LG MULTI F MAX R32 8-Zone Heat Pump | 54,000 BTU Compressor
The LG Multi F Max R32 54 000 multi-zone heat pump heats and cools 8 rooms with a single outdoor unit. it delivers 37,200 BTU/h at −8 °C, heats down to −16 °C and qualifies for a $1,860 LogisVert grant. Installed by AirGreen in Montréal, Laval, Longueuil, the North Shore and the South Shore.
8 rooms, one outdoor unit, and the most powerful in its class at −8 °C.
Compared with the 7 multi-zone systems of 54,000 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 48,000 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 72 % 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. $50 per 1,000 BTU/h is the rate for ENERGY STAR heat pumps (guide v1.10).
Where it ranks among same-size multi-zone systems.
Compared with the 7 multi-zone systems of 54,000 BTU we sell, using the LogisVert list figures. Weaknesses too, said plainly.
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 have been installing multi-zone HVAC systems for many years in a wide variety of settings: high-end single-family homes, duplexes and triplexes, multi-unit residential buildings, professional offices, and light commercial buildings in Montreal , Laval , Longueuil , and on the North and South Shores . The LG MULTI F MAX R32 8-Zone heat pump – 54,000 BTU – is specifically designed for these projects where a traditional central system cannot meet architectural, zoning, or energy efficiency requirements.
This model is based on a clear principle: a single powerful outdoor unit capable of powering up to eight independent indoor units , each with its own temperature control, airflow, and specific function. This approach eliminates the usual compromises associated with centralized systems while maintaining rigorous energy management.
Why the multi-zone concept is particularly relevant in Quebec
In our climate, heating and cooling needs vary greatly from room to room: a south-facing office in Boucherville , a two-story apartment in Laval , or even a renovated older building in Montreal never have uniform heat loads. The LG MULTI F MAX allows you to:
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to precisely adapt the power to each zone,
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to reduce unnecessary cycles,
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to optimize actual electricity consumption,
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to improve occupant comfort without oversizing.
We observe in the field that this type of system significantly reduces complaints related to temperature differences between rooms, particularly in multi-unit dwellings where each occupant has different expectations.
Key technical specifications of the 54,000 BTU compressor
The system is based on the LG KUMXB541A outdoor unit, equipped with a variable speed scroll compressor , known for its stability and longevity under partial load as well as full demand.
Among the most relevant technical data for a serious HVAC installation project:
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Cooling capacity : 54,000 BTU
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Heating capacity down to -16°C , with continued useful power output in winter conditions.
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R-32 refrigerant , more thermally efficient and with a reduced environmental impact
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High SEER2 , leading to lower operating costs over time
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MCA: 34 A / MOP: 40 A , facilitating electrical integration in many existing buildings
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Controlled outdoor noise level (55 dB(A)) , a crucial point in dense urban environments
These parameters allow for reliable integration in both residential and commercial settings, without compromising on electrical or acoustic compliance.
Complete flexibility in the choice of indoor units
One of the major advantages of the LG MULTI F MAX system lies in the diversity of compatible indoor units. At AirGreen, we configure each project to your specifications by combining, according to your needs:
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compact wall units for bedrooms and offices,
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Discreet ducted units for common areas
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consoles or ceiling lights in spaces with architectural constraints.
This freedom of configuration is essential in existing buildings in Longueuil or on the North Shore , where ceilings, load-bearing walls and air circulation often limit standard solutions.
Advanced airflow management and acoustic comfort
Each indoor unit operates independently, with:
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automatic control of vertical and horizontal shutters ,
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dynamic adaptation of airflow,
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indoor noise levels as low as 29 dB(A) depending on the model.
In the projects we undertake, particularly in multi-unit residential buildings in Montreal , this operational silence is a determining factor in long-term satisfaction.
Refrigeration system design and pipe lengths: a real asset in renovation
Unlike many more limited multi-zone systems, the LG MULTI F MAX allows for very generous pipe lengths:
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up to 475 ft in total equivalent length ,
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significant differences in elevation between indoor and outdoor units,
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precise management of the refrigerant charge.
This flexibility is particularly useful in multi-story buildings or conversion projects (e.g., a former commercial building converted into housing on the South Shore ). At AirGreen, we integrate these parameters from the design phase to avoid any long-term performance loss.
AirGreen Case Study: A Real-World Example in Multi-Dwelling Buildings
In a recent project in Laval , we installed an LG MULTI F MAX 8-zone system in a renovated six-unit apartment building. The challenges were numerous: limited exterior access, high acoustic requirements, and varying occupancy profiles. After commissioning:
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The measured energy consumption was lower than initial estimates.
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Each dwelling benefits from independent thermal control.
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no negative feedback related to noise or system stability after a full season.
This type of result illustrates why we prefer this model for complex projects.
Subsidies and energy efficiency
The LG MULTI F MAX R32 heat pump is eligible for certain provincial subsidies , including the LogisVert program, depending on the chosen configuration. At AirGreen, we systematically support our clients in Montreal , Laval , Longueuil , the North Shore , and the South Shore with:
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validation of eligibility,
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the preparation of the required documents,
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Optimizing the choice of units to maximize financial assistance.
This step is often overlooked elsewhere, even though it can represent a significant financial lever.
HVAC Installation: Why Expertise Makes All the Difference
A multi-zone system of this scale allows for no approximations. At AirGreen, every installation is carried out by certified refrigeration technicians , with:
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precise calculation of thermal loads,
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Strict adherence to LG requirements
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pressure tests, vacuuming and documented commissioning
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Post-installation support and real follow-up.
It is this rigor that guarantees the durability of the system and the stability of performance, year after year.
Who is the LG MULTI F MAX 8-Zones really aimed at?
This model is particularly suitable for:
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owners of multi-unit dwellings ,
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high-end homes with multiple comfort zones,
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professional offices and clinics,
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lightweight commercial projects requiring flexibility and efficiency.
It provides a credible alternative to cumbersome centralized systems, while offering much finer control.
Why entrust your project to AirGreen
Choosing AirGreen means ensuring:
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recognized local HVAC expertise ,
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clear and agreed-upon pricing before work begins,
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of an installation that meets the strictest standards,
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of an accessible and structured after-sales service.
We never propose a multi-zone system without a clear technical justification. Each project is thoroughly analyzed to guarantee a consistent, sustainable, and cost-effective result.
Conclusion
The LG MULTI F MAX R32 8-Zone heat pump – 54,000 BTU – represents a robust, flexible solution perfectly suited to the realities of Quebec buildings. When properly designed and installed, it offers a level of comfort and efficiency that is hard to beat.
To obtain a detailed quote , discuss your project, or validate the technical feasibility of your installation in Montreal , Laval , Longueuil , on the North Shore or South Shore , we invite you to contact AirGreen directly. Our team will be pleased to assist you with professionalism and transparency.
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: 37,200 BTU/h at −8 °C, 39,000 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?
$1,860 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, ID 3621275. It also meets the ENERGY STAR Most Efficient criteria, according to the ENERGY STAR database.
Down to what temperature does it heat?
Down to −16 °C.
Is it noisy?
Indoors, the reference head goes down to 29 dB(A). Outdoors, 55 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.