Photo may vary slightly — verify by model number before ordering.LG KNSAC121B 12,000 BTU Mega 115V Wall-Mount Mini Split Indoor Unit, R32 (Pairs with KUSAC121B)
In stock and ordered before 1pm ET, Mon–Fri? It ships the same day from our US warehouse.
Not sure it's the right unit? Send the model and serial — help@totalhvacparts.com or 302-219-4994.
Need more than 2? Ask about factory lead time — we'll give you a real date, not a guess.
Min. order: 1 unit · Weight: 22.0 lb · Parcel
Overview
LG KNSAC121B is the 12,000 BTU indoor unit for LG's R32 Mega 115V single-zone wall-mount system. It pairs exclusively with the KUSAC121B outdoor unit to form the KSSAC121B system, rated 20 SEER2 / 12.3 EER2 / 9 HSPF2. It is the R32 successor to the R-410A LSN120HXV2.
Key figures from the LG submittal: net weight 19.2 lb, 459 CFM airflow on high, 2.75 pints/hour dehumidification, sound pressure as low as 21 dB(A). Refrigerant connections are 1/4 liquid and 3/8 vapor.
Features
- 24-Hour on/off timer
- Two-way (up / down) auto swing
- Auto changeover
- Auto restart
- Jet cool/Jet heat
- Smart Care
- Smart Diagnosis
- Built-in Wi-Fi via ThinQ™ app
- Energy saving
- Inverter (variable speed compressor)
- Self-cleaning indoor coil
- Sleep mode
- Ultra-quiet operation
What this indoor unit needs
- Outdoor unit: LG KUSAC121B (sold separately or as the KSSAC121B system). No other LG outdoor unit is an approved single-zone match for this head.
- Power: fed from the outdoor unit, 115 /60/1; interconnect wiring is field supplied per the installation manual.
- Line set: 1/4 × 3/8, 9.8 / 49.2 ft, up to 23 ft elevation difference.
- In the box: Wireless Remote Controller AKB76044207.
AHRI reference 214931172 (Energy Star, Energy Star Cold Climate); installation and warranty registration by an LG-trained licensed contractor — current terms are in the LG limited warranty document under Documentation.
Compatible Units
LG approves KNSAC121B only in the combinations below (per the LG engineering manual and submittal). Mixing it with any other outdoor or indoor unit is not an AHRI-rated match. Ask the parts desk if your existing equipment isn't listed.
- KUSAC121B (outdoor unit)
- KSSAC121B (system)
Specifications
Values in italic are not yet confirmed from OEM documentation. Ask us to verify before ordering.
Documentation
Companion Units & System Bundle
After You Order
Order number and confirmation by email the moment you check out.
Pulled from our shelf — the same live count you saw on this page. In-stock orders placed before 1pm ET, Mon–Fri, leave the same business day.
Tracking number lands in your inbox the moment it leaves the building.
Check the part number on the label against your order before installing. Wrong or damaged? Tell us — we'll sort it out.
Ask the Parts Desk
Not sure this fits? Need more than what's in stock? Send the model and serial from the unit's data plate — a real person reads it and confirms before you order.
Common Questions
What does the LG KNSAC121B pair with?
LG rates KNSAC121B only with KUSAC121B (outdoor unit) or KSSAC121B (system). Other combinations are not AHRI-matched and are not covered by the LG warranty.
What does the KNSAC121B replace?
KNSAC121B is LG's current R32 model in this position and replaces the discontinued LSN120HXV2. R32 and R-410A equipment cannot be mixed — replace the indoor and outdoor unit together.
What power does the KNSAC121B need?
115V, 1-phase. Minimum circuit ampacity and maximum overcurrent protection are listed in the Specifications table above and on the LG submittal under Documentation; size the breaker and wire to those values and local code.
Is the submittal sheet and installation manual available for KNSAC121B?
Yes — the LG submittal data sheet, engineering manual, installation manual and warranty document are all linked under Documentation on this page and can be downloaded without an account.
Is the stock number on this page real?
Yes — it's the live count from our own shelf, not an availability estimate. If it says 2, that's how many are physically here. When it hits zero, this page says so.
Is this a genuine LG unit, or aftermarket?
Genuine LG OEM equipment — not an aftermarket substitute.
I see this listed under a different name on other sites. Is it the same part?
Yes — manufacturers and distributors sometimes use different brand names or legacy labels for the same part number. Part number KNSAC121B is identical across all name variations.
What's the warranty on this part?
Warranty terms vary by manufacturer. Contact us with your order number for details specific to this part.
How fast does this ship?
In-stock items ship the same business day on orders placed before 1pm ET, Monday–Friday. Standard ground delivers to most of the continental US in 2–5 business days.
Does everything ship UPS or FedEx Ground?
Most orders ship UPS or FedEx Ground. A small number of large or heavy parts across the catalog ship by truck freight instead — that's still free, and we reach out to arrange a delivery window before those orders leave the warehouse.
