LG Multi F MAX LGRED R32 Heat Pump | 4 Heads at 48,000 BTU | Montérégie
The LG Multi F Max LGRED R32 48 000 multi-zone heat pump heats and cools 4 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.
4 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 the demanding buildings of the Montérégie region
At AirGreen , we have been installing HVAC systems for many years in a wide variety of settings: single-family homes, semi-detached houses, multi-unit residential buildings, and light commercial buildings. The LG Multi F MAX LGRED R32 heat pump with 4 indoor units and a nominal capacity of 48,000 BTU is perfectly suited to this regional reality: compartmentalized buildings, varying comfort needs in different areas, outdoor space constraints, and high energy requirements.
In the Montérégie region , we often encounter projects where a single outdoor unit needs to supply multiple spaces: ground floor and upper floor, enclosed offices, commercial spaces with technical areas, or even apartments where each occupant wants independent control. This is precisely the area where this advanced multi-zone system is ideally suited.
Multi F MAX LGRED Architecture: what truly distinguishes this system
An outdoor unit designed for intensive multi-zone use
The heart of the system is the LG Multi F MAX LGRED R32 outdoor unit – model KUMXA481A – capable of powering up to 8 indoor units , including 4 simultaneously in the configuration shown here. Unlike traditional residential multi-split systems, this platform originates from the light commercial sector, with:
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a variable-speed scroll compressor designed to operate over wide load ranges
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a much more precise electronic refrigerant management (EEV) system
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a high tolerance for pipe lengths and level differences between units
These features are essential in South Shore buildings, where pipe runs are rarely simple and the outdoor unit is not always installed directly behind each indoor head.
R-32 refrigerant: technical and regulatory choice
R-32 is not a marketing ploy for AirGreen; it's a logical technical choice. This refrigerant offers:
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improved thermodynamic efficiency compared to R-410A
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a lower total load for the same capacity
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a reduced global warming potential (GWP) , in line with regulatory guidelines in Quebec
In our facilities in Montérégie , this point is particularly relevant for new or renovated buildings aiming for better overall energy performance.
Indoor units: adapt each zone to its actual use
A full range of power outputs
One of the major advantages of the LG Multi F MAX is the flexibility in choosing indoor units. Depending on the configuration selected, we can install wall-mounted units of:
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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 allows for precise adjustment of capacity for each room: bedroom, office, open-plan area, retail space, or meeting room. In practice, this approach avoids two common errors that we often correct in existing systems:
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Oversizing , a source of discomfort and short cycles
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Undersizing , which forces the device to operate continuously
Acoustic comfort and air diffusion
The wall units compatible with this system are designed to operate quietly , even under partial load. In residential projects in the Montérégie region , this is a key criterion, particularly for:
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bedrooms
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home offices
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care or consultation areas
Automatic control of the shutters (horizontal and vertical) allows for homogeneous air distribution, limiting localized cold or hot zones.
Heating performance: a crucial point for Quebec's climate
Reliable heating in cold weather
The LG Multi F MAX LGRED is designed to maintain stable heating capacity down to -25°C , which corresponds to the climatic realities of the Montérégie region . In our projects, this translates to:
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a primary heating system for many buildings
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a marked reduction in the use of backup systems
It is important to point out that, on this type of advanced multi-zone system, seasonal performance indicators must be interpreted correctly: the priority is capacity stability and intelligent load management , rather than isolated theoretical figures.
Real example in Montérégie
During a recent installation in a multi-unit residential building in Saint-Jean-sur-Richelieu , we replaced several independent systems with an LG Multi F MAX 48,000 BTU unit with four separate zones. Results observed after a full season:
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stable temperature in each dwelling
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Significant reduction in service calls
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better control of energy costs for the owner
HVAC Installation: Why Expertise Makes All the Difference
Piping and bypass unit management
This type of system requires advanced expertise in HVAC installation :
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compliance with maximum pipe lengths
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managing height differences between units
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correct installation of distribution units (BDUs) when required
At AirGreen, our refrigeration technicians plan each piping network before even arriving on site. This preparation significantly reduces the risk of imbalances between zones and guarantees long-lasting performance.
Common mistakes to avoid
We regularly work on poorly installed multi-zone systems. The most common problems are:
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Inadequate choice of power levels per zone
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non-optimized pipe lengths
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lack of reflection on the future evolution of the building
An improperly sized LG Multi F MAX loses many of its advantages. That's why we always insist on a complete analysis before any installation in Montérégie , the South Shore , or the North Shore .
LogisVert subsidy: an important financial lever
At the time of writing, this system is eligible for a provincial LogisVert grant of up to $4,200 , depending on the final configuration and building type. For many projects in the Montérégie region , this financial assistance makes a real difference in the decision to invest in a high-quality, multi-zone system.
We systematically support our clients in:
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eligibility verification
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the preparation of the required documents
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the technical conformity of the installation
Why choose AirGreen for this LG system?
Choosing an LG Multi F MAX LGRED R32 is an important technical decision. Choosing AirGreen to install it is just as important. Our customers trust us for:
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our field experience in multi-zone HVAC
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our ability to operate in Montérégie , Montreal , Laval , Longueuil , South Shore and North Shore
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the transparency of our recommendations and our offers
Each project is treated as a bespoke system, never as a simple standard installation.
A solution truly suited to today's buildings
The LG Multi F MAX LGRED R32 heat pump – 4 heads, 48,000 BTU – is designed for homeowners and managers looking for:
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maximum flexibility per zone
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proven reliability in cold climates
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a scalable HVAC solution, capable of adapting to future changes
In Montérégie , it is one of the most coherent systems for combining comfort, performance and control.
Contact AirGreen
For a complete analysis , a detailed quote , or a technical visit , contact AirGreen Heat Pumps, Air Conditioning & Heating . We will guide you toward the configuration best suited to your building and your energy 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 4 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.