LG Multi F MAX LGRED R32 Heat Pump | 6 Zones + 42000 BTU | Montérégie
The LG Multi F Max LGRED R32 42 000 multi-zone heat pump heats and cools 6 rooms with a single outdoor unit. it delivers 31,600 BTU/h at −8 °C, heats down to −25 °C and qualifies for a $3,792 LogisVert grant. Installed by AirGreen in Montréal, Laval, Longueuil, the North Shore and the South Shore.
6 rooms, one outdoor unit.
Compared with the 86 multi-zone systems of 42,000 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 6 heads and modulates from 12,420 to 53,200 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 104 % 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 86 multi-zone systems of 42,000 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 install HVAC systems in contexts where the needs far exceed those of a standard single-family home. The LG Multi F MAX LGRED R32 | 6 Zones + 42000 BTU Heat Pump is specifically designed for this type of project: large residences, multi-unit buildings, commercial spaces, offices, or mixed-use buildings located in the Montérégie region , Montreal , Laval , Longueuil , on the South Shore and the North Shore .
This outdoor system, model KUMXA421A , allows you to power up to six independent indoor units from a single outdoor unit, while maintaining precise, stable and reliable temperature control, even during periods of intense cold typical of the Quebec climate.
Understanding the Multi F MAX LGRED R32 architecture
One single outdoor unit, six completely independent zones
The principle of the Multi F MAX is based on a simple but technically advanced logic: a centralized outdoor unit that distributes heating or air conditioning to several indoor units, each of which can operate at its own setpoint.
In practical terms, this means:
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One room can be heated while another is in air conditioning mode.
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Each occupant benefits from personalized comfort.
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Energy management is optimized according to actual needs, zone by zone.
This flexibility is particularly appreciated in plexes , multi-unit residential buildings, clinics, professional offices or shops spread over several separate spaces.
LGRED technology and R-32 refrigerant
LGRED technology combined with R-32 refrigerant is a central element of this system. R-32 offers:
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Improved thermodynamic efficiency.
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A reduced refrigerant charge compared to previous generations.
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A lower global warming potential.
In an increasingly strict regulatory and environmental context, this technological choice fits perfectly with the current requirements of the HVAC market in Quebec.
The KUMXA421A system is designed to maintain stable performance over a wide temperature range, including severe winter conditions, which is essential for installations in Montérégie and on the South Shore .
Real-world performance and reliability in Quebec conditions
Heating and cooling capacity adapted to the local climate
With a nominal capacity of 42,000 BTU , the LG Multi F MAX LGRED R32 heat pump meets the needs of large buildings without requiring multiple outdoor units. This centralized system simplifies installation, reduces the outdoor footprint, and facilitates long-term maintenance.
During our installations in Longueuil and Boucherville , this type of configuration proved particularly effective for:
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Maintaining consistent comfort despite significant variations in outside temperature.
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Reducing excessive start-up cycles extends the lifespan of components.
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To provide a homogeneous distribution of air throughout the building.
Electrical stability and component protection
The KUMXA421A model operates on a 220V power supply, with clearly defined electrical parameters to ensure adequate system protection:
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MCA (minimum circuit ampacity) of 33 A.
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MOP (maximum overcurrent protection) of 40 A.
At AirGreen , we always insist on strict compliance with local electrical standards, whether in Montreal , Laval or Montérégie , in order to avoid long-term reliability problems.
Flexibility of interior units and architectural integration
Wide compatibility of interior models
One of the great advantages of the Multi F MAX is its compatibility with several types of LG indoor units: wall-mounted, console, ducted or ceiling-mounted, depending on the building configuration.
This flexibility allows us, for example:
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To install discreet wall-mounted units in residential dwellings.
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To integrate ducted units into offices for a clean visual result.
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To optimize air distribution in open commercial spaces.
Each project is custom-designed, taking into account the building structure, architectural constraints and the usage habits of the occupants.
Noise management and acoustic comfort
With an outdoor noise level of approximately 56 dB(A) and indoor units capable of operating at very low levels depending on the model chosen, this system integrates well into dense residential environments, particularly on the South Shore and in Montreal , where regulations and the comfort of neighbors are real issues.
For certain wall installations, particularly with high-capacity indoor units, we always inform our customers that the perception of vibrations may vary depending on the wall structure. This transparency is part of our professional approach at AirGreen .
Multi-zone installation: what you absolutely need to master
Managing pipe lengths and elevation changes
A Multi F MAX system requires rigorous planning of the refrigeration piping. Total length, branch, and elevation limits must be respected to ensure system performance and reliability.
In our projects in Laval and on the North Shore , we systematically:
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A detailed analysis of the piping routes.
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A validation of the heights between the outdoor unit and the indoor units.
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Precise load balancing by zone.
This rigor prevents performance losses and unnecessary service calls.
Commissioning and fine-tuning
Once the installation is complete, commissioning is a crucial step. At AirGreen , it includes:
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A complete check of the compressor pressures and operation.
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The electronic controls and Wi-Fi setup are included .
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Functional tests in heating and air conditioning.
This step is often overlooked by less experienced installers, even though it directly affects customer satisfaction.
LogisVert subsidy and long-term value
The LG Multi F MAX LGRED R32 | 6 Zones + 42000 BTU Heat Pump is eligible for the LogisVert provincial subsidy , with an amount of up to $3,792 , depending on the conditions in effect.
In our recent projects in the Montérégie region , this subsidy has enabled several property owners to:
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Significantly reduce the initial cost of the project.
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Accelerate the transition to a fully electric solution.
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Improve the energy efficiency of their building.
We always support our clients in the preparation and validation of grant applications, in order to avoid rejections or delays.
Why entrust this type of project to AirGreen?
Installing a Multi F MAX system is not something to be done on a whim. At AirGreen , we provide:
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Field expertise acquired on hundreds of complex HVAC projects.
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Certified refrigeration technicians experienced with large-capacity multi-zone systems.
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$5 million in liability insurance , essential for large-scale projects.
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Transparent pricing , confirmed before work begins.
Our approach is based on technical precision, clear communication and respect for customer expectations, from the first quote to after-sales service.
Next Step
For a residential, commercial, or multi-unit project in the Montérégie region , Montreal , Laval , Longueuil , on the South Shore or North Shore , contact AirGreen today. We will analyze your building, your actual needs, and propose a sustainable, high-performance HVAC solution perfectly suited to your situation.
Request your personalized quote and benefit from AirGreen's expertise for your multi-zone heat pump 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: 31,600 BTU/h at −8 °C, 44,000 at −15 °C.
How many heads can I connect?
Up to 6 on this outdoor unit. This product is configured for 6 heads.
How much is the LogisVert grant?
$3,792 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 3621281. 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.