LG Multi F MAX LGRED R32 Heat Pump | 7 Heads at 48,000 BTU | Montérégie
The LG Multi F Max LGRED R32 48 000 multi-zone heat pump heats and cools 7 rooms with a single outdoor unit. it delivers 35,000 BTU/h at −8 °C, heats down to −25 °C and qualifies for a $4,200 LogisVert grant. Installed by AirGreen in Montréal, Laval, Longueuil, the North Shore and the South Shore.
7 rooms, one outdoor unit.
Compared with the 82 multi-zone systems of 48,000 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 56,500 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 100 % 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. $120 per 1,000 BTU/h is the rate for ENERGY STAR cold-climate heat pumps (guide v1.10).
Where it ranks among same-size multi-zone systems.
Compared with the 82 multi-zone systems of 48,000 BTU we sell, using the LogisVert list figures. Weaknesses too, said plainly.
Against three other brands in its class.
Same rated size, other manufacturers. Pick the opponent.
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 multi-zone solution designed for complex buildings in Quebec
At AirGreen, we install HVAC systems in situations where a standard wall-mounted heat pump quickly reaches its limits: large residences, multi-unit buildings, commercial spaces with several distinct thermal zones, or buildings undergoing phased renovations. The LG Multi F MAX LGRED R32 heat pump with 7 heads and a capacity of 48,000 BTU is perfectly suited to this reality.
This multi-zone system allows up to seven independent indoor units to be powered by a single outdoor unit, while maintaining precise temperature control, excellent winter heating stability, and unparalleled installation flexibility. In the Montérégie region , as well as in Montreal , Laval , Longueuil , and on the North and South Shores , we deploy this type of solution when technical requirements and the desired comfort level justify a lightweight, commercial-grade system.
Why a Multi F MAX system rather than several individual heat pumps?
In many projects, the initial reaction is to multiply the number of external units. However, this approach often leads to:
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a visual saturation of the facades or rear courtyards
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heavier electrical constraints
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a more complex acoustic management
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more dispersed maintenance
The LG Multi F MAX LGRED R32 heat pump addresses these challenges by centralizing heat production while maintaining complete independence for each indoor zone . Each wall-mounted unit, console, or ducted unit operates according to the actual needs of its space, without impacting other zones.
At AirGreen, we have installed this type of configuration in triplexes in Longueuil , intergenerational homes in Montérégie , as well as in light commercial buildings in Montreal East , where limiting the number of outdoor units was a key criterion.
Technical architecture and installation flexibility
An outdoor unit designed for the Quebec climate
The KUMXA481A outdoor unit is designed to operate efficiently in heating mode down to -25°C , a critical threshold for Quebec winters. Unlike many older multi-zone systems, this generation maintains usable capacity even during prolonged periods of cold, thus reducing the need for backup systems.
In practice, this means:
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improved thermal stability in areas far from the building
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fewer aggressive defrost cycles
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more gradual mechanical wear
R-32 refrigerant: a technical and regulatory choice
The choice of R-32 is not insignificant. This refrigerant allows for:
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a reduced total charge compared to R-410A
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better heat transfer
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a lower global warming potential
For building owners in Montérégie and on the South Shore , this represents an investment more aligned with current environmental guidelines, without compromising on actual heating, HVAC and air conditioning performance.
Advanced pipe length management
A major advantage of the Multi F MAX system lies in its high tolerance for refrigerant line lengths and elevation changes. This characteristic is crucial in:
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multi-story buildings
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renovations where the outdoor unit needs to be located far away
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buildings with centralized technical facilities
At AirGreen, we systematically integrate this data from the design phase in order to avoid common mistakes: yield losses, imbalances between zones or long-term maintenance constraints.
Indoor units: adapt each zone to its actual use
The LG Multi F MAX LGRED R32 heat pump is compatible with several LG indoor unit models, ranging from 9,000 to 18,000 BTU . This modularity allows for precise adjustment of each zone according to:
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the actual volume of the room
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his exhibition
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its use (bedroom, living room, office, shop)
In a recent project in Boucherville , for example, we combined:
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quieter units for bedrooms
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higher airflow units for common areas
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a balanced distribution avoiding any unnecessary over-dimensioning
This approach improves comfort, but also reduces annual electricity consumption.
Acoustic comfort and quality of life
An often underestimated aspect of multi-zone systems is perceived noise , both indoors and outdoors. The LGRED Multi F MAX is designed to maintain low noise levels, even when multiple zones are simultaneously requiring heating or cooling.
At AirGreen, we pay particular attention to:
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the exact location of the outdoor unit
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vibrational transmission to the structure
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the choice of supports and insulation
This rigor is essential, particularly in the dense neighborhoods of Montreal and Laval , where acoustic constraints are an integral part of the project.
LogisVert subsidy and profitability analysis
This system is eligible for the LogisVert provincial grant , with an amount of up to $4,200 , depending on the final configuration and applicable criteria. For many clients in the Montérégie region and on the South Shore , this financial assistance makes a real difference in their decision to opt for a superior multi-zone system.
At AirGreen, we systematically integrate:
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the analysis of eligibility
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Optimizing the configuration to maximize the subsidy
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administrative support
This allows the client to focus on the technical choice, without unnecessary complexity.
Common mistakes we intentionally avoid
Our field experience has taught us that multi-zone systems are particularly susceptible to design flaws. Among the most common are:
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overloading the outdoor unit with improperly sized heads
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neglecting the balancing of pipe lengths
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ignore the actual electrical constraints of the building
At AirGreen, every multi-zone heat pump project begins with a detailed analysis of the building, its uses, and its future constraints. This proactive approach explains why our installations age better and maintain their performance over time.
Why entrust this type of project to AirGreen?
Installing an LG Multi F MAX LGRED R32 heat pump | 7 heads | 48,000 BTU is not a standard installation. It is a structured HVAC project requiring:
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advanced technical expertise
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a mastery of electrical and refrigeration standards
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a long-term vision for the maintenance and evolution of the building
At AirGreen, our refrigeration technicians work daily on this type of system in Montreal , Laval , Longueuil , on the North Shore , the South Shore , and in the Montérégie region . This hands-on experience results in consistent, durable installations adapted to the realities of Quebec.
Conclusion
The LG Multi F MAX LGRED R32 heat pump with 7 heads at 48,000 BTU is an excellent choice for demanding homeowners looking for a high-performance, scalable HVAC system well-suited to Quebec's harsh winters.
For a personalized analysis, a detailed estimate, or to check your eligibility for the LogisVert grant , contact AirGreen directly. Our team will support you every step of the way, from design to installation, with the meticulous attention to detail for which we are known.
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: 35,000 BTU/h at −8 °C, 48,000 at −15 °C.
How many heads can I connect?
Up to 8 on this outdoor unit. This product is configured for 7 heads.
How much is the LogisVert grant?
$4,200 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, cold climate, ID 3621305. It also meets the ENERGY STAR Most Efficient criteria, according to the ENERGY STAR database.
Down to what temperature does it heat?
Down to −25 °C.
Is it noisy?
Indoors, the reference head goes down to 29 dB(A). Outdoors, 56 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.