LG Multi F MAX LGRED R32 Heat Pump | 2 Heads at 48,000 BTU | Montérégie
The LG Multi F Max LGRED R32 48 000 multi-zone heat pump heats and cools 2 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.
2 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 multi-zone systems for many years in a wide variety of settings: high-end single-family homes, apartment buildings, professional offices, retail spaces, and mixed-use buildings. The LG Multi F MAX LGRED R32 – 48,000 BTU heat pump , configured here with two indoor units , is one of the solutions we recommend when flexibility, thermal stability, and long-term reliability are paramount.
This outdoor unit, the KUMXA481A , designed to supply up to 8 indoor zones , allows for future expansion. In the Montérégie region, where many buildings are expanded or renovated over several years, this expansion capacity represents a tangible advantage, often a decisive factor when selecting a multi-zone centralized HVAC system.
An LGRED R32 platform adapted to the Quebec climate
The core of this system is based on LGRED technology combined with R-32 refrigerant, a choice that meets both current environmental requirements and Quebec's climatic realities. Unlike some older multi-zone solutions, this heat pump maintains stable heating capacity down to -25°C , which is essential for ensuring winter comfort without excessive reliance on supplemental heating.
In our facilities in the Montérégie region , as well as in Montreal , Laval , Longueuil , on the South Shore and the North Shore , we have found that this type of system is particularly relevant for:
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buildings with several distinct occupancy zones,
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spaces with uneven thermal loads,
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projects where visual and sound discretion is important.
Key technical specifications of the KUMXA481A model
The LG Multi F MAX LGRED R32 – 48,000 BTU heat pump stands out with technical parameters designed for intensive and long-lasting use:
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Rated cooling capacity : 48,000 BTU
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Heating capacity : reliable operation down to −25 °C
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Refrigerant : R-32 , more efficient and with a lower environmental impact
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Supported areas : 2 to 8 indoor units
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Electrical voltage : 208-230 V
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MCA : 34 A
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MOP : 40 A
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Outdoor noise level : approximately 56 dB(A)
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Built-in Wi-Fi for remote control and energy management
These parameters correspond to the configurations that we actually install on the ground in residential and commercial projects.
A realistic and measurable energy yield
Unlike some product descriptions that display unrealistic values, we always emphasize performance indicators that conform to North American standards . The efficiency of this system relies primarily on:
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a variable speed scroll compressor ,
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precise power modulation according to actual demand,
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intelligent refrigerant distribution to each zone.
In practice, this translates into controlled energy consumption , a stable temperature in each space and a significant reduction in short cycles, which are often responsible for premature wear of equipment.
Selection and compatibility of indoor units
One of the major advantages of the LG Multi F MAX is its compatibility with several models of high-efficiency wall units, including:
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KNUAB091A (9000 BTU)
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KNUAB121A (12,000 BTU)
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KNMAB151A (14,300 BTU)
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KNUAB181A (18,000 BTU)
At AirGreen, we size each zone according to the actual heat load, not according to an approximate rule. In a recent project in Boucherville , for example, we combined an 18,000 BTU unit for an open-plan space with a 12,000 BTU unit for a closed office area, all powered by the same outdoor unit.
Refrigeration network and professional installation
This system allows for significant pipe lengths , with advanced management of elevation differences between units. This offers great design freedom, particularly useful in multi-story buildings or those with complex architectural constraints.
However, this flexibility requires a rigorous HVAC installation :
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precise calculation of equivalent lengths,
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strict adherence to pipe diameters,
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proper installation of distribution units,
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commissioning with complete procedures and thorough checks.
This is precisely where AirGreen's expertise makes the difference. A poorly installed multi-zone heat pump may function, but never at its full potential.
LogisVert subsidy and long-term value
To date, this model is eligible for the LogisVert provincial grant , which can reach $4,200 , depending on the building's configuration and eligibility. We systematically assist our clients in preparing their application, as incomplete documentation is one of the most frequent reasons for rejection.
Beyond the subsidy, this system represents a structuring investment :
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evolving over time,
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compatible with renovation or extension projects,
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backed by a 10-year warranty on parts and compressor and a 6-year labor warranty, straight from the distributor.
Why entrust your project to AirGreen
At AirGreen, we don't just sell equipment. We design complete HVAC solutions , adapted to the local realities of Montreal , Laval , Longueuil , the North Shore , the South Shore and the Montérégie region.
Our approach is based on:
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a detailed thermal analysis,
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complete transparency regarding costs,
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experienced refrigeration technicians,
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$5 million liability insurance,
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a structured and accessible after-sales service.
Each installation is documented, tested and explained to the client, in order to ensure optimal long-term use.
A reliable multi-zone solution for today and tomorrow
The LG Multi F MAX LGRED R32 heat pump – 2 heads, 48,000 BTU – is designed for homeowners and managers seeking a high-performance, adaptable solution that meets current heating and cooling standards. When properly sized and installed, it provides consistent comfort, measurable energy efficiency, and lasting peace of mind.
Contact AirGreen
To obtain a detailed quote , confirm your eligibility for the LogisVert grant , or discuss your HVAC installation project in the Montérégie region, contact AirGreen Heat Pumps, Air Conditioning & Heating directly. Our team will assist you every step of the way, from the initial analysis to final commissioning.
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 2 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.