LG MULTI F R32 Dual Zone Heat Pump | 24000 BTU Compressor

Precise multi-zone comfort for typical buildings in Montreal, Laval, Longueuil, the North Shore and the South Shore

In the greater Montreal area, many residential dwellings don't behave like a uniform "cube": duplexes and triplexes with multiple floors, split-level houses , condos with glass facades , finished basements with higher humidity, less well-insulated rear additions, or closed bedrooms that quickly overheat in the summer. In this type of situation, a single-zone solution often forces compromises: one room is comfortable, another is too hot or too cold, and the thermostat needs constant adjustments.

The LG MULTI F R32 Dual Zone Heat Pump (outdoor unit KUMXB241A) addresses precisely this problem: providing a multi-zone base capable of supplying two zones (and up to three zones depending on the configuration) by modulating power rather than operating in an on/off fashion. The desired result is simple: stability , lasting comfort , and more logical energy management in two living spaces that don't require the same heating or cooling at the same time.

At AirGreen , we install these types of systems in Montreal (plexes, condos, townhouses) as well as in Laval , Longueuil , on the North Shore and the South Shore . The success of a multi-zone system depends not only on the compressor: it depends primarily on the selection of indoor units , the routing of refrigerant lines , condensate management , and rigorous commissioning.

What a dual-zone "Multi F" system actually represents

A multi-zone system is a platform: an outdoor inverter unit that distributes its capacity to two indoor units (wall-mounted, and sometimes other formats depending on compatibility). This allows:

• Two comfort temperatures adapted to the use (e.g. cooler bedrooms, more stable living space).

• Better consistency between rooms with different thermal loads (direct sunlight, humidity, air infiltration, kitchen).

• A gentler modulation, useful in mid-season: less aggressive restarts, more regularity.

In practice, this often results in a level of comfort that "goes unnoticed": no need to constantly adjust, fewer perceived variations, and more pleasant air conditioning when humidity rises.

Key data for the KUMXB241A model (which we systematically check)

Here are the technical points that really matter when moving from the product to the actual installation:

• Cooling capacity : 24,000 BTU (rated power).

• Gas (refrigerant) : R-32 .

• WiFi : included (depending on installed configuration and indoor unit(s) chosen).

• Zones : 2 zones (Double Zone) , with the possibility of planning an evolution to a maximum of 3 zones depending on the project.

• Outdoor noise level : approximately 54 dB(A) .

• Power supply : 220V .

• MCA : 17A ; MOP : 20A .

• Warranty (compressor – parts – labor) : 10-10-0 years (additional warranty available under certain conditions).

• AHRI : 214848483 .

• ENERGY STAR® : Yes ; Cold Climate : No.

• Advertised heating capacity : down to -16°C .

• Power at -8°C : 15,300 BTU ; Power at -15°C : 17,300 BTU .

• External dimensions (W x D x H) : 34.25 x 15.19 x 25.59 in .

• Interior dimensions (example shown) : 32.94 x 7.56 x 12.13 in (depending on interior model chosen).

• Indoor noise level : 29 / 38 dB(A) (depending on the indoor unit chosen and speed).

These figures help to avoid unpleasant surprises: actual capacity in cold weather, electrical requirements, choice of circuit breaker, outdoor location, neighborhood constraints, and acoustic comfort at night.

Choosing indoor units: the element that changes the feeling of comfort

Multi-zone systems are often purchased as "one compressor + two heads". In reality, it's the opposite: the indoor units determine the quality of comfort, air distribution, perceived noise, and long-term satisfaction.

For this model, several compatible indoor units can be used (e.g., KNUAK091A, KNUAK121A, NUAK181A, KNMAB071A, KNUAB091A, KNUAB121A, KNMAB151A, KNUAB181A ). A common mistake is to choose two identical capacities "by symmetry," without taking into account:

• orientation (morning sun vs. late afternoon sun),

• of the actual volume (higher ceilings, open area),

• of use (bedrooms at night, office during the day),

• of existing ventilation (hoods, fans, air exchanger),

• humidity (basement, proximity to the kitchen, infiltration).

At AirGreen, we start with a very practical approach: each zone receives an indoor unit that corresponds to its function. An open living space does not have the same needs as a bedroom: air diffusion, ventilation speed, and "silent" settings become key criteria.

Automatic shutters and air distribution: technical details, daily impact

The specifications indicate that vertical and horizontal louvers are controlled in Auto mode (depending on the indoor unit selected). In practice, this translates to:

• better air distribution in an uneven room,

• less direct draft on a sofa or bed,

• a gentler air conditioning sensation, especially at low speeds.

In bedrooms, this precision is often what makes the difference between "an air conditioner that can be heard" and "an air conditioner that you forget about".

AirGreen case study: two-story duplex with overheating bedrooms and a glass-enclosed living room

In a typical duplex (very common in Montreal ), the ground floor features an open-concept living area with large windows and a functional kitchen, while the upper floor contains smaller bedrooms, often more susceptible to temperature fluctuations. The owner wanted:

• reduce summer discomfort in bedrooms,

• stabilize the living room at the end of the day (sun + cooking),

• limit noise and keep the facade clean.

We designed the project with a dual-zone configuration: one indoor unit optimized for the open-plan area, the other for the upper floor. The determining factor was not the raw power, but the placement:

• The outdoor position was chosen to avoid resonance on the brick and minimize echo in a narrow courtyard.

• Route of refrigeration lines planned to preserve aesthetics (line covers aligned, clean passages).

• Drainage designed to prevent runoff onto walkways and reduce the risk of ice.

After commissioning, the most noticeable change was stability : fewer heat spikes upstairs and fewer fluctuations in the living room, even on humid days. In this type of building, that's exactly what a well-designed multi-zone system should deliver.

Heating and real limitations: understanding what "capacity -16°C" means

The product specifications indicate a heating capacity down to -16°C , and available power outputs at -8°C (15,300 BTU) and -15°C (17,300 BTU) . These figures are useful for setting expectations:

• During the mid-seasons and moderately cold periods, the system can provide very efficient and comfortable heating.

• When the temperature drops for an extended period, performance will depend on the building envelope, heat loss, and the distribution of zones.

• A multi-zone system offers excellent comfort, but the sizing must remain logical: the goal is real comfort, not a theoretical promise.

At AirGreen, we approach this subject without ambiguity: we size for the use , we explain the limits, and we propose realistic strategies (distribution of zones, settings, and, if necessary, supplement to existing heating).

Electricity, protection and compliance: MCA/MOP are not details

The model requires a 220V power supply, with a minimum circuit amperage (MCA) of 17A and a maximum protection current (MOP) of 20A . In practice, this means:

• a dedicated, compliant circuit

• a circuit breaker of the appropriate rating,

• a clean connection with an appropriate cable cross-section.

This aspect influences reliability and safety. A well-executed installation protects the equipment, simplifies future servicing, and prevents intermittent problems (outages, errors, instability).

AirGreen installation: on-site method, clean finishes, and measurable daily performance

A multi-zone system can look excellent on paper but be disappointing in practice if certain aspects are overlooked. Our approach is to treat the installation as a complete HVAC project: mechanical, refrigeration, electrical, condensate, acoustic, and commissioning.

Project stages (what we do in practice)

• Analysis of the two zones : volumes, orientation, insulation, occupancy habits.

• Selection of indoor units : power, acoustics, air diffusion, aesthetic constraints.

• Route planning : optimized refrigerated lines, limited drilling, discreet line cover.

• Condensate management : reliable drainage, protected evacuation, prevention of problematic flows.

• Electrical verification : dedicated circuit, protections, conformity, communication between units.

• Complete commissioning : testing, adjustments, validation of operation in cold/heating modes, usage advice.

Location of the outdoor unit: sound comfort and longevity

Perceived noise rarely depends solely on the dB(A) value. It also depends on the environment:

• brick wall that reflects sound

• narrow inner courtyard

• balcony, deck, or corner near a bedroom window,

• air circulation and free space around the unit.

We favour a location that limits reverberation, facilitates maintenance, and protects the unit from unnecessary accumulations (leaves, snow, dust).

WiFi and everyday use: real value, not a gimmick

When used intelligently, Wi-Fi helps maintain consistent comfort and minimizes manual adjustments. In homes where occupants alternate between being present and absent, simple management (stable settings, reasonable schedules, silent night modes) avoids intrusive reminders and improves the user experience.

We generally recommend:

• consistent guidelines across zones,

• a slight reduction at night rather than a large increase.

• the use of low ventilation mode for bedrooms.

Maintenance and best practices: maintaining efficiency and clean air

A high-performing multi-zone system must remain clean and well-ventilated. Our maintenance recommendations are simple and effective:

• Indoor unit filters : regular inspection, cleaning when necessary (frequency depends on dust, animals, renovations).

• Outdoor clearance : keep a clear area around the outdoor unit to preserve airflow.

• Drain monitoring : ensure that the drainage is not obstructed, especially in summer (high humidity).

• Prevention after work : after sanding, plastering, renovations, avoid operating the device without precautions (fine dust).

A clean system consumes less energy, makes less noise, and maintains a more stable temperature.

Common mistakes we avoid (and that you would benefit from knowing)

1. Oversizing for “safety” reasons : increases short cycles and can reduce dehumidification quality.

2. Poor choice of indoor units : inadequate air distribution, more noise at night.

3. Improvised route layouts : less clean finishes, risk of condensation, complicated maintenance.

4. Neglected drainage : troublesome runoff, traces, risk of ice in cold season.

5. Outdoor location chosen too hastily : sound reverberation, difficult access, more expensive maintenance.

LogisVert subsidy and performance information: secure your application

Your product page displays a Provincial Grant (LogisVert) of $765 (updated: November 26, 2025 ). The value of professional support here is to reduce errors.

• consistency of numbers and information (e.g. AHRI 214848483 ),

• photos and evidence at the right time

• Installation compliant and documented.

A clean and consistent file saves time and limits administrative returns.

Why this model is often a good solution for the Montreal region

This model stands out particularly in the following scenarios:

• Duplexes/multi-storey houses : two zones with different needs.

• Buildings with glazed rooms : high air conditioning load in the afternoon.

• Noise-sensitive rooms : possibility of targeting quieter and well-positioned indoor units.

• Open area + closed space : more logical management than an overused 1-zone.

With careful sizing and installation, the LG MULTI F R32 dual zone 24,000 BTU becomes a concrete solution: comfort, control, and ease of use.

Conclusion

For a dual-zone heat pump like the LG MULTI F R32 (KUMXB241A) , the final result depends as much on the product as on the installation: choice of indoor units, pipe routing, electrical compliance, drainage, and settings. At AirGreen , we offer a comprehensive, field-oriented approach, with a clear proposal and clean finishes.

Contact AirGreen for an on-site estimate, a multi-zone recommendation tailored to your two zones, and a detailed quote for Montreal , Laval , Longueuil , North Shore and South Shore .