Photo may vary slightly — verify by model number before ordering.LG KSSLB121A 12,000 BTU High Efficiency Multi-Position Air Handler Single-Zone Heat Pump System, R32, 17.00 SEER2 (KNSLB121A + KUSXB121A)
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 4? Ask about factory lead time — we'll give you a real date, not a guess.
Min. order: 1 unit · Weight: 283.1 lb · Truck Freight
Overview
LG KSSLB121A is the complete 12,000 BTU (1 Ton) R32 single-zone multi-position air handler heat pump system from LG's High Efficiency Multi-Position Air Handler line: the KNSLB121A indoor unit and the KUSXB121A inverter outdoor unit, sold together as the matched, AHRI-rated pair. It is rated 17.00 SEER2, 13.30 EER2, 9.80 HSPF2, runs on 208-230/60/1 power (19.1 A MCA / 30 A MOP).
Capacity modulates across 5,000 / 12,500 / 17,500 Btu/h in cooling and 6,000 / 15,000 / 19,500 Btu/h in heating (min / rated / max), so the system idles at part load instead of cycling. Heating continues down to -13°F outdoor, with 16,300 Btu/h available at 17°F and 15,000 Btu/h at 5°F. The indoor unit runs as low as 28 dB(A); the outdoor unit is 51 dB(A) in cooling.
What's in the bundle
- 1 × LG KNSLB121A 12,000 BTU multi-position air handler indoor unit
- 1 × LG KUSXB121A R32 inverter heat pump outdoor unit
What you still need
- 1/4 × 3/8 line set, 16.4 / 164 ft
- Interconnect cable, disconnect and breaker sized to the MCA/MOP in the specifications; pad or wall bracket; condensate drain
Typical coverage is roughly 450–550 sq ft depending on climate, insulation and layout. AHRI reference 217284945. Installation and warranty registration should be completed by a licensed contractor who has completed LG training; the LG limited warranty document is linked under Documentation.
What's Included
This system ships as the LG-matched pair below. Each component is also sold separately — see Companion Units further down.
- Includes KNSLB121A indoor unit
- Includes KUSXB121A outdoor unit
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 is included with the KSSLB121A system?
KSSLB121A ships as Includes KNSLB121A indoor unit and Includes KUSXB121A outdoor unit. Line set, interconnect wiring, disconnect, pad or bracket and condensate drain are field supplied.
What power does the KSSLB121A need?
208-230V, 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 KSSLB121A?
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 4, 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 KSSLB121A 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. This part ships by LTL freight, so transit runs on the freight schedule — we'll contact you to arrange delivery.
Does everything ship UPS or FedEx Ground?
This part ships by truck freight rather than parcel — still free, included in the price shown, and we'll contact you to schedule delivery before it ships.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.
