LG Multi F MAX LGRED R32 Heat Pump | 6 Heads at 48,000 BTU | Montérégie
The LG Multi F Max LGRED R32 48 000 multi-zone heat pump heats and cools 6 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.
6 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 high-end, multi-zone solution designed for complex buildings in Quebec
In many high-end residential , multi-unit or light commercial projects in Montérégie , Montreal , Laval , on the South Shore or the North Shore , one challenge constantly recurs: how to ensure precise, stable and independent thermal comfort in several zones, while limiting the exterior footprint and energy consumption?
The LG Multi F MAX LGRED R32 heat pump – 6 heads at 48,000 BTU – was designed precisely for this type of real-world situation. At AirGreen , we install this system when the needs far exceed those of a standard wall-mounted heat pump and require a smart, scalable, and sustainable HVAC architecture .
Why the Multi F MAX LGRED is a real game changer
Unlike simplified multi-zone systems, the LG Multi F MAX LGRED relies on a dynamic power distribution logic: the outdoor unit continuously adjusts its output according to the actual demand of each indoor unit. The result:
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Stable temperature per zone , without overheating or underpowering.
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Reduced on/off cycles , therefore less mechanical wear.
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Real energy optimization , especially in buildings where areas are never used simultaneously.
In a recent AirGreen project on the South Shore , a renovated triplex with six wall units of varying capacities (9,000 to 18,000 BTU) previously benefited from independent, inconsistent systems. Switching to the LGRED Multi F MAX reduced the overall electrical load , improved perceived comfort, and dramatically simplified annual HVAC maintenance.
Technical architecture and actual system capabilities
The heart of the system is the KUMXA481A outdoor unit, capable of supplying up to 8 zones (6 in the configuration shown here) for a nominal capacity of 48,000 BTU in air conditioning .
This type of configuration is particularly suitable for:
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Intergenerational housing
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Multi-unit residential buildings
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Professional offices
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Commercial spaces with enclosed offices
Advanced refrigeration network management
The Multi F MAX system uses Building Distribution Units (BDUs) to precisely distribute R-32 refrigerant to each indoor unit. This design allows for:
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Long pipe runs , ideal for multi-story buildings
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A level of installation flexibility rarely achieved with standard wall systems
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Pressure stability that protects the compressor in the long term
These technical parameters are essential in complex projects and are systematically validated by our teams during the HVAC design phase.
Choosing R-32 refrigerant: a concrete advantage in Quebec
R-32 is not just a marketing ploy. In the Quebec and Canadian regulatory context, it represents a strategic choice :
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Reduced global warming potential compared to older refrigerants
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Improved thermal efficiency , therefore less energy consumed for the same level of comfort.
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Long-term compatibility with evolving environmental standards
For homeowners in Montreal , Laval or the Montérégie region , this means a more sustainable investment, less exposed to future restrictions.
Truly controlled acoustic comfort
In multi-zone projects, noise is often a sensitive issue. The LG Multi F MAX LGRED stands out because of:
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A controlled external noise level , despite the overall power
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Discreet indoor units , suitable for bedrooms, offices and meeting rooms
During an AirGreen installation in an office building in Longueuil , the occupants immediately noticed the difference: the system replaced several noisy independent units with a single centralized outdoor unit, with a noticeable reduction in perceived noise.
Extended compatibility of indoor units
One of the major advantages of the Multi F MAX is its compatibility with several indoor unit formats :
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High-efficiency wall-mounted units (9,000 to 18,000 BTU)
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Mixed configurations depending on the needs of the rooms
This flexibility allows AirGreen to adapt each zone according to:
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The building's orientation
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The actual occupation of spaces
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Specific thermal loads (windows, equipment, usage)
Subsidies and medium-term profitability
In several eligible projects, this type of system can open the door to provincial grant programs , such as LogisVert , depending on the configuration and the building.
Beyond financial assistance, profitability is primarily demonstrated by:
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A measurable reduction in electricity consumption
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Extended lifespan thanks to intelligent modulation
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Centralized HVAC maintenance , easier to schedule
AirGreen's expertise: much more than just an installation
Installing an LG Multi F MAX LGRED is not something to be done haphazardly. At AirGreen , each project follows a rigorous methodology:
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Complete analysis of thermal loads
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Validation of pipe lengths and elevations
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Precise selection of indoor units
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Documented and tested commissioning
This approach explains why many clients in Montreal , Laval , North Shore and South Shore entrust us with projects that other entrepreneurs prefer to refuse.
Common mistakes to avoid with multi-zone systems
Based on experience with hundreds of HVAC installations, certain errors frequently recur:
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Unnecessarily oversizing the outdoor unit
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Mixing incompatible indoor units
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Neglecting zone balancing
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Underestimating the importance of refrigeration system design
The Multi F MAX LGRED is unforgiving of such inaccuracies. It is precisely for this reason that it must be entrusted to an experienced team.
A solution truly adapted to the realities of Quebec
Between harsh winters, increasingly hot summers and growing energy demands, the LG Multi F MAX LGRED R32 Heat Pump – 6 heads on 48,000 BTU stands out as a coherent, sustainable and efficient solution for demanding projects in Montérégie , Montreal , Laval , on the South Shore and the North Shore .
Need a quote or a personalized analysis?
At AirGreen , we support each client from the initial assessment to long-term HVAC maintenance. For a detailed estimate, grant approval, or a custom design, contact our team directly . We will offer you a solution truly tailored to your building and your objectives.
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 6 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.