62.5 dB(A)

Every installation follows the electrical and mechanical standards in force in Quebec, under AirGreen's RBQ licence 5645-9605-01.

Hydro-Québec LogisVert aid

This combination (AHRI 216621492) is on Hydro-Québec's LogisVert list of October 27, 2026, with an indicative amount of $3,504. Only Hydro-Québec confirms the aid granted. This aid lowers the project's net cost.

At AirGreen, we support our clients at every step: checking the model's eligibility, technical documents and advice on the aid available.

Warranty and long-term peace of mind

This system comes with:

• A 10-year base warranty on the compressor and parts

• 6 years on labour, directly from the distributor, with an extended warranty option

This coverage is especially valued in residential and multi-unit projects, where long-term reliability is a central criterion.

Why trust AirGreen with your project?

• Expertise in HVAC installation in Montreal, Laval, Longueuil, the North Shore and the South Shore

• A rigorous, personalized technical approach

• Clear, transparent pricing

• Experienced refrigeration technicians

• $5,000,000 civil liability insurance

• Full support before, during and after the installation

We never propose a central heat pump without making sure it truly matches the building's needs and the client's expectations. To see installations completed by our teams, visit our Our projects page.

Conclusion: a coherent, durable central solution

The CANAIR 4CDH R-454B "ADD-ON" Central Heat Pump | 3T is a complete, realistic solution for the Quebec market: heating down to -30°C, efficient cooling, ADD-ON integration, a modern refrigerant and a place on Hydro-Québec's LogisVert list.

For a personalized assessment, a detailed quote or to discuss the best configuration for your building, contact AirGreen Climatisation & Chauffage directly at 514-316-2973 or sales@airgreen.ca. Our specialists will take the time to look at your situation and offer a suitable solution.

Warranty: 10 years on the compressor, 10 years on parts and 6 years on labour, directly from the distributor.