LG

LG TripleZone MULTI F R32 Heat Pump | 48000 BTU Compressor

In stock
SKU: UMXB481A
48,000BTU/h · 3 heads
−16 °Cheats down to
$1,690LogisVert, indicative
ENERGY STAR®ENERGY STAR Most EfficientWi-Fi includedR-32Up to 8 heads
Talk to a technician · 514 316-2973
Outdoor unit UMXB481APossible indoor models KNUAK091A, KNUAK121A, NUAK181A, KNMAB071A, KNUAB091A, KNUAB121A, KNMAB151A, KNUAB181A, KNMAB241AAHRI 215402339· ENERGY STAR 3621273
In short

The LG Multi F R32 48 000 multi-zone heat pump heats and cools 3 rooms with a single outdoor unit. it delivers 33,800 BTU/h at −8 °C, heats down to −16 °C and qualifies for a $1,690 LogisVert grant. Installed by AirGreen in Montréal, Laval, Longueuil, the North Shore and the South Shore.

01 · The verdict in 10 seconds

3 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.

ENERGY STAR Most EfficientNEEP 389373AHRI 215402339LogisVert · October 1, 2026
+Only 55 dB(A) outdoorsRank 1 (tied) of 82. Class median: 64 dB(A).
+COP 2.17 at −15 °CRank 5 (tied) of 71. Class median: 2.00.
+EER2 12.8Rank 15 (tied) of 78. Class median: 12.0.
!Good to know: heats down to −16 °CRank 76 of 82; class median: −25 °C.
33,800BTU/h certified at −8 °C
−16 °Cstill heating
3 → 8heads, on the same unit
2.48COP at −8 °C
$1,690LogisVert, indicative
02 · The machine

The parts that make a multi-zone system.

Tap a part to learn more.

UMXB481A

Outdoor unit

One compressor for the whole house. It supplies up to 8 heads and modulates from 12,420 to 46,500 BTU/h depending on what the rooms call for (NEEP).

03 · How it works

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.

04 · My plan

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.

05 · The series

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.

Outdoor2 zones3 zones4 zones5 zones6 zones7 zones8 zones
18,000BTU
2
24,000BTU
23
30,000BTU
234
36,000BTU
234
48,000BTU
2Here45678

LG Multi F R32 48 000 · 3 zones

33,800 BTU/h
at −8 °C
$1,690
LogisVert

Up to 8 heads on this outdoor unit. Tap another box to see that size.

06 · Deep cold

At −15 °C, it still delivers 78 % 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.

+8.3 °C
12,420 → 59,000 BTU/h
-8 °C
13,950 → 46,500 BTU/h
-15 °C
12,555 → 39,600 BTU/h
Source: NEEP, minimum, rated and maximum ratings at 47, 17 and 5 °F.
07 · The bill

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.

08 · Efficiency

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.

SEER2 · seasonal cooling20.5
Scale 1 – 30Median: 21.3
Rank 54 (tied) of 78 in its class.
HSPF2 · seasonal heating9.5
Scale 1 – 15Median: 10
Rank 56 (tied) of 78 in its class.
EER2 · cooling in peak heat12.8
Scale 1 – 20Median: 12
Rank 15 (tied) of 78 in its class.
COP at −15 °C2.17
Scale 0 – 4Median: 2
Rank 5 (tied) of 71 in its class.
ENERGY STAR Most EfficientCold climate · ID 3621273 · ENERGY STAR database
09 · LogisVert grant

A grant you can calculate, not guess.

33,800 BTU/h÷ 1,000 ×$50=$1,690

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).

Set for this system (AHRI 215402339). Another head combination (ducted, console) can change the AHRI number, and so the amount.
Cap: the grant never exceeds 100 % of the purchase and installation cost before taxes.
9 months after installation to apply; +5 % when two measures are in the same request.
All about LogisVert, with the simulator
10 · Report card

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.

11 · Head-to-head

Against three other brands in its class.

Same rated size, other manufacturers. Pick the opponent.

12 · Multi-zone or wall units

One multi-zone or several wall units? Both sides, honestly.

This multi-zone3 wall units
On the wall1 outdoor unit3 outdoor units
Electrical1 dedicated circuitOne circuit per unit
CapacityShared between roomsReserved for each room
If the outdoor unit stopsEvery zone stopsOnly one room
ModesSame mode everywhereEach room chooses
LogisVert$1,690 for the systemDepends on each model

We compare both options on your floor plan during the estimate.

13 · Installation

What to know before installing a multi-zone system.

Dimensions, wiring and lines, drawn. Then our six steps.

The outdoor unit, dimensioned

54.34 in
UMXB481ADepth 15.66 in
37.41 in
Dimensions: product sheet (W × D × H).

One circuit for the whole house

Electrical panel
Load calculation before the quote
40 A max. breaker
MCA 34 A · 220 V
Outdoor unit
Head 1
Head 2
Head 3
Our RBQ licence covers electrical work (subclass 16).
01Room-by-room visit and surveyWe measure each zone and note insulation and windows. The on-site estimate is free.
02Heads and line layoutOne pair of lines per head.
03Outdoor unit baseAbove the snow line, away from the neighbours’ bedroom windows.
04Exposed, finished linesLines under line covers, no work inside the walls.
05Dedicated circuit220 V, MCA 34 A, 40 A protection. The panel load calculation is done before the quote.
06Commissioning, zone by zoneEach head is tested and the controls set up. Then the LogisVert application within 9 months.
14 · Sound

Published sound levels, on one scale.

We use the outdoor figure to choose where the unit goes.

29
38
55
28
64
20 dB(A)3040506070
29 Reference head, lowest speed38 Reference head, highest speed28 Class indoor median55 Outdoor unit64 Class outdoor median
Values in dB(A). Indoor values are those of the sheet’s reference head; each head has its own, confirmed for the chosen model. Municipal noise by-laws vary by borough.
15 · What sets it apart

What is particular about this machine.

Only facts published by ENERGY STAR, NEEP or the manufacturer.

Most EfficientENERGY STARAmong the year’s most efficient according to ENERGY STAR.
46,500BTU/h peak at −8 °CIts maximum capacity certified by NEEP, above its rated value.
12,420BTU/h at low speedMinimum certified capacity (NEEP): it slows down instead of stopping when a single room calls.
−20 °CColdest certified pointNEEP still lists 34,500 BTU/h at a COP of 1.91 at −4 °F.
120 WBase pan heaterHeater in the outdoor unit’s base pan, against ice (NEEP).
675R-32 GWPGlobal warming potential of R-32, versus 2,088 for R-410A (ENERGY STAR).
16 · Specifications

Every number, and where it comes from.

Each line carries its source; a line with no published value is not shown.

Performance
Cooling capacity (size)48,000 BTUSheet
Certified cooling at 35 °C48,000 BTU/hNEEP
SEER2 (seasonal cooling efficiency)20.5AHRI
EER2 (instant cooling efficiency)12.8AHRI
HSPF2 (seasonal heating efficiency, region IV)9.5AHRI
HSPF2, region V (coldest)7.9NEEP
Heating
Capacity at +8.3 °C54,000 BTU/h · COP 3.5NEEP
Capacity at −8 °C33,800 BTU/h · COP 2.48NEEP
Capacity at −15 °C37,800 BTU/h · COP 2.17NEEP
Capacity at −20 °C (max.)34,500 BTU/h · COP 1.91NEEP
Modulation range12,420 – 46,500 BTU/hNEEP
Heats down to−16 °CSheet
Zones and heads
Zones on this product3 Zones (Triple Zone)Sheet
Maximum zones8 ZonesSheet
Possible indoor modelsKNUAK091A, KNUAK121A, NUAK181A, KNMAB071A, KNUAB091A, KNUAB121A, KNMAB151A, KNUAB181A, KNMAB241ASheet
Indoor dimensions (W × D × H)32.94 x 7.56 x 12.13 inSheet
Vertical louversAutoSheet
Horizontal louversAutoSheet
Airflow (reference head)459 CFMSheet
Indoor sound (reference head)29 – 38 dB(A)Sheet
Installation
Outdoor unit (W × D × H)37.41 x 15.66 x 54.34 inSheet
Outdoor sound55 dB(A)Sheet
Base pan heater120 WNEEP
Electrical
Voltage220 VSheet
MCA (minimum circuit ampacity)34 ASheet
MOP (maximum overcurrent protection)40 ASheet
RefrigerantR-32Sheet
Wi-FiIncludedSheet
Certifications and warranty
AHRI215402339AHRI
ENERGY STARYes · ID 3621273ENERGY STAR
ENERGY STAR Most EfficientYesENERGY STAR
LogisVert grant (indicative)$1,690LogisVert
Warranty (compressor · parts · labour)10 yrs · 10 yrs · 0 yrsSheet
AirGreen extended warrantyPossibleSheet
17 · Official brochures

The manufacturer’s documentation, as PDF.

18 · Description

Everything we have written about this system.

A multi-zone architecture designed for the real comfort of homes and plexes in Greater Montreal

In real life, a property never has "just one ideal temperature." The living room in an open-concept space receives solar gain, the kitchen generates heat daily, the bedrooms require more discreet comfort at night, and the basement often dictates a completely different approach. It is precisely in this type of situation that a multi-zone heat pump becomes so valuable.

The LG TripleZone MULTI F R32 Heat Pump | 48,000 BTU Compressor (outdoor unit UMXB481A ) is designed to power multiple indoor units, distribute energy according to the demand of each room, and maintain stable comfort in typical Montreal , Laval , Longueuil , North Shore and South Shore contexts: multi-storey houses, plexes, partial renovations, additions, and condominiums where needs change from one zone to another.

At AirGreen , we find that this type of product becomes particularly relevant when the owner wants to:

  • avoid compromises (one room too hot, another too cold);

  • reduce manual adjustments (thermostats and endless remote controls);

  • to obtain a more stable system, which works continuously rather than in "power surges";

  • to implement a modern, clear, and easy-to-use solution for everyday life .


What “48,000 BTU” actually means in a multi-zone system

The figure 48,000 BTU corresponds to the nominal cooling capacity of the outdoor unit. But in a multi-zone configuration, what matters is not just the "total" capacity: it's the ability to modulate , to prioritize one zone over another, and to respond to varying loads, minute by minute.

In practical terms, this allows for very common scenarios:

  • The family room in full sun requires a significant effort in the afternoon;

  • the rooms require a gentler touch in the evening;

  • A closed office used for teleworking deserves stable comfort at fixed times;

  • A basement requires slower, more constant, often less aggressive control.

Instead of operating in a simple "on/off" fashion, the system adjusts its speed to match the demand. The result: a more stable temperature , a greater sense of comfort , and often more logical energy consumption over the season.


The advantage of multi-zone management: managing three zones, but also a single energy strategy

A multi-zone system isn't just about adding up indoor units. It's a comfort strategy . The outdoor unit acts as a central hub, intelligently distributing energy. Once properly configured, the system becomes incredibly easy to use: you live, and the machine adjusts.

Examples of typical layouts (and why they work)

  • Two-story house : living area on the ground floor + bedrooms upstairs + office/basement.

  • Plex (duplex / triplex) : one zone per floor, or one “day” zone + two “night” zones.

  • Rear extension : the extension often has windows and a different thermal load: a dedicated area avoids overloading the rest.

  • Partially renovated property : the focus is on living and sleeping areas without redoing the entire central layout.

In these cases, a well-sized multi-zone system often solves a recurring problem: the feeling that "the unit is forcing" or that "it's blowing too hard" in a room, because we are trying to compensate elsewhere.


R-32: a modern base, useful for efficiency and stability

The R-32 refrigerant is part of the logical evolution of the sector. For the owner, the most tangible difference is seen primarily in the result: a modern appliance, with a design that aims for good efficiency and stable performance over the seasons.

What matters on a daily basis:

  • a more flexible response under partial load (most of the time);

  • a good balance between comfort and consumption;

  • a current technical platform, with a finer control logic.


Heating: how to read performance usefully, here in our own home

In Greater Montreal, heating isn't a "bonus." It's a major necessity. When choosing a heat pump, you want to know what it can actually deliver when temperatures drop.

The key point is simple: a heat pump can be very efficient, but it must be well chosen and properly installed . With a multi-zone system, this also means ensuring that the distribution of the indoor units corresponds to the actual layout of the rooms.

At AirGreen, we take the time to think about these elements:

  • the actual insulation (not the one “on paper”);

  • exposure (south-facing vs shaded);

  • air volumes (high ceilings, stairwells);

  • the areas that should be given priority (bedrooms, office, open area);

  • the way the family uses the space (presence, schedules, doors closed/open).

Because even the best machine in the world becomes average if the zone strategy is inconsistent.


A relevant product when the house has “complex” thermal behaviors

Some buildings in Greater Montreal have well-known characteristics:

  • brick facades, significant thermal inertia;

  • interior staircases that allow hot air to rise;

  • rooms in a row, variable air circulation;

  • extensions or renovations creating an imbalance;

  • Partially finished basements that "pull" comfort down.

In these cases, a multi-zone approach provides a structured solution: you don't fight the house, you work with it . You give each zone the necessary tools to be comfortable, and you avoid overworking a single unit.


Example of an AirGreen site: three zones, three uses, a single control logic

We often work on scenarios where the client explains:

  • "the room is always colder";

  • "the living room overheats as soon as there is sun";

  • "The basement is damp and uncomfortable in the summer."

In a TripleZone configuration, the zones can be organized so that:

  1. the living room/open area manages peak loads (sunlight, cooking, gatherings);

  2. the chambers remain in maintenance mode, quieter, more stable;

  3. the basement obtains a more constant temperature, without overheating.

The notable difference is seen in the routine: fewer variations, fewer complaints, and a feeling that the house is "balanced".


Installation: where a multi-zone system gains or loses its value

A multi-zone system is very efficient… if the installation is done correctly. At AirGreen, we consider installation an essential part of the final performance.

1) Route planning and aesthetics

In Montreal, Laval, and Longueuil, many homeowners want:

  • discreet refrigeration pipes;

  • pipe covers that are properly aligned;

  • an outdoor unit that is well positioned, without obstructing the passageway or the courtyard.

These are good expectations. But the aesthetics must remain compatible with:

  • accessibility for maintenance;

  • protection against ice and snow;

  • proper air circulation;

  • vibration reduction.

It is often in these details that we see the difference between a "correct" installation and a clean and sustainable one.

2) Supports, vibrations and noise: managing the neighborhood

In tighter courtyards or with walls close together, the perceived noise depends greatly on the medium and transmission.

Our typical best practices:

  • choose the right support (on the floor or wall depending on the context);

  • limit structural transmission;

  • avoid areas of resonance (corners, close parallel walls);

  • plan a position that respects interior comfort (bedroom windows, etc.).

The result is not just “less dB”. It's a better quality of life, and fewer daily irritants.

3) Drainage and management of winter conditions

In winter, a heat pump must handle defrosting. If the location is poorly chosen, you end up with:

  • ice accumulation;

  • slippery areas;

  • problematic drainage;

  • maintenance is more difficult.

We position the outdoor unit to:

  • avoid critical accumulations;

  • allow adequate clearance;

  • protect the components from splashes of water and snow.


Choosing the right indoor units: the key to a truly comfortable TripleZone system

A TripleZone system is not simply defined by "three identical heads." In practice, the choice of indoor units must reflect:

  • the size and use of each piece;

  • thermal load (sun, windows, kitchen);

  • the desired noise level (bedrooms vs living areas);

  • possible air circulation (doors often closed, corridors, etc.).

A simple logic that we often apply

  • Daytime area (lounge/open area): priority on capacity and distribution.

  • Night area (bedrooms): priority on stability, silence, and support.

  • Basement/office area : priority on consistency and adaptation to summer humidity.

This logic seems obvious, but it avoids a common mistake: installing unsuitable indoor units and then trying to "correct" them through programming. A good hardware foundation simplifies everything.


Programming and habits: getting the most out of life without complicating things

A multi-zone system becomes truly valuable when used intelligently. We often recommend:

  • realistic guidelines (avoid going from 18 to 25 all at once);

  • simple schedules (maintained when the area is not occupied);

  • using Wi-Fi to better track and adjust.

The biggest gain isn't a "secret trick." It's consistency: a stable system works better than a system that's forced.


Electrical: a non-negotiable step for a clean installation

On a device of this category, the electrical aspects must be thoroughly checked:

  • panel capacity;

  • caliber of the protective devices;

  • spinning path;

  • compliance with safety rules.

At AirGreen, this step is part of our standard approach, because performance is useless if the system is not installed flawlessly and in accordance with regulations.


Maintenance: what we clearly explain to homeowners

A multi-zone heat pump remains simple to maintain, but two things need to be understood:

  1. Multiple indoor units mean multiple filters and points of attention.

  2. The stability of the system depends on good air circulation.

What really helps

  • Regular cleaning of the filters (simple, quick);

  • keep areas clear (curtains, furniture blocking air);

  • plan periodic maintenance (especially before the peak seasons).

A structured interview improves:

  • temperature stability;

  • air quality;

  • consumption;

  • and the overall lifespan.


Common mistakes to avoid (and how we prevent them from the start)

1) Size by feel

A south-facing glass-enclosed room can be surprising. A stairwell can absorb heat. We design the space taking into account the realities of the building.

2) Neglecting volumes and heights

High ceilings, mezzanines, and open spaces change everything. The area must be designed for air distribution, not just for square footage.

3) Install without thinking about future service

A multi-zone system must remain accessible for maintenance, diagnostics, and future interventions. We avoid "impossible" locations that create unnecessary costs later on.

4) Create areas that contradict each other

A zone heated to the max and a zone cooled at the same time: poor comfort, poor energy efficiency. We are implementing a coherent setpoint strategy.


Why choose AirGreen for this type of LG TripleZone?

This product has real value when installed with a holistic approach: comfort, aesthetics, compliance, and actual use. At AirGreen , our approach is distinguished by:

  • a practical reading of the needs (building + habits);

  • proper planning of pathways and integration;

  • a structured installation, designed for sustainability;

  • a service geared towards resolution, not temporary solutions.

We work every week in Montreal , Laval , Longueuil , on the North Shore and the South Shore , and we know the typical constraints: plexes, tight yards, brick facades, limited access, and high expectations for the finish.


A coherent solution for precise comfort, zone by zone, all year round

The LG TripleZone MULTI F R32 Heat Pump | 48,000 BTU Compressor is particularly suitable when:

  • the house has different living areas;

  • Comfort must be stable, quiet, and intelligently managed;

  • You want a modern, multi-zone solution without constant compromises.

It's a solid option for those who want a system that adapts to the home, rather than the other way around.


Next Step

For an on-site estimate and clear recommendations (zone allocation, choice of indoor units, exterior integration, electrical compliance) in Montreal , Laval , Longueuil , on the North Shore or South Shore , contact AirGreen . We offer a logical, sustainable, and perfectly tailored multi-zone solution for your property.

19 · Questions

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: 33,800 BTU/h at −8 °C, 37,800 at −15 °C.

How many heads can I connect?

Up to 8 on this outdoor unit. This product is configured for 3 heads.

How much is the LogisVert grant?

$1,690 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 3621273. 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; labour is not included by the manufacturer. AirGreen extended warranty: possible.

AirGreen

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.

RBQ 5645-9605-01Ventilation 15.8, refrigeration 15.10, electrical 16
We handle the circuitOur licence covers the electrical work
LogisVert : $1,690AHRI 215402339 checked against the list of October 1, 2026
Beware of scamsHydro-Québec does no phone or door-to-door solicitation for LogisVert
Sources checked on October 1, 2026.NEEP, Cold Climate Air Source Heat Pump List, product 389373 (AHRI 215402339): capacities and COP, modulation, SEER2, EER2, HSPF2.ENERGY STAR certified heat pump database, ID 3621273.Hydro-Québec, LogisVert eligible heat pump list (owner, existing home), file of October 1, 2026; participation guide, version 1.10.Costs: Hydro-Québec Rate D, 11.142 ¢/kWh (second tier, since 1 April 2026). Amounts shown are estimates; only the responsible bodies confirm the grant awarded.