LG Multi F MAX LGRED R32 Heat Pump | 5 Heads at 48,000 BTU | Montérégie
The LG Multi F Max LGRED R32 48 000 multi-zone heat pump heats and cools 5 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.
5 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 demanding buildings in Quebec
In high-end residential projects, multi-unit buildings and commercial spaces in Montreal , Laval , Longueuil , the North Shore , the South Shore and the Montérégie region , the demand is clear: a multi-zone heat pump capable of offering independent room management, stable performance in winter heating and long-term mechanical reliability.
The LG Multi F MAX LGRED R32 – 48,000 BTU heat pump with 5 heads precisely meets these expectations, provided it is correctly selected, configured and installed , which is at the heart of AirGreen 's expertise.
This system is not a classic wall-mounted heat pump: it is a centralized multi-zone HVAC platform, designed to serve up to 8 indoor units , with a nominal capacity of 48,000 BTU in air conditioning and heating performance maintained down to -25°C , a fundamental criterion for the Quebec climate.
Technical architecture of the LG Multi F MAX LGRED R32 system
An outdoor unit designed for stability and longevity
The KUMXA481A outdoor unit is equipped with a variable-speed scroll compressor , using R-32 refrigerant, known for:
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energy efficiency superior to several previous generations
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a reduced refrigerant charge ,
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a reduced environmental impact .
Unlike simplified residential multi-zone systems, the Multi F MAX is based on a professional distribution logic , with the option to integrate branch distribution units (BDUs) . This architecture allows for:
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pressure stability in the refrigeration network,
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better capacity distribution when multiple zones are operating simultaneously
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a reduction in perceived temperature variations.
At AirGreen , we favour this type of system when the building configuration justifies a more advanced HVAC approach than standard multi-zone systems.
Actual capabilities and measured performance
Accuracy is key: some online marketing materials sometimes display unrealistic values. Here are the consistent and verified technical specifications for this model:
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Rated cooling capacity : 48,000 BTU
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Maximum heating capacity :
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up to 56,500 BTU at +8 °C ,
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approximately 45,200 BTU at -15°C ,
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guaranteed operation down to -25 °C .
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COP in heating (standard conditions) : approximately 3.6 to 3.8 , depending on the outside temperature.
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External noise level : ~ 56 dB(A) , remarkable for a unit of this capacity.
These performance levels explain why this system is eligible for ENERGY STAR® Cold Climate programs and the LogisVert grant from Quebec, currently valued at $4,200 , subject to overall project compliance.
Flexibility of indoor units: a real multi-zone advantage
Wide selection of indoor heads
The LG Multi F MAX allows you to combine different types and capacities of indoor units, including:
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9000 BTU (KNUAB091A),
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12,000 BTU (KNUAB121A),
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14,300 BTU (KNMAB151A),
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18,000 BTU (KNUAB181A).
This flexibility is essential in real-world projects: a condo, a duplex, or a commercial space never has uniform thermal requirements.
At AirGreen , we systematically perform a room-by-room analysis , taking into account:
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orientation,
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glazed surfaces,
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insulation,
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actual uses of the premises.
This avoids common mistakes: unnecessary oversizing, acoustic discomfort or cycles that are too short.
Air distribution and actual comfort
The LG wall units associated with this system offer:
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an automatic vertical and horizontal scan ,
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modulated ventilation ,
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interior noise levels as low as 27 to 29 dB(A) depending on the model and speed.
In several installations carried out by AirGreen in Boucherville and on the South Shore , this point was decisive for clients sensitive to noise, particularly in bedrooms or teleworking spaces.
HVAC Installation: Where Everything Really Happens
Refrigeration network and technical constraints
The Multi F MAX imposes strict rules:
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Total piping length may exceed 450 ft .
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Height differences between indoor and outdoor units can reach nearly 100 ft .
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Precise sizing of liquid (3/8") and gas (3/4") pipes.
A sloppy installation inevitably leads to:
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yield losses,
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defrosting defects,
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premature wear of the compressor.
This is precisely why AirGreen entrusts these projects only to certified refrigeration technicians , who are used to VRF / Multi F systems, and not to basic multi-zone installations.
AirGreen Experience Report – Montérégie
During a recent project in a multi-unit residential building in the Montérégie region , the client was hesitating between several multi-zone systems.
After analysis, the LG Multi F MAX was selected for:
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stability in winter heating ,
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the possibility of 5 independent zones with a single outdoor unit,
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compatibility with municipal acoustic requirements.
Result after a full winter:
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measured reduction in electricity consumption
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consistent temperatures despite variations in exposure,
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No complaints related to noise or defrosting.
Maintenance, reliability and long-term outlook
Recommended maintenance
A system of this scale requires:
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Regular cleaning of the internal filters,
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annual inspection of the refrigeration system,
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checking operating parameters and defrosting.
AirGreen offers tailored HVAC maintenance programs specifically designed for complex multi-zone systems.
Guarantee and peace of mind
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Compressor : 10 years
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Parts : 10 years
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Labor costs : 6 years, straight from the distributor, with the possibility of an AirGreen extended warranty
In large-scale projects, we systematically recommend an extended warranty , particularly in buildings with heavy use.
Why choose AirGreen for this type of heat pump?
Choosing the LG Multi F MAX LGRED R32 heat pump is a technical decision.
Choosing AirGreen means ensuring:
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from an honest and realistic selection of the system,
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of an HVAC installation compliant with LG and Quebec standards ,
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comprehensive support , from design to maintenance,
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with recognized expertise in Montreal, Laval, Longueuil, on the North Shore, the South Shore and in Montérégie .
Conclusion
The LG Multi F MAX LGRED R32 – 48,000 BTU, 5-head heat pump is a robust, scalable HVAC solution perfectly suited to complex projects in Quebec, provided it is properly designed and installed .
For a detailed quote , a personalized technical analysis or to validate eligibility for the LogisVert grant , contact AirGreen directly.
Our team will support you with the rigor and transparency that have built our reputation.
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 5 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.