LG MULTI F MAX R32 4-Zone Heat Pump | 54,000 BTU Compressor
The LG Multi F Max R32 54 000 multi-zone heat pump heats and cools 4 rooms with a single outdoor unit. it delivers 37,200 BTU/h at −8 °C, heats down to −16 °C and qualifies for a $1,860 LogisVert grant. Installed by AirGreen in Montréal, Laval, Longueuil, the North Shore and the South Shore.
4 rooms, one outdoor unit, and the most powerful in its class at −8 °C.
Compared with the 7 multi-zone systems of 54,000 BTU we sell. Every number on this page carries its source.
The parts that make a multi-zone system.
Tap a part to learn more.
Outdoor unit
One compressor for the whole house. It supplies up to 8 heads and modulates from 12,420 to 48,000 BTU/h depending on what the rooms call for (NEEP).
Base pan heater
A heater keeps the outdoor unit’s base pan free of ice below 1 °C and during defrost (NEEP).
Refrigerant lines
One pair of lines per head.
Indoor heads
One head per room, each with its own remote and temperature. The combination is chosen in the “Zones” menu.
Control
Each zone is set separately, also from your phone.
Turn rooms on and off. Watch the power being shared.
One outdoor unit supplies every head: when several rooms call at once, they share its capacity. Pick an outdoor temperature.
Tell us your rooms. We tell you if this size is enough.
Pick the number of rooms and their size. The estimate targets a −15 °C day; it is a guide, the real calculation is done room by room at your home.
The whole series at a glance: find the box that fits you.
Each box is a product: the outdoor unit’s size, and the number of heads.
At −15 °C, it still delivers 72 % of its rated capacity.
Tap a temperature: certified capacity, efficiency and the cost of one hour of heating.
It slows down, it speeds up: the certified modulation range
Light bar: from minimum to maximum capacity. Dark mark: the rated value.
At every temperature, cheaper than baseboards.
Cost of one hour at full output, for the same heat delivered. Hydro-Québec Rate D, second tier: 11.142 ¢/kWh.
The official ratings, on the same scales as before.
SEER2, HSPF2 and EER2 come from the AHRI certification. The mark shows the median of the same-size multi-zone systems we sell.
A grant you can calculate, not guess.
The capacity at −8 °C comes from Hydro-Québec’s list of October 1, 2026. $50 per 1,000 BTU/h is the rate for ENERGY STAR heat pumps (guide v1.10).
Where it ranks among same-size multi-zone systems.
Compared with the 7 multi-zone systems of 54,000 BTU we sell, using the LogisVert list figures. Weaknesses too, said plainly.
One multi-zone or several wall units? Both sides, honestly.
We compare both options on your floor plan during the estimate.
What to know before installing a multi-zone system.
Dimensions, wiring and lines, drawn. Then our six steps.
The outdoor unit, dimensioned
One circuit for the whole house
Published sound levels, on one scale.
We use the outdoor figure to choose where the unit goes.
What is particular about this machine.
Only facts published by ENERGY STAR, NEEP or the manufacturer.
Every number, and where it comes from.
Each line carries its source; a line with no published value is not shown.
The manufacturer’s documentation, as PDF.
Everything we have written about this system.
A centralized and precise HVAC solution for complex buildings in Quebec
At AirGreen, we've been installing HVAC systems long enough to know that a multi-zone system is never just a catalog choice. It's a strategic decision that impacts a building's comfort, energy efficiency, and long-term reliability. The LG MULTI F MAX R32 4-Zone Heat Pump with a 54,000 BTU compressor is specifically designed for these demanding projects: large residences, multi-unit residential buildings, commercial spaces, offices, or hybrid buildings.
This LG model stands out for its ability to power up to 8 indoor units , while offering independent zone management, excellent heating stability in cold climates, and unparalleled installation flexibility. In the Montreal, Laval, Longueuil, North Shore, and South Shore areas, we often encounter buildings with complex architectural constraints: low ceilings, multiple partitions, staggered floors, and significant duct lengths. It is precisely in this context that this system proves its worth.
A multi-zone architecture designed for real-world projects
Independent management of zones, without compromise
The LG MULTI F MAX R32 allows you to simultaneously connect several types of indoor units: wall-mounted, ducted, console, or ceiling-mounted, depending on the specific needs of each zone. In a duplex or triplex in Montreal, for example, we can configure:
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one zone for each dwelling,
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an area dedicated to common areas,
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a separate area for an office or shop on the ground floor.
Each zone benefits from its own temperature control, airflow, and scheduling, without negative interaction with other spaces. This approach significantly reduces complaints related to comfort differences between rooms, a common problem with traditional centralized systems.
Up to 8 zones on a single outdoor unit
Although this configuration is often used in a quad-zone setup, the system accommodates up to 8 indoor units , allowing for future building expansion without replacing the outdoor compressor. We recently installed this model on the South Shore , in a residential building where the owner initially wanted to air-condition four apartments and then gradually add more zones during subsequent renovations.
Thermal performance adapted to the Quebec climate
Reliable heating down to -16°C
The 54,000 BTU compressor provides stable heating power down to -16°C , with a capacity maintained at over 39,000 BTU at -15°C . In practice, this means the heat pump continues to provide efficient primary heating for most of the Quebec winter, reducing the need for backup systems.
In several installations in Laval and on the North Shore , we measured a significant reduction in electricity consumption compared to older dual-energy or direct electric systems, while maintaining constant comfort even during cold spells.
High energy efficiency
This system displays remarkable efficiency indicators:
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SEER2 greater than 20 in air conditioning,
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High HSPF2 for seasonal heating,
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High COP at -8°C , a sign of excellent electricity conversion into useful heat.
These features make the LG MULTI F MAX R32 Heat Pump eligible for the LogisVert grant , currently valued at $1,860 , subject to project eligibility and applicable conditions.
R-32 refrigerant: a coherent technical and environmental choice
The choice of R-32 is not insignificant. At AirGreen, we have observed several concrete advantages in the field:
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better heat transfer
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reduced refrigerant charge,
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lower environmental impact compared to older gases.
On urban construction sites in Montreal , where regulatory and environmental constraints are becoming increasingly strict, this type of refrigerant represents a real advantage in the medium and long term.
Installation flexibility is essential in urban environments.
Significant pipe lengths and elevation changes
The LG MULTI F MAX R32 accepts:
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a total length of pipes exceeding 475 feet ,
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height differences of up to nearly 100 feet between units.
In practical terms, this allows us to install the outdoor unit on a roof, in a backyard, or in a remote technical space, while efficiently serving indoor units spread across multiple floors. This flexibility is crucial in Longueuil 's multi-unit residential buildings or the narrow commercial buildings in the city centre.
Acoustic comfort: an often underestimated aspect
The outdoor noise level of approximately 55 dB(A) remains very acceptable for a system of this capacity. Indoors, some compatible units can operate at less than 30 dB(A) depending on the model and configuration chosen.
In several residential projects, particularly condominiums on the South Shore , this aspect has been crucial in obtaining approval from the condominium association and ensuring the peace and quiet of the occupants.
Real-life case: multi-unit apartment building in Montreal
We recently installed an LG MULTI F MAX R32 54,000 BTU in a four-unit apartment building in the Plateau-Mont-Royal neighborhood. There were many constraints:
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Limited outdoor access
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strict acoustic requirements
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long pipe lengths,
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owner's desire to maintain independent control over each unit.
The LG multi-zone solution enabled:
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a single, discreetly positioned outdoor unit,
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four completely independent zones,
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a significant reduction in operating costs,
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eligibility for provincial subsidies.
The owner particularly appreciated the stability of the heating and the ease of management via the integrated WiFi , both for tenants and for maintenance.
Key points to consider before installation
At AirGreen, we always emphasize certain elements before recommending this type of system:
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precise sizing of zones and indoor units,
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strict adherence to pipe lengths and slopes,
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appropriate selection of distribution modules (BD Units) ,
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Electrical installation compliant with MCA of 34 A and MOP of 40 A.
A poorly planned installation can negatively impact overall efficiency, even with excellent equipment. That's why we always conduct a comprehensive building analysis before any multi-zone HVAC installation.
Why entrust this project to AirGreen?
Choosing AirGreen means benefiting from:
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certified refrigeration technicians specializing in multi-zone systems,
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from concrete experience on complex residential and commercial projects,
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$5 million in liability insurance ,
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clear, unsurprising support from the quote to commissioning.
We operate daily in Montreal, Laval, Longueuil, on the North Shore and the South Shore , with in-depth knowledge of local realities, subsidies and regulatory requirements.
A sustainable and scalable HVAC solution
The LG MULTI F MAX R32 4-Zone Heat Pump | 54,000 BTU represents a wise investment for homeowners seeking a scalable, high-performance, and reliable solution. Properly designed and installed, it meets current needs while allowing for future expansion.
Take action
For a complete assessment , a detailed quote , or to verify your project's eligibility for available subsidies, contact AirGreen directly. Our team will support you every step of the way, from technical analysis to final installation.
Warranty: 10 years on the compressor, 10 years on parts and 6 years on labor, straight from the distributor.
What people ask us about multi-zone systems.
Can I heat one room and cool another at the same time?
No. On a multi-zone system like this one, every head works in the same mode, heating or cooling. Each room still keeps its own set temperature.
What happens when every room calls for heat?
They share the outdoor unit’s capacity: 37,200 BTU/h at −8 °C, 39,000 at −15 °C.
How many heads can I connect?
Up to 8 on this outdoor unit. This product is configured for 4 heads.
How much is the LogisVert grant?
$1,860 according to Hydro-Québec’s list of October 1, 2026. The grant never exceeds 100 % of the cost before taxes; apply within 9 months of installation.
Is it ENERGY STAR certified?
Yes, ID 3621275. It also meets the ENERGY STAR Most Efficient criteria, according to the ENERGY STAR database.
Down to what temperature does it heat?
Down to −16 °C.
Is it noisy?
Indoors, the reference head goes down to 29 dB(A). Outdoors, 55 dB(A): we place the unit away from bedroom windows.
Why a multi-zone instead of several wall units?
One outdoor unit on the wall and one circuit. In return, the rooms share the capacity, and if the outdoor unit stops, every zone stops.
What does the warranty cover?
Our sheet lists 10 years on the compressor and 10 years on parts. AirGreen extended warranty: possible.
A multi-zone system is planned room by room. At your home.
We measure every room, draw the line route and choose the right head for each zone. The on-site estimate is free and the quote arrives within 24 h.