The maker's photo for this series, not this exact size; the outdoor unit grows with capacity

LG · Single-Zone

LG Art Cool Deluxe LGRED 12,000 BTU

KNSAL121A / KUSAL121A (system KSSAL121A)

~$2,162approximate retailer price at last check, equipment only

BTU/h: 12k
Volts: 230
Zones: 1
SEER2: 25.5
HSPF2: 11.2
Heats to: -31°F
Refrig.: R-32
Covers: 550 ft²
Wi-Fi: Built in

Best forCold-climate homes that want a cold-weather 12k from a mainstream maker without paying Mitsubishi prices.

Overview

The 12k LGRED is the size most owners ask about. It is the KSSAL121A system: Art Cool Deluxe indoor unit and a KUSAL121A outdoor unit with LG's cold-climate package, rated 25.5 SEER2, 11.2 HSPF2 and 13.8 EER2 under AHRI certificate 216368960. Heating capacity is 13,000 BTU at the rating point and LG lists operation down to -31°F. At about $2,162 for the system it undercuts Mitsubishi's MSZ-FX12NL by about a thousand dollars on equipment. The indoor unit is as quiet as 21 dB. The tradeoff is a lower HSPF2 than the Mitsubishi; in the cold it does well, with NEEP listing 14,700 BTU/h at 5°F, more than its 13,000 BTU rating at 47°F.

About $1,000 under Mitsubishi FX12
14,700 BTU at 5°F (NEEP)
Indoor unit as quiet as 21 dB

Cold-weather output

At 5°F it makes more heat than its 47°F rating (113%), according to the certified NEEP listing for this pairing. LG rates it to keep running down to -31°F.

COP at 5°F: 2.05
Refrigerant: R-32
AHRI cert.: 216368960
ENERGY STAR cold climate: Yes

Pairing: KUSAL121A with KNSAL121A. Checked October 8, 2026 on NEEP's ccASHP list; a different head or condenser posts different numbers.

Strengths and catches

Strengths

+25.5 SEER2 / 11.2 HSPF2 under AHRI 216368960
+Operating range listed down to -31°F
+Indoor unit as low as 21 dB
+$2,162 is well under the Mitsubishi FX12 and Daikin Aurora 12k
+Wi-Fi ready via LG ThinQ

Catches

−Warranty depends on licensed install plus 60-day registration
−Line set sold separately
−11.2 HSPF2 trails the Mitsubishi FX12's 12.4

Questions buyers ask

How much room will the 12k LGRED handle?+

LG lists it for about 550 sq ft. NEEP certifies 13,000 BTU at 47°F, enough for a large bedroom, a living room or a studio in a well-insulated home. Leaky older rooms may want a bigger unit.

What does it deliver at 5°F?+

NEEP certifies 14,700 BTU at 5°F with a COP of 2.05, which is more than its 47°F rating. LG states operation down to -31°F. It is ENERGY STAR cold climate listed.

How does it compare with the Mitsubishi FX12 and the cheaper LG lines?+

At $2,162 it undercuts the Mitsubishi MSZ-FX12NL by about a thousand dollars on equipment, though its 11.2 HSPF2 sits below Mitsubishi's. Against the LG High Efficiency 12k at $1,980, it costs about $180 more and adds heating to -31°F instead of -4°F.

What do I need to keep the 10-year warranty?+

A licensed installer and registration within 60 days of installation. The indoor unit alone is listed at 10-year compressor and 7-year parts. The line set is sold separately.