LG / 4-Way Ceiling Cassette R-32
LG 4-Way Ceiling Cassette 11.1k Four-Way Cassette R-32 208/230V Mini-Split
The 4-Way Ceiling Cassette R-32 12k pairs KNUDB121A with KUSXB121A for a professional 4-way ceiling cassette installation instead of a wall-mounted head. It certifies at 11,100 BTU cooling and 14,000 BTU heating at 47F, with 21.5 SEER2, 13 EER2, and 10.1 HSPF2.
Its certified 5F output is 10,700 BTU, above the 17F rating, so it has real low-temperature heat to size against. The catch is ceiling execution: panel clearance, condensate routing, and service access have to be right before the cassette looks clean.
Refrigerant generation
R-32 - current-generation refrigerant
This system's warranty depends on licensed installation — get quotes from installers in your area.
Get installation quotes- Last sourced
- Aug 5, 2026
SplitAtlas score
8.1 / 10
(21.5 SEER2) among 12k systems
(10.1 HSPF2) among 12k systems
(76.4% heat retained at 5F; -4 F heating floor) among 12k systems
(10 yr parts / 10 yr compressor) across the catalogue
(3 verified features) across the catalogue
(3 manuals; spec sheet) across the catalogue
Not evaluated
- Installation accessibility — not applicable (professional install)N/A
professional install - DIY-accessibility not applicable
- Price-to-value — not evaluatedN/A
This is a professionally installed, quote-only system, so we can't score its price. Get an installed quote to compare real cost.
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Key ratings
Best-fit use cases
Best for open rooms, offices, and ceiling-grid spaces where four-way ceiling distribution is worth the panel and condensate work around 400-600 sq ft, where LG dealer installation and the alternate indoor form are worth more than the simplicity of a wall-mounted head.
Buyer review snapshot
Install difficulty
- Electrical: 208/230V; MCA 9 A; breaker/fuse 15 A.
- Line set: connection type not sourced; max 65.6 ft.
Alternatives
- Daikin ATMOSPHERA 12,000 BTU R-32 208/230V (FTXM12WVJU9 / RXM12WVJU9)
9.0 score / 12k / SEER2 25.2 / -13 F heating floor / 208/230V
Exact destination at HVACDirect: $2,848.00, checked Jul 23, 2026
- Blueridge XS6 Max Efficiency 12,000 BTU R-454B 208/230V (BXS6A12WM0 / BXS6A12UC0)
8.9 score / 12k / SEER2 29.4 / -22 F heating floor / 230V
Exact destination at Alpine Home Air: $1,979.00, checked Jul 24, 2026
- Senville ELITE 12,000 BTU R-454B 208/230V (SENE-12EL-IHH / SENE-12EL-OH)
8.9 score / 12k / SEER2 29.4 / -22 F heating floor / 187-253V
Exact destination at Senville: $1,699.99, checked Jul 24, 2026
Availability and price context
We could not verify a current retail price for this model. We could not find this exact model in stock at a retailer we work with when we last checked on 2026-08-05.
Purchase channel policy
LG allows the online-purchase path only when the online source is expressly authorized by LG; an online purchase from a non-authorized source voids the limited warranty.
- Warranty impact
- The limited warranty is void and LG has no liability when the system is purchased online from a source not expressly authorized by LG.
- Installation condition
- The online source must be expressly authorized by LG; the system must also satisfy LG's qualified-system installation terms.
- Authorized channel
- Expressly authorized LG source with qualified installation by a trained, licensed HVAC contractor under LG warranty terms.
Buying online can keep warranty coverage only when the seller is expressly authorized by LG; confirm that status and the qualified installation path before purchase.
Compare online-purchase warranty rules by brand
Source: LG Electronics U.S.A., Inc.: LG R32 Residential / Light Commercial Systems Warranty Card; retrieved Aug 15, 2026.
Source date
- Model data sourced
- Aug 5, 2026
- Page reviewed
- Aug 5, 2026
- Source-backed records
- 5
- Newest source retrieved
- Aug 5, 2026
Warranty tiers
Warranty: 5 years parts and 7 years compressor as standard; 10 years parts and compressor if qualified registered installation.
Model context
- LG dealer channel
- LG alternate-form equipment here is professional-install; exact-pair retail offers only appear when we can verify the retailer destination.
- Install path
- This is professional-install equipment; no verified current retail offer is attached. Brand purchase-channel policy is shown in the buyer review snapshot.
Strengths
- 11,100 BTU of 4-way ceiling cassette cooling capacity on current R-32 refrigerant.
- 21.5 SEER2 / 13 EER2 / 10.1 HSPF2 certified efficiency.
- 8,700 BTU at 17F and 10,700 BTU at 5F give concrete winter numbers for sizing.
Weaknesses
- The catch is ceiling execution: panel clearance, condensate routing, and service access have to be right before the cassette looks clean.
- Ceiling cassettes need a workable ceiling cavity, drain route, and service clearance, so they are not a drop-in wall-head substitute.
Climate suitability
- Minimum heating ambient
- -4 F[1]
- Rated heating at 5F
- 10,700 BTU/h[3]
- Rated heating at 17F
- 8,700 BTU/h[3]
- Rated heating at 47F
- 14,000 BTU/h[3]
Specifications
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- Manufacturer
- LG
- Brand
- LG
- Product line
- 4-Way Ceiling Cassette R-32
- Model number
- KNUDB121A indoor / KUSXB121A outdoor
- Indoor unit model
- KNUDB121A
- Outdoor unit model
- KUSXB121A
- Number of zones
- 1
- Max indoor units
- not published
- Rated cooling capacity
- 11,100 BTU/h[3]
- Rated heating capacity
- 14,000 BTU/h[3]
- Voltage
- 208/230V[1]
- MCA
- 9 A[1]
- Maximum fuse or breaker size
- 15 A[1]
- Breaker needed
- not published
- SEER2
- 21.5 SEER2[3]
- EER2
- 13 EER2[3]
- HSPF2 (Region 4)
- 10.1 HSPF2[3]
- HSPF2 (Region 5)
- not published
- COP
- not published
- COP at 47F
- not published
- COP at 5F
- 2.16 COP[3]
- Minimum outdoor heating temperature
- -4 F[1]
- Minimum outdoor cooling temperature
- 5 F[1]
- Maximum outdoor temperature
- 118 F[1]
- Indoor noise range
- not published
- Outdoor noise rating
- not published
- Indoor weight
- not published
- Outdoor weight
- not published
- Refrigerant
- R-32[3]
- Refrigerant charge
- not published
- Manufacturer coverage
- not published
- Line-set size
- 1/4" O.D. liquid / 3/8" O.D. suction
- Included line-set length
- LG cassette and ducted submittals publish piping limits; the installing contractor supplies the refrigerant line set.
- Maximum line-set length
- 65.6 ft[1]
- Max line set per indoor
- not published
- Maximum elevation difference
- 49.2 ft[1]
- Max height between indoor units
- not published
- Wi-Fi support
- supported[2]
- Energy Star status
- ENERGY STAR certified[4]
- AHRI certification number
- 214826533[3]
- Warranty
- Standard: 5 yr parts / 7 yr compressor (standard coverage); Best case: 10 yr parts / 10 yr compressor (qualified registered installation). Standard 5-year parts and 7-year compressor coverage; qualified registered installations extend to 10 years total parts and compressor coverage.
- Install path
- Professional install
- Retail price
- We could not find this exact model in stock at a retailer we work with when we last checked on 2026-08-05.
- Available retailers
- not published
- Manual links
- AHRI Active public directory row 214826533, LG ProductSearch record for KSUDB121A, LG 4-Way Ceiling Cassette R-32 submittal - KSUDB121A
- Specification sheet
- LG 4-Way Ceiling Cassette R-32 submittal - KSUDB121A
- Last sourced date
- Aug 5, 2026
Electrical requirements
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Installation considerations
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- Liquid line
- 1/4" O.D.[1]
- Suction line
- 3/8" O.D.[1]
- Line connection type
- not published
- Precharged length
- not published
- Included line-set length
- LG cassette and ducted submittals publish piping limits; the installing contractor supplies the refrigerant line set.
- Maximum line-set length
- 65.6 ft[1]
- Max line set per indoor
- not published
- Max height between indoor units
- not published
- Indoor dimensions
- not published
- Outdoor dimensions
- not published
- Indoor weight
- not published
- Outdoor weight
- not published
- Drain size
- not published
Related systems and guides
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- Mitsubishi Electric comparison model
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- LG Mega R-32 11k 230V
- Guide library
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- LG mini split review: is LG any good?
- The best DIY mini splits of 2026
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- Line sets
- Line-set covers
Frequently asked questions
- Can I install the LG 4-Way Ceiling Cassette 11,100 BTU R-32 208/230V (KSUDB121A) myself, or do I need a pro?
- LG 4-Way Ceiling Cassette 11,100 BTU R-32 208/230V (KSUDB121A) is built for professional installation: the line set must be flared, evacuated, and charged, which requires EPA-certified refrigerant handling. Installing it outside the manufacturer's requirements can void the warranty, so budget for a qualified HVAC installer.
- Will the LG 4-Way Ceiling Cassette 11,100 BTU R-32 208/230V (KSUDB121A) keep heating in a cold winter?
- The manufacturer publishes 10,700 BTU/h of heating output at 5F. Rated heating operation extends down to -4 F. Certified heating efficiency is 10.1 HSPF2. Match those numbers against your climate's design temperature - in cold regions, output at 5F matters far more than the nameplate capacity measured at 47F.
- What electrical circuit does the LG 4-Way Ceiling Cassette 11,100 BTU R-32 208/230V (KSUDB121A) need?
- Published electrical requirements: 208/230V voltage, 9 A minimum circuit ampacity, and 15 A maximum breaker or fuse sizing. Confirm the final circuit against the unit nameplate and local code with a licensed electrician.
- How far can the outdoor unit be from the indoor head?
- The published maximum line-set length is 65.6 ft. Longer runs than the included set allows typically mean added refrigerant and a pro visit, so measure the planned routing before ordering.
- What warranty does the LG 4-Way Ceiling Cassette 11,100 BTU R-32 208/230V (KSUDB121A) carry?
- The manufacturer publishes these warranty tiers: Standard: 5 yr parts / 7 yr compressor (standard coverage); Best case: 10 yr parts / 10 yr compressor (qualified registered installation). Registration requirements and proof of qualified installation commonly affect coverage, so read the warranty terms before install day.
Data sources
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- LG Electronics U.S.A., Inc.: LG 4-Way Ceiling Cassette R-32 submittal KSUDB121ASourced - manufacturer technical document
Covers Frequency, Maximum breaker size, Maximum fuse size, Minimum circuit ampacity, Phase, Voltage range and more
- LG Electronics U.S.A., Inc.: LG ProductSearch 1-Way Ceiling Cassette recordSourced - manufacturer product page
Covers Wi-Fi support
- Air-Conditioning, Heating, and Refrigeration Institute: AHRI Active LG R-32 form-factor row 216778956Sourced - AHRI directory
Covers AHRI certification number, Rated cooling capacity, COP at 5F, EER2, Rated heating capacity, HSPF2 (Region 4) and more
- ENERGY STAR: ENERGY STAR exact mini-split row 216778956Sourced - Energy Star listing
Covers Energy Star status
- LG Electronics U.S.A., Inc.: LG R32 Residential / Light Commercial Systems Warranty CardSourced - manufacturer technical document
Covers Best-case compressor warranty, Best-case warranty conditions, Best-case parts warranty, Legacy compressor warranty value, Legacy warranty value, Standard compressor warranty and more
Last updated
Aug 5, 2026