LG: 2x2 Cassette Type Ceiling Mounted | 9,000 BTU

A Discreet 2x2 Cassette for Heating and Cooling an Area Without a Visible Wall Unit

The LG 2x2 Cassette Ceiling Unit | 9,000 BTU addresses a very specific need we often encounter at AirGreen: providing a compact, quiet, and well-integrated HVAC solution when a wall-mounted unit is not ideal. In an office, clinic, meeting room, small business, condo with a suspended ceiling, or finished basement, wall space can sometimes be limited, already occupied by storage, display cases, windows, cabinets, or architectural features. The 2x2 cassette then allows comfort to be integrated directly into the ceiling, with four-way air distribution.

At AirGreen, we install heating, ventilation, and air conditioning systems in Greater Montreal, in Montreal, Laval, Longueuil, on the North Shore, the South Shore, and in Monteregie. This 9,000 BTU LG model is particularly interesting for projects requiring a discreet yet technically robust heat pump: a recessed indoor unit, a compact outdoor unit, operation with R-32 refrigerant, ENERGY STAR® certification, and heating capacity suitable for Quebec's climate realities when properly sized.

The technical data below aligns with the provided product sheet and the LG R32 engineering manual for four-way cassette systems.

A Solution Designed for Small, Well-Defined Areas

The LG KNUDB091A / KUSXB091A model is a 9,000 BTU single-zone air conditioning system, often used for a specific room or area rather than an entire building. It should not be chosen solely because it is compact: it must be matched to a real thermal load, calculated according to insulation, orientation, glazed surfaces, ceiling height, occupancy, and heat-emitting equipment.

In our installations, this type of cassette is often relevant for:

• a closed office in a commercial building in Montreal;
• a consultation room or small clinic in Longueuil;
• a workspace in a professional premises in Laval;
• a conference room with a suspended ceiling on the South Shore;
• a finished basement where a wall unit would be too visible;
• a reception area where direct air drafts on occupants are to be avoided;
• a condo or multi-unit space with ceiling access and aesthetic constraints.

The LG 2x2 cassette integrates into a suspended ceiling or a suitable structure. Its visible grille remains understated, while the indoor unit is mostly concealed. For clients who value the final appearance, this difference matters a lot: comfort is present, but the equipment does not occupy an entire wall.

Four-Way Diffusion: More Uniform Comfort Than a Simple Wall Jet

A wall-mounted unit projects air from a single point. A cassette like this one diffuses air in four directions, which allows for better temperature distribution in a square or slightly rectangular room. The stated airflow for the indoor unit is 300 / 265 / 230 CFM depending on the speed, which is consistent with a small, well-targeted area.

This type of diffusion is particularly useful when occupants are seated in the same place for extended periods. In an office, meeting room, or treatment room, poor positioning can create very real discomfort: cold air on the shoulders, drafts on a work table, or heat trapped near the ceiling. With a four-way cassette, we can adjust the air orientation to limit these irritants.

The indoor sound level is also a strong point of the model: 30 / 33 / 36 dB(A) depending on the speed. In practice, in a quiet room, this helps maintain a pleasant working atmosphere. However, the result depends on the installation, the acoustics of the room, the type of ceiling, the structure, the positioning of the grille, and filter maintenance.

Technical Specifications of the LG 2x2 Cassette Ceiling Unit 9,000 BTU

This product is associated with the following references:

• Indoor Model: KNUDB091A
• Outdoor Model: KUSXB091A
• System: KSUDB091A
• AHRI: 214826530
• Type: Single-zone four-way cassette heat pump
• Nominal Cooling Capacity: 9,000 BTU
• Cooling Capacity min. / nominal / max.: 3,400 ~ 9,000 ~ 9,900 BTU/h
• Heating Capacity min. / nominal / max.: 2,800 ~ 11,000 ~ 15,000 BTU/h
• SEER2: 22.20
• EER2: 13.90
• HSPF2: 10.00
• ENERGY STAR®: yes
• ENERGY STAR® Cold Climate: yes
• Refrigerant: R-32
• Dehumidification: 1.5 pt/h
• Voltage: 208-230 V / 60 Hz / 1 phase
• MCA: 13.4 A
• MOP: 15 A
• Refrigerant Piping: 1/4 in liquid, 3/8 in gas
• Minimum / Maximum Piping Length: 16.4 ft / 65.6 ft
• Length without refrigerant added: 24.6 ft
• Maximum Elevation Difference: 49.2 ft
• Stated Warranty: 10 years compressor, 10 years parts, 0 years labor
• Additional Warranty: possible depending on applicable offer

For the indoor unit, net dimensions are approximately 22-7/16 x 8-7/16 x 22-7/16 inches. The associated grille is model PT-QAGW0, with dimensions of approximately 24-13/32 x 1-3/8 x 24-13/32 inches. The outdoor unit remains compact, with net dimensions of approximately 30-5/16 x 21-15/32 x 11-11/32 inches, which facilitates its integration on a technical terrace, a wall mount, a ground base, or an outdoor area compliant with required clearances.

Heating Performance: What the Figures Mean in Quebec

The climate of Montreal, Laval, Longueuil, the North Shore, and the South Shore necessitates serious thought about heating. A heat pump should not be chosen solely based on its nominal cooling BTU. Its low-temperature performance, available capacity, and the room's needs must be considered.

For this LG model, the data notably indicates:

• maximum heating capacity at 17 °F: 11,600 BTU/h;
• maximum heating capacity at 5 °F: 10,400 BTU/h;
• maximum heating capacity at -4 °F: 9,300 BTU/h;
• outdoor unit heating operating range: down to -4 °F, or about -20 °C.

This does not mean that every 9,000 BTU room will be perfectly heated in all conditions. In a glazed room, a corner office, a room above a garage, a poorly insulated ground floor, or a space with air infiltration, the heating load may exceed what the equipment can comfortably provide. This is precisely why AirGreen evaluates the area before recommending the product.

In a well-insulated small interior office, this cassette can offer excellent comfort. In a commercial space with a frequently opening door to the outside, a different capacity or auxiliary heating may sometimes be necessary. Our role is to make this distinction before installation, not after.

R-32, Efficiency, and Environmental Responsibility

The system uses R-32 refrigerant, a new generation gas increasingly used in residential and commercial HVAC equipment. Compared to older refrigerants, R-32 offers a better environmental profile, notably with zero ozone depletion potential and a lower global warming potential than R-410A.

In the field, this also demands rigorous professional practices. R-32 is classified as slightly flammable; it must be handled by qualified technicians, with appropriate procedures, tools, and controls. The LG cassette integrates a refrigerant leak detector, an important feature for this type of recessed equipment. At AirGreen, our refrigeration technicians follow structured work methods for brazing, vacuum pulling, leak testing, commissioning, and installation documentation.

HVAC Installation: The Details That Make a Difference

Installing a 2x2 ceiling cassette is more demanding than a simple wall unit. The final appearance is often cleaner, but the work behind the ceiling must be meticulously planned.

Before proposing this model, we particularly check for:

• the presence of a suspended ceiling or sufficient space to recess the unit;
• the structure capable of supporting the unit at all four corners;
• access for future maintenance of the filter, drain, and components;
• the possible passage of the refrigerant piping;
• the path of the condensation line;
• the position of the outdoor unit;
• electrical compliance with a 208-230 V power supply;
• the distance between the indoor and outdoor units;
• the outdoor sound level according to the neighborhood;
• protection of the outdoor unit against snow, ice, and accumulation.

The indoor unit is equipped with a condensate pump capable of a maximum lift of approximately 27-9/16 inches from the bottom surface of the unit. This feature is very helpful when direct gravity drainage is difficult, but it does not replace proper drainage line design. A poorly thought-out slope, an improperly insulated pipe, or an outlet exposed to freezing can cause avoidable service calls.

A Concrete Example: When the Cassette Avoids an Aesthetic Compromise

In several commercial projects in Longueuil and on the South Shore, we encountered the same problem: the client wanted to air condition a small workspace, but no wall was suitable for a wall unit. One wall was glazed, another had cabinets, a third was used for display, and the last was too close to the occupants. The 2x2 cassette then becomes a logical solution because it frees up wall space and distributes air from the ceiling.

In a closed office with a suspended ceiling, installing a centered cassette often provides more stable comfort, provided the grille is not placed directly above a fixed workstation. During our technical visits, we frequently adjust the proposed location by a few inches or feet to avoid a table, a reception chair, or a counter. This type of detail seems minor on paper, but it changes the daily experience.

Another frequent case in Laval concerns renovated basements. Some owners do not want to add a visible wall unit in a family room or home office. When the ceiling offers the necessary access, the cassette allows for a more integrated finish. However, we always insist on accessibility: a beautiful installation that becomes difficult to maintain is not a good installation.

Mistakes to Avoid Before Buying a 9,000 BTU Cassette

A high-performance product does not compensate for poor selection. Here are the most common mistakes we correct during AirGreen consultations:

Choosing 9,000 BTU without a load calculation.
A room of the same area can have very different needs depending on its sun exposure, insulation, windows, and use.

Installing the cassette too close to an occupant.
Even with four-way diffusion, poor placement can create a draft sensation.

Forgetting the condensate drain.
The integrated pump helps, but the line must be clean, insulated as needed, and accessible.

Assuming WiFi is included.
On this model, WiFi is optional with the compatible module. We specify this before submission to avoid any confusion.

Neglecting the outdoor unit.
The small size of the outdoor unit does not mean it can be installed anywhere. Clearances, noise, defrost water drainage, snow, and service access must be respected.

Ignoring piping length.
This model accepts a maximum equivalent length of 65.6 ft. The longer the piping, the more attention must be paid to refrigerant charge, insulation, and performance.

HVAC Maintenance: Simple, but Essential

The long-life washable filter of the 2x2 cassette measures approximately 14 x 14 x 1 inches. It must be cleaned regularly, especially in offices, businesses, and premises where dust accumulates quickly. A clogged filter reduces airflow, increases noise, decreases efficiency, and can lead to condensation problems.

At AirGreen, we recommend preventive maintenance that includes:

• filter cleaning;
• inspection of the grille and fins;
• condensate pump check;
• drain line cleaning;
• visual inspection of refrigeration connections;
• operation control in air conditioning and heating;
• checking error codes and unit behavior;
• inspection of the outdoor unit, especially after winter.

For businesses and offices, HVAC maintenance is often more important than in a residence, as the equipment operates longer and in a more demanding environment. A poorly maintained cassette can develop odors, water leaks, reduced performance, or abnormal noise. Planned maintenance generally costs less than an urgent service call during a heatwave.

Subsidies, Eligibility, and Product Reality

The provided sheet indicates a LogisVert provincial subsidy of $0, with an update dated November 26, 2025. As programs can vary depending on periods, criteria, and models, we always verify eligibility before finalizing a submission. For some customers, choosing an ENERGY STAR® Cold Climate certified product remains relevant even without direct subsidy, as seasonal efficiency, installation quality, and durability have a real impact on operating costs.

Why this LG cassette is interesting for Montreal, Laval, Longueuil, the North Shore, and the South Shore

The LG 2x2 Cassette Type Ceiling Unit | 9,000 BTU is well suited for projects where priorities are clear: discrete integration, localized comfort, good efficiency, low noise level, and careful installation. It is not the product to recommend for all situations, but when it fits the right context, it offers an elegant and effective solution.

Its main advantages are:

• a discreet appearance thanks to ceiling recessing;
• four-way air distribution;
• silent operation at low speed;
• useful heating capacity down to approximately -20 °C;
• ENERGY STAR® Cold Climate certification;
• R-32 refrigerant;
• a compact outdoor unit;
• a good option for offices, businesses, condos, and finished basements;
• WiFi compatibility with accessory;
• a design adapted for suspended ceilings.

Why entrust AirGreen with the installation

At AirGreen, we don't just sell an appliance. We install a complete HVAC solution that must function correctly in a real building, with its constraints, occupants, ceilings, electricity, drainage, neighborhood, and comfort expectations.

Our refrigeration technicians take the time to validate technical details before starting work. We prepare a clear final offer before beginning, to avoid surprises. We are active in Montreal, Laval, Longueuil, on the North Shore, the South Shore, and in Montérégie, with an approach adapted to both residential projects and commercial and multi-unit installations. AirGreen also holds $5M in liability insurance, an important element for clients who want a serious installation from start to finish.

For a cassette like this, the installer's experience matters greatly. The choice of location, unit support, drain, sealing, line length, refrigerant charge, wiring, commissioning, and final tests all have a direct influence on comfort. A well-planned installation makes the equipment quieter, more stable, and easier to maintain.

Request an AirGreen Quote

Are you considering installing the LG 2x2 Cassette Type Ceiling Unit | 9,000 BTU in an office, business, condo, basement, or specific area of your building? Contact AirGreen for a clear evaluation, a suitable recommendation, and a transparent quote for your LG cassette heat pump project in Montreal, Laval, Longueuil, on the North Shore, or the South Shore.