LG Multi F MAX LGRED R32 Heat Pump | 8 Heads at 48,000 BTU | Montérégie
The LG Multi F Max LGRED R32 48 000 multi-zone heat pump heats and cools 8 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.
8 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 HVAC solution designed for complex buildings in the Montérégie region
In the residential, light commercial, and multi-unit residential sectors of Montérégie , Montreal , Laval , Longueuil , the North Shore , and the South Shore , heating and cooling needs are evolving rapidly. Buildings are more compartmentalized, uses are more varied, and expectations for comfort, control, and energy efficiency are high.
The LG Multi F MAX LGRED R32 heat pump with 8 indoor heads and a nominal capacity of 48,000 BTU precisely meets this type of reality.
At AirGreen , we install this type of system when simpler solutions reach their limits: large cottages, multi-unit residential buildings, offices spread across several zones, and commercial spaces with varying heating and cooling loads. This multi-zone system allows for room-by-room comfort adjustments while maintaining a single, high-performance outdoor unit.
Technical architecture of the LG Multi F MAX LGRED R32 system
A robust outdoor unit designed for the Quebec climate
The core of the system is the KUMXA481A outdoor unit, designed to operate efficiently across a wide temperature range, with a heating capacity down to -25°C . This makes it a viable solution for year-round use in the Montérégie region and throughout Greater Montreal.
From a technical standpoint, this unit incorporates:
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A variable speed scroll compressor ensuring precise power modulation.
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Stable heating operation even during prolonged cold spells.
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Intelligent defrost management is essential to maintain performance in winter.
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A design compatible with long pipe runs, which facilitates integration into complex existing buildings.
8 independent zones, one central system
The Multi F MAX allows you to connect up to 8 indoor units of various sizes and capacities:
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9,000 BTU
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12,000 BTU
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14,300 BTU
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18,000 BTU
This flexibility is crucial. In the same building, a living room with windows, a north-facing bedroom, and a computer room never have the same heating and cooling requirements. Thanks to this architecture, each area receives precisely the necessary capacity, without unnecessary oversizing.
Why R-32 refrigerant is a game changer
The choice of R-32 is not insignificant. This new generation refrigerant offers several concrete advantages:
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Reduced environmental impact compared to older gases.
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Better thermodynamic efficiency, therefore less energy consumed at equivalent load.
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Lower quantity of refrigerant required for the same capacity.
In our projects on the South Shore and in Montérégie , we find that R-32 systems offer increased stability and a faster response to load variations, particularly in mid-season.
Air management, acoustics and real comfort
Controlled noise levels
The outdoor unit has a noise level of approximately 56 dB(A) , which is compatible with the majority of residential and commercial environments when the installation is properly planned.
The indoor units, meanwhile, operate at very discreet levels depending on the model chosen, which is particularly appreciated in bedrooms and offices.
Precise and even air distribution
LG wall-mounted heads compatible with the Multi F MAX offer:
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An automatic vertical and horizontal scan .
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Uniform air distribution, limiting cold or overheated areas.
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Independent control by zone is essential to avoid comfort conflicts between occupants.
Multi-zone installation: what the AirGreen experience really changes
Installing an LG Multi F MAX system is not something to be done on a whim. The complexity lies not only in the equipment, but also in the design of the refrigeration network :
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Management of equivalent pipe lengths .
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Strict adherence to maximum height differences between units.
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Correct integration of the distribution boxes , which are mandatory for the system to function.
At AirGreen , every project begins with a detailed analysis:
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Accurate survey of the building.
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Calculation of charges per zone.
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Validation of piping routes and technical access points.
This approach helps to avoid common problems observed in poorly planned installations: capacity losses, short cycles, imbalances between zones or excessive noise.
Concrete examples of installations in Montérégie and the South Shore
In a multi-unit residential building in Boucherville , we installed a Multi F MAX 48,000 BTU to serve 7 residential units. Each unit had different needs depending on its orientation and occupancy.
The result:
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Significant reduction in complaints related to comfort.
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More stable energy consumption over the year.
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Simplified maintenance thanks to a single outdoor unit.
In a commercial building in Longueuil , the system made it possible to separate customer areas, offices and technical rooms, each with its own temperature guidelines.
LogisVert subsidy and energy compliance
This system is eligible for the provincial LogisVert grant , with an amount of up to $4,200 , depending on the configuration and the project.
AirGreen systematically supports its clients in:
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Validation of eligibility.
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The preparation of the required technical documents.
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Compliance with the required performance criteria.
Maintenance, durability and guarantees
The LG Multi F MAX LGRED R32 is designed to last, but like any advanced HVAC system, it requires structured maintenance :
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Annual check of compressor pressures and operation.
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Cleaning of heat exchangers and filters.
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Electrical and communication connection control.
The standard warranty covers 10 years on the compressor and parts and 6 years on labor, straight from the distributor, with the possibility of extensions depending on the project and the agreement chosen.
Why choose AirGreen for this type of system?
This type of multi-zone heat pump does not tolerate approximation or improvisation.
Choosing AirGreen means benefiting from:
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Extensive expertise in LG multi-zone systems .
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Certified installers experienced in complex configurations.
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With full coverage including $5 million liability insurance .
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With an active presence in Montreal, Laval, Longueuil, North Shore, South Shore and Montérégie .
Conclusion
The LG Multi F MAX LGRED R32 heat pump | 8 heads | 48,000 BTU represents a high-level HVAC solution for demanding buildings, where zoned comfort, winter reliability, and energy efficiency are non-negotiable.
For a personalized analysis , a detailed quote , or a technical validation of your project , contact AirGreen directly. Our team will take the time to assess your building and design an installation perfectly suited to your needs.
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 8 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.