LG MULTI F R32 4-Zone Heat Pump | 36000 BTU Compressor

A multi-zone solution designed for the real comfort of homes in Greater Montreal

A property almost never has a single “ideal temperature.” Between a living room with lots of windows, upstairs bedrooms, a cooler basement, a closed office, or a kitchen that heats up quickly as soon as cooking begins, heating needs are constantly changing. A multi-zone heat pump addresses this reality precisely: it allows you to manage comfort room by room rather than imposing a single setting on the entire house.

The LG MULTI F R32 4-Zone , with its KUMXB361A outdoor unit and 36,000 BTU cooling capacity, is designed for this type of smart use: up to 4 zones powered by a single outdoor unit, with power modulation that adapts to demand. In the Montreal , Laval , Longueuil , North Shore , and South Shore areas, this configuration is particularly relevant for:

• duplexes/triplexes where occupancy varies according to the floors;

• family homes where the rooms need to remain more stable at night;

• condos and cottages where the open area has very different needs than closed rooms;

• renovations where the aim is to modernize without rebuilding the entire layout of the building.

Why “4 zones” changes the quality of daily life

A well-designed multi-zone system isn't just about "adding units." It's about reducing compromises . In practical terms, this means:

• a comfortable living room even when the bedrooms remain cooler or warmer depending on the season;

• a pleasant office during the day without overheating the adjacent room;

• a basement maintained at a usable temperature (family room, gym, workshop) without the upper floor suffering;

• simpler settings, because each zone has its clear purpose.

At AirGreen , we always emphasize one point: a successful multi-zone system is a balanced project . Performance doesn't come solely from the machine itself. It comes from the coherence between the zones, the chosen indoor units, the piping layout, the commissioning, and the user habits.

The technical benchmarks that really matter

In a multi-zone project, we always keep an eye on the parameters that influence stability, reliability, and customer experience:

• Cooling capacity: 36,000 BTU

• Rated power: 36,000 BTU

• Refrigerant: R-32

• WiFi: included

• ENERGY STAR®: Yes

• AHRI: 215402337

• Voltage: 220 V

• MCA: 19 A and MOP: 25 A

• Outdoor noise level: 54 dB(A)

• Warranty (compressor – parts – labor): 10-10-0 years , with optional additional warranty available depending on applicable programs.

On the indoor unit side, multi-zone compatibility allows for several combinations (depending on the sizing), with common choices including: KNUAK091A, KNUAK121A, NUAK181A, KNMAB071A, KNUAB091A, KNUAB121A, KNMAB151A, KNUAB181A, KNMAB241A . This variety is valuable: a bedroom is not sized like an open-plan space, and a sunny room is not sized like a shaded room.

AirGreen Case Study: 4 Zones in a Brick Duplex in Montreal

In several Montreal neighborhoods, duplexes share a similar layout: brick, exterior staircases, enclosed rooms upstairs, and a living area on the ground floor. In a typical recent project, the objective was very clear:

• stabilize the rooms at night;

• improve the comfort of the ground floor in summer;

• reduce the use of auxiliary electric heating;

• Avoid installing multiple outdoor units (limited space and aesthetic concerns).

The multi-zone solution enabled a "day/night" logic:

• Zone 1: open area (living room/kitchen), sized to absorb solar gain and occupancy;

• Zone 2: main bedroom , more stable and quieter in operation;

• Zone 3: second bedroom/office , variable use;

• Zone 4: basement or multipurpose room , maintained at a constant temperature without over-consuming.

The desired result wasn't "maximum power." It was consistent comfort and easy operation . When the system is well-balanced, the homeowner makes fewer adjustments, and the heat pump works better.

Efficiency, modulation and stability: what the inverter really changes

The Multi F series operates with a modulation logic: the power adjusts as needed instead of starting at full capacity and then stopping. In practice, this offers several concrete advantages:

• more stable temperature, with fewer “peaks” of heat or coolness;

• smoother operation, often perceived as more comfortable;

• better match when some areas require little and others require more;

• reduction of unnecessary cycles, especially when room usage varies throughout the day.

This behavior is particularly valuable in Quebec, where the heat load can change rapidly: a mild day, a cold evening, a rising wind, prolonged cooking, guests, a patio door that's frequently opened. The heat pump must adapt to reality, not theory.

Quebec heating and climate: realistic expectations and sound decisions

For customers in Montreal, Laval, Longueuil, North Shore and South Shore , the question is never abstract: they want to know how the system behaves when winter sets in.

A well-designed multi-zone system generally provides:

• very comfortable heating for a large part of the season;

• better heat distribution in the targeted rooms;

• a measurable reduction in the need for supplemental electrical power in several scenarios.

However, performance depends on two key factors:

1. sizing by zone (actual loads, insulation, orientation, ceiling height, use);

2. the combination of indoor units (avoid extremes that unbalance the modulation).

At AirGreen, our approach is to size pragmatically: we aim for a stable experience, with a machine operating within its optimal range. A multi-zone system isn't a "BTU race." It's a system that must be coherent .

LogisVert subsidy: a lever to integrate from the design stage

The product information sheet indicates a provincial subsidy (LogisVert) of $1050 , with a dated update. In practice, the value of these assistance programs lies not only in the amount but also in the discipline they enforce. Strict adherence to criteria, reference numbers (including AHRI ), and installation compliance is essential.

At AirGreen, we integrate this aspect from the start: this avoids surprises, speeds up the process and ensures that the file is consistent with the chosen product and its multi-zone configuration.

Multi-zone installation: the AirGreen method that avoids service interruptions

Most problems attributed to multi-zone heat pumps don't originate from the machine itself. They stem from rushed design, improvised piping, or incomplete commissioning. A 4-zone system demands meticulous execution.

Zone design: the rule of “measured common sense”

Before even discussing location, we confirm:

• the volume of the rooms;

• sunshine (south/west very different from north/east);

• the “strategic” rooms (bedrooms, office, living room, basement);

• internal heat sources (kitchen, equipment, teleworking);

• air circulation constraints (closed doors, corridors, stairs).

A good multi-zone design avoids a common pitfall: creating an overly dominant "small zone" that forces the system to respond in a less comfortable way. The goal is to achieve a balanced demand throughout the day.

Choosing indoor units: comfort, noise, positioning

Multi-zone comfort is often gained or lost on small details:

• blowing direction to avoid direct spray onto the bed or sofa;

• installation height and clearances;

• access for filter maintenance;

• A position that limits the sensation of drafts.

The internal noise level also depends on the chosen model and the fan speed. Careful commissioning involves offering realistic settings: stability is often better than maximum airflow.

Plumbing and aesthetics: a multi-zone system must remain clean

In an urban environment, aesthetics are important. We prioritize:

• discreet routes along architectural lines;

• aligned and securely fixed line covers;

• supports that reduce vibrations;

• mechanical protection where there may be impacts (passage, courtyard, playing area).

The benefit is twofold: it's more beautiful and it's more durable.

Sealing, vacuum, charging: the three steps that protect the system

In a multi-zone environment, airtightness is non-negotiable. Our installation routine includes:

• rigorous leak tests;

• controlled vacuuming;

• stability validation before commissioning.

Next, the refrigerant charge and associated adjustments must correspond to the realities of the construction site: actual lengths, elevation changes, architecture, and final configuration. A multi-zone system works well when treated as a precise system, not as a "standard" installation.

Electricity and compliance: stability, safety, longevity

With a 220V power supply, parameters such as MCA and MOP guide the choices of protection and wiring. A coherent electrical installation directly contributes to:

• stability of operation;

• the reduction of unscheduled stops;

• protection of the compressor and components;

• global security.

We also keep accessibility in mind: a future service must be able to be done properly, without having to "undo" the house.

Drainage and defrosting: the duo that prevents winter problems

In Quebec, defrosting is a daily occurrence for a heat pump in heating mode. The key is to plan ahead:

• an outdoor location that manages drainage well;

• protection against ice buildup in sensitive areas;

• intelligent management of air releases.

In facilities where space is limited (narrow yards, close fences, neighbors), these details become essential to avoid misplaced ice and nuisances.

Common mistakes (and how to avoid them)

Error 1: “put 4 heads” without zone logic.
Consequence: inconsistent comfort, strange behavior, constant adjustments.
AirGreen approach: design by use, exposure and actual load.

Mistake 2: Oversizing to reassure oneself.
Consequence: cycles too short, sensation of draft, noise perceived.
AirGreen approach: balanced sizing, priority to stability.

Error 3: improvised piping layout.
Consequence: poor aesthetics, mechanical risks, difficult service.
AirGreen approach: route plan, supports, clean finishes, access maintained.

Error 4: “quick” commissioning.
The result: an unsatisfied customer despite a good machine.
AirGreen approach: tests, adjustments, simple explanations, clear instructions.

Typical scenarios where the LG MULTI F 4-Zone excels

Family home with teleworking facilities (Laval, North Shore)

• Comfortable office area from 9am to 5pm without encroaching on the living room area.

• Rooms are stable in the evening, with moderate ventilation.

• Easy adjustment depending on whether you are home.

Cottage with open concept and mezzanine (South Shore, Longueuil)

• Open area sized for occupancy and windows.

• A temperate mezzanine without overheating the ground floor.

• Reduction of temperature differences between levels.

Urban duplex with closed rooms (Montreal)

• Quiet rooms, simple settings.

• Living room/kitchen managed separately.

• More consistent comfort in summer, especially during heat waves.

Smart usage: settings that improve efficiency

A multi-zone system provides a great deal of control. When used correctly, it also improves efficiency. We generally recommend:

• stable guidelines rather than frequent variations;

• a “night comfort” priority in the rooms;

• reasonable schedules via WiFi, without extreme changes;

• suitable indoor ventilation (often lower = more comfortable, quieter).

The best strategy is one that reduces the need for daily intervention. A heat pump works best when it follows a predictable pattern.

Maintenance and monitoring: maintaining performance year after year

Even an excellent system loses efficiency if the filters are neglected or the flow is not monitored. Regular maintenance allows for:

• improved air quality and a more stable flow rate;

• less noise related to fouling;

• a more consistent performance;

• a reduction in avoidable service calls.

At AirGreen, we often see the difference between a maintained multi-zone and a neglected multi-zone: stability, noise, and consumption tell a different story.

Why choose AirGreen for your LG multi-zone heat pump

A 4-zone heat pump is an investment that deserves a top-notch installation. Our added value lies in:

• a structured multi-zone design (zones, loads, coherent combinations);

• a clean execution (piping, aesthetics, support, drainage);

• a complete commissioning (tests, balancing, explanations);

• clear support before, during and after.

We operate daily in Montreal , Laval , Longueuil , on the North Shore and the South Shore , and we adapt each project to local constraints: urban density, limited access, brick facade, close neighborhood, demanding winters and the need for stable comfort.