CANAIR 4CDH R-454B "ADD-ON" Central Heat Pump | 2T - Cased Coil
SEER2 (Seasonal Energy Efficiency Ratio)
HSPF2 (Heating Seasonal Performance Factor)
EER2 (Instant Cooling Efficiency)
COP at -8 °C (Heating energy efficiency)
COP at -15 °C (Heating energy efficiency)
Operating temperature down to -30 °C (MAX)
CFM (Airflow)
A thoughtful central approach, suited to Quebec's real buildings
At AirGreen, we have been installing central HVAC systems for over 15 years in real-world situations that are sometimes complex and rarely ideal on paper. From Montreal single-family homes with aging ductwork, to Laval bungalows heated with electricity, to multi-unit buildings in Longueuil or newer homes on the North and South Shores: every project has its own technical constraints.
The CANAIR 4CDH R-454B | 2-ton “ADD-ON” central heat pump is one of the solutions we favour when a complete system replacement is neither necessary nor logical. It is designed to integrate with an existing furnace, while bringing real gains in comfort, thermal stability and energy efficiency.
This is not a temporary compromise, but a structured choice, often wiser than a full replacement, when the air distribution works and is properly sized.
The typical context of an ADD-ON installation
In many ADD-ON projects, the same scenario comes up:
A furnace that is still reliable, sometimes recent.
Air conditioning that is missing, undersized or inefficient.
High heating costs during long cold spells.
A clear wish to rely less on more expensive energy, without transforming the existing infrastructure.
The ADD-ON format answers exactly this reality. It brings in a high-performance central heat pump without demolition, without redoing the whole HVAC network and without multiplying indirect costs.
The ADD-ON format: an often underestimated technical logic
An integration that respects what is already there
A well-designed ADD-ON system, installed with care, makes full use of the existing ductwork. With the CANAIR 4CDH, the outdoor unit and indoor coil connect directly to the existing network, working together with the furnace.
This makes it possible to:
Keep the existing ducts.
Limit structural work.
Make a gradual, controlled energy transition.
A more targeted, but lasting investment
Rather than replacing components that still work, the ADD-ON choice puts the investment where it has the most impact: energy efficiency and seasonal comfort. This logic particularly suits homeowners who plan their upgrades over several years, without giving up current performance.
Measurable performance in heating and cooling
Central heating down to -30°C
The CANAIR 4CDH R-454B 2T central heat pump is ENERGY STAR® cold climate certified. Its operation down to -30°C means a system that keeps contributing to heating, even during the long cold spells we regularly see in Montreal and on the North Shore.
According to the NEEP data for this system (AHRI 216621488):
At -8°C: 19,700 BTU/h (COP 2.66).
At -15°C: 21,000 BTU/h (COP 1.8).
At -30°C: up to 12,100 BTU/h (COP 1.31).
In deep cold, the furnace's electric element covers the share of heat that is missing.
A direct impact on the energy bill
In practice, the heat pump handles a large share of the heating for most of the season, leaving the furnace to step in mainly during extreme cold or as occasional support.
Stable, well-distributed central cooling
With a capacity of 24,000 BTU (SEER2 16.0, EER2 10.0), this model provides even cooling, without overcooled areas or sudden swings. In multi-storey homes, heat often builds up on the upper floor; the CANAIR 4CDH, combined with proper air balancing, helps correct this.
Airflow plays a key role here. With an ADD-ON system, the existing furnace blower moves the air: AirGreen checks and adjusts this airflow based on the network's resistance (filters, elbows, duct lengths), which improves:
Thermal comfort.
Humidity control.
Component life.
A design built for maintenance and longevity
A practical, accessible indoor coil
The CEB-24MX1721 cased indoor coil (17.5 × 21 × 18 in.) paired with the CANAIR 4CDH installs on the existing furnace. It offers:
A multi-position configuration (vertical upflow, downflow or horizontal).
Easy access to the coil for inspection and cleaning, while the filter remains the furnace's.
Quiet operation, indoors and outdoors
With an outdoor sound level of about 60 dB(A), the heat pump stays discreet, a key factor in dense residential areas. The inverter compressor ramps its output up and down gradually, avoiding the abrupt starts occupants often find uncomfortable.
R-454B refrigerant: environmental consistency
R-454B, classified A2L, is an important step forward from older refrigerants. Its global warming potential of 466, compared with 2,088 for R-410A, fits an environmental approach in line with current trends in the Quebec market. Like every A2L system, this heat pump includes refrigerant leak detection, connected and checked during installation.
LogisVert support and AirGreen guidance
This combination (AHRI 216621488) is on Hydro-Québec's LogisVert list of October 27, 2026, with an indicative amount of $2,364, depending on project eligibility. Only Hydro-Québec confirms the aid granted. At AirGreen, we check:
AHRI number compliance.
The exact system configuration.
Compliance with the required technical criteria.
Common mistakes we systematically avoid
With ADD-ON systems, some errors can seriously hurt overall performance if they are not anticipated:
Poor assessment of the existing static pressure.
Unbalanced airflow after installation.
Installation on a poorly maintained or unsuitable furnace.
At AirGreen, every installation includes a complete analysis of the ductwork, precise adjustments and testing at start-up.
Why entrust your project to AirGreen
Choosing the CANAIR 4CDH R-454B | 2T central heat pump is a technical decision. Entrusting it to AirGreen makes sure that decision is carried out correctly.
Our approach is based on:
Clear prices confirmed before work begins.
Experienced refrigeration technicians, under AirGreen's RBQ licence 5645-9605-01.
$5 million in liability insurance.
Field knowledge of HVAC conditions in Montreal, Laval, Longueuil, the North Shore and the South Shore.
We never recommend this model by default. It is offered only when it precisely meets the building's needs and the client's expectations. To see installations completed by our teams, visit our Our projects page.
A consistent, durable central heat pump
The CANAIR 4CDH R-454B 2-ton is for homeowners looking for a well-thought-out central solution that integrates with an existing installation while offering:
Heating down to -30°C.
Stable, well-distributed central cooling.
Tangible energy efficiency, with Hydro-Québec's LogisVert aid.
It is a pragmatic solution that fits a long-term vision of home comfort in Quebec.
Talk to an AirGreen expert now
Considering a central HVAC installation or wondering whether an ADD-ON setup suits your property? Contact AirGreen for a detailed assessment, a clear estimate and complete support, whether you are in Montreal, Laval, Longueuil, the North Shore or the South Shore.
Phone: 514-316-2973
Email: sales@airgreen.ca
Warranty: 10 years on the compressor, 10 years on parts and 6 years on labour, directly from the distributor.