LG MULTI F R32 4-Zone Heat Pump | 30,000 BTU Compressor

Four zones, one outdoor unit: the most realistic way to balance a Greater Montreal home

In the daily life of a property in Montreal , Laval , Longueuil , on the North Shore or the South Shore , comfort is almost never uniform. A south-facing living room with large windows acts like a greenhouse in the afternoon. A bedroom above the garage retains its own character (often colder in winter, warmer in summer). A finished basement requires different humidity management. And, very often, the open-concept main floor "steals" airflow if the solution isn't considered room by room.

It is precisely in this context that the LG MULTI F R32 4-Zone Heat Pump | 30,000 BTU Compressor (outdoor unit KUMXB301A ) truly shines: a single outdoor unit, up to 4 indoor zones , and a comfort logic that genuinely adapts to how you live in your home. At AirGreen , we see this format as a precision solution: it doesn't replace all approaches, but it neatly addresses a very common problem here—buildings where a single setpoint simply doesn't work.

The true promise of a multi-zone, beyond the marketing

A successful multi-zone setup isn't just about "more control." It's primarily about:

• stable modulation (inverter technology) which avoids temperature fluctuations;

• an ability to handle very different rooms (sunlight, volumes, uses);

• an installation that minimizes losses, noise and irritants (drainage, vibrations, piping).

In other words: a multi-zone system doesn't just impress you the first week. It simplifies your life for years to come.

What the 30,000 BTU compressor can actually achieve in 4 zones

With a nominal cooling capacity of 30,000 BTU , this platform can power a variety of room and usage combinations. In practice, the result rarely depends on a single figure; it depends primarily on the distribution of the indoor units and sound thermal management.

• which room needs a continuous supply (office, bedroom);

• which room has peaks (kitchen/living room, glass room);

• which areas should remain quiet (bedrooms at night);

• which spaces are connected by openings (doors often open, central staircase, open area).

At AirGreen, we take the time to "read" the building: its layout, orientation, ceiling heights, and lifestyle. This is what transforms a "decent" multi-zone system into an exceptionally stable one .

Operating periods: useful when Quebec's mood changes within the same week

The KUMXB301A outdoor unit is designed to operate over a wide range, which really matters in our climate:

• In air conditioning , the operation can cover earlier/late periods in the season, and withstand very hot days.

• In heating , capacity becomes a comfort tool in mid-season and winter, especially if the zoning is logical and the building envelope is reasonable.

This point is important: a multi-zone system heats and cools better when it takes into account the building's actual characteristics. A single, oversized unit in a small room can lead to less comfortable cycles, whereas a more balanced zoning system makes it smoother, more stable, and often more pleasant to live in.

Technical data that matters for a proper installation (and not just for the product sheet)

R-32 refrigerant: modern performance, but no compromise on installation

R-32 is in line with current market choices. For the customer, the real issue isn't the name of the gas: it's the quality of the installation. A multi-zone system requires a disciplined installation.

• impeccable sealing (otherwise, performance and reliability suffer);

• rigorous vacuuming ;

• line insulation and mechanical protection;

• management of lengths and elevation changes.

This is precisely where the differences between entrepreneurs become visible.

Electricity: Avoid surprises at the panel

This unit operates on 208–230V . In practice, this implies checking the following:

• capacity available at the panel;

• wire gauge;

• adequate protection ( MOP up to 25A ; MCA around 19A );

• well-placed and accessible external disconnect switch.

In many homes in Montreal and Longueuil , we find electrical panels already heavily loaded (stove, pool heat pump, charging station, etc.). Planning ahead for electricity needs before installation helps avoid delays and unexpected costs.

Piping: the heart of a multi-zone

Multi-zone systems impose clear rules. The outdoor unit allows for multi-point connections:

• Liquid: 1/4 in x 4

• steam: 3/8 in x 4
  and limits that structure the project (minimum length per link, maximum length per link, maximum total length).

What this means on the ground:

• The "default" outdoor location is not chosen;

• we plan the passages (brick, soffit, exits);

• we protect the lines (line covers, fixings, UV protection);

• We avoid "unnecessary detours" which ultimately cost in performance and maintenance.

In a Plateau duplex with exterior stairs, or a split-level house on the North Shore , this point can make the difference between a silent system… and a system that is too often noticed.

Noise and comfort: a good multi-zone system is discreet

The outdoor unit displays a sound pressure level of around 51–54 dB(A) depending on the mode. On paper, this is a given; in real life, it's a parameter that dictates the location:

• proximity to windows;

• distance from the terrace;

• reflective surfaces (walls, fences);

• choice of supports (slab vs wall).

At AirGreen, we apply a simple principle: comfort also means silence . We prioritize robust, vibration-damping supports and installation methods that don't turn good equipment into a source of irritation.

Compatible indoor units: smart zoning is a strategy, not a list of models

This platform accommodates several indoor units (high-efficiency wall-mounted units). The choice is never arbitrary; it must reflect the specific characteristics of the rooms. Frequently used options include:

KNMAB071A – 7000 BTU

• Very good size for a small bedroom, office, secondary room.

• Typical airflows in multiple speeds: useful for gentle comfort.

• Interior noise level designed for quiet spaces.

KNUAB091A – 9000 BTU

• An excellent compromise for a master bedroom or medium-sized room.

• Allows you to maintain a stable temperature without feeling like a draft.

• Ideal when you want fine control, especially at night.

KNUAB181A – 18,000 BTU

• For living room, open area, large living space.

• Higher airflow rates (logical: more volume to treat).

• Important specification: the steam line can be larger (often 1/2 in on this format), which influences piping planning.

In all cases, the goal is to build a coherent whole: a large room receives a suitable format, and the bedrooms receive units that prioritize silence and stability.

Features that change the daily experience (when properly configured)

A modern multi-zone system is not limited to "heating/cooling". The truly useful functions are those that are correctly configured during initial setup:

• automatic vertical/horizontal sweep for better air distribution;

• night comfort modes (priority to silence and stability);

• Wi-Fi included , useful for tracking and adjusting zones;

• Automatic restart after power outage;

• programming logic that avoids temperature jumps.

At AirGreen, we emphasize one point: the best system is one that doesn't need constant adjustment. The goal is a setup that naturally integrates with your routine.

Real-world examples: why this format works so well in Montreal, Laval, and Longueuil

Scenario 1 — Plex and unequal floors: "the upper floor is uninhabitable in the summer"

In some duplexes/triplexes (Rosemont, Villeray, Verdun), the upper floor can overheat for weeks. Typical multi-zone zoning:

• 18,000 BTU for the most demanding living area;

• 9,000 BTU for the master bedroom;

• 7,000 BTU for an office;

• a fourth zone depending on the configuration (children's room, back room, etc.).

What makes it successful is not the number of zones: it's how they are placed and adjusted .

Scenario 2 — House on the South Shore: room above the garage

It's a classic situation in Boucherville, Saint-Lambert, and Longueuil: the room above the garage is "always different." A dedicated, well-sized, and properly configured area solves this problem without forcing the entire house to adapt.

Scenario 3 — Laval and open spaces: the kitchen dictates the temperature

A large open-plan area can mask a problem: the kitchen creates energy spikes (cooking, oven, guests), and the living room suffers the side effects. A stronger focus on the living area, combined with softer zones in the bedrooms, results in a more stable home—and often a more reasonable energy bill, because the entire building isn't being compressed at the same rate.

Common mistakes (and how we avoid them)

Here are the problems we most often see when taking over multi-zone installations:

1. Unbalanced zoning

   • Too much capacity in a small room, not enough in the living area.

   • Result: discomfort, cycling, wind noise.

2. Outdoor location chosen without any logic

   • Too close to a window, under a problematic eave, or in an area where snow accumulates.

   • Result: perceived noise, difficult access for maintenance, affected performance.

3. Neglected drainage

   • Incorrect slopes, poorly planned exits.

   • Result: drops, stains, frost, condensation return.

4. Finishes and line protection

   • Exposed lines, poorly protected insulation, weak fixings.

   • Result: rapid degradation, noise, compromised aesthetics.

At AirGreen, we treat multi-zone as a complete project: thermal, mechanical, acoustic, aesthetic.

What a customer notices after 30 to 60 days (when everything is done correctly)

The most tangible benefits that are frequently mentioned are:

• the house becomes predictable (less of a "roller coaster");

• Each occupant adjusts their zone without conflict;

• At night, the rooms remain comfortable without any harsh drafts;

• The system becomes unobtrusive: no constant adjustments, no surprises.

That's exactly what we're aiming for: a comfort that can be felt, but is not noticed.

AirGreen Method: transforming a technical specification into real, sustainable, and properly installed comfort

Choosing the LG MULTI F R32 4-Zone Heat Pump | 30,000 BTU Compressor means choosing a comfortable setup. But to achieve top-of-the-line results, the method is just as important as the equipment.

Our step-by-step approach

• On-site assessment : analysis of zones, volumes, sunlight, air circulation, facade and access constraints.

• Zoning plan : proposed head counts (7k/9k/18k) based on actual usage, not according to a simplified rule.

• Electrical validation : panel, protections, clean pathways.

• Installation and finishing : robust supports, vibration management, neat line coverings, material protection, clean work.

• Complete commissioning : testing, adjustments, shutter orientation, practical advice on use and programming.

Why choose AirGreen for this type of project?

Because a multi-zone system is a precision system. Our difference lies in the details:

• stability of the zones;

• cleanliness of passageways;

• noise risk reduction;

• durability of piping and finishes;

• support with adjustments (the first few weeks are crucial to optimize comfort).

Next Step

Are you considering a multi-zone heat pump for your property in Montreal , Laval , Longueuil , on the North Shore or South Shore ? Contact AirGreen for an on-site assessment and a clear proposal: zoning, models, installation, and a solution truly tailored to your building.