LG Multi F MAX LGRED R32 Heat Pump | 4 Zones + 42000 BTU | Montérégie
The LG Multi F Max LGRED R32 42 000 multi-zone heat pump heats and cools 4 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.
4 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 demanding Quebec buildings
At AirGreen Heat Pumps, Air Conditioning & Heating , we have been installing HVAC systems designed to meet the climatic and architectural realities of Quebec for over 15 years. The LG Multi F MAX LGRED R32 – 4 zones, 42,000 BTU heat pump fits perfectly into this approach: a robust, precise and scalable multi-zone system, capable of providing heating and cooling in complex single-family homes, duplexes, multigenerational homes or small commercial buildings in Montérégie , Montreal , Laval , Longueuil , on the North Shore and the South Shore .
This model is based on a KUMXA421A outdoor unit, compatible with up to 6 indoor units , allowing for a customized configuration to suit the specific needs of each zone. This is precisely the kind of flexibility sought by homeowners looking to replace an energy-inefficient central system or modernize a building with limited space.
Why the Multi F MAX LGRED R32 stands out on the field
A truly independent management of the areas
Unlike traditional systems where a single setting dictates the behavior of the entire house, the LG Multi F MAX heat pump allows for independent zone control . Each indoor unit can operate according to its own schedule and temperature: bedrooms, living rooms, offices, or separate living spaces thus benefit from precise comfort without unnecessary overconsumption.
In our projects in Boucherville , Saint-Bruno-de-Montarville and Longueuil , this type of configuration has significantly reduced complaints related to temperature differences between floors, a very common problem in multi-level buildings.
Actual performance in Quebec's cold climate
The LGRED R32 outdoor unit is designed to maintain stable heating capacity down to -25°C , a key requirement for a sustainable HVAC system in Quebec. Unlike some less suitable multi-zone solutions, this system retains usable power even during periods of intense cold, thus reducing the need for supplemental electric heating.
R-32 refrigerant: efficiency and environmental responsibility
The choice of R-32 refrigerant is not insignificant. It offers:
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A lower global warming potential than older refrigerants.
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Improved thermodynamic efficiency.
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A reduced refrigerant charge for an equivalent capacity.
In a context where environmental standards are evolving rapidly, this choice ensures regulatory sustainability and added value to the building.
Key technical data that really matters on the construction site
Rather than overwhelming owners with theoretical and unrepresentative figures, we focus on the parameters that have a concrete impact during installation and daily use:
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Cooling capacity : 42,000 BTU
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Active zones : 4 (expandable up to 6 depending on the configuration)
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Voltage : 220 V
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MCA : 33 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
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ENERGY STAR® certified , including the cold climate category
These elements directly influence electrical compatibility, the location of the outdoor unit, as well as the tranquility of the occupants — points that our refrigeration technicians systematically analyze during technical visits.
Installation flexibility: a decisive advantage in renovation
Pipe lengths and elevation changes adapted to existing buildings
The Multi F MAX LGRED allows for very long total pipe lengths and significant elevation differences between units, facilitating integration into existing buildings without major structural work. This feature is particularly valued in renovation projects in Montreal and on the South Shore , where architectural constraints are common.
We recently installed this system in a duplex in Saint-Lambert , where the distance between the outdoor unit and the last indoor unit far exceeded what conventional wall-mounted systems allow. The result: a clean installation without compromising performance.
Wide selection of indoor units
The system accepts several models of LG indoor units: wall-mounted, console, or compact ducted units. This versatility allows for adapting the aesthetic appearance and air distribution to each space, an aspect often overlooked when initially choosing a heat pump.
LogisVert subsidy and long-term profitability
The LG Multi F MAX LGRED R32 heat pump is eligible for the LogisVert provincial subsidy , with an amount of up to $3,792 depending on the building's configuration and eligibility. At AirGreen , we support our clients in Montreal , Laval , and the Montérégie region through every step:
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Validation of eligibility.
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Compliant technical documentation.
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Post-installation coordination.
Beyond the subsidy, reducing energy consumption and intelligent zone management allow for sustainable optimization of operating costs , particularly in multi-unit residential buildings.
Common mistakes avoided thanks to our field experience
Over the years, we have observed several recurring errors in multi-zone projects:
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Undersized outdoor unit.
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Poor distribution of resources between zones.
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Inadequate choice of outdoor location resulting in noise or snow accumulation.
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Pipe lengths not optimized.
Our approach is based on a comprehensive thermal analysis , precise planning of the refrigeration network, and installation that meets the manufacturer's requirements. This meticulous approach guarantees the system's long-term reliability.
Why entrust the installation to AirGreen
Choosing AirGreen means benefiting from:
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Certified refrigeration technicians with extensive experience in LG multi-zone systems.
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$5 million in liability insurance .
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Transparent pricing , validated before work begins.
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A structured and responsive after-sales service.
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With in-depth knowledge of the local realities of Montreal , Laval , Longueuil , North Shore , South Shore and Montérégie .
Each installation is conceived as a unique project, not as a simple installation of equipment.
Conclusion
The LG Multi F MAX LGRED R32 4-zone, 42,000 BTU heat pump is a complete HVAC solution for homeowners seeking performance, flexibility, and energy efficiency in demanding climates. When properly configured and installed, it will permanently improve a building's comfort while keeping costs under control.
To obtain a detailed quote , confirm your eligibility for LogisVert subsidies , or discuss your project in the Montérégie region , Montreal , Laval , Longueuil , on the North Shore or South Shore , contact AirGreen Heat Pumps, Air Conditioning & Heating directly. Our team will support you with a clear, technical, and results-oriented approach.
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 4 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.