How loud is the LG Artcool Mirror AC12BK.NSJ / AC12BK.UA3?

19 dB(A) indoors, quieter than a whisper.

How energy-efficient is the LG Artcool Mirror AC12BK.NSJ / AC12BK.UA3?

Its efficiency rating is SEER 6.6.

What size room does the LG Artcool Mirror AC12BK.NSJ / AC12BK.UA3 cool?

It is rated to cool a room 25–35 m² (3.5 kW · 12,000 BTU).

Do I need a professional to install the LG Artcool Mirror AC12BK.NSJ / AC12BK.UA3?

Yes. As a single split it needs a certified installer. Usually needs permission.

Does the LG Artcool Mirror AC12BK.NSJ / AC12BK.UA3 heat as well as cool?

Yes. It also heats, rated 4 kW.

Single splitA++ Heats too

Artcool Mirror AC12BK.NSJ / AC12BK.UA3

Name: LG Artcool Mirror AC12BK.NSJ / AC12BK.UA3
Brand: LG

LG's style statement: a mirror-fronted Dual Inverter unit with UVnano cleaning and smart control. Looks great and runs quietly, though efficiency is mid-tier.

€1,150

List price

indoor + outdoor unit, install extra

No live retailer link for this model right now.

Performance

Cooling capacity: 3.5 kW · 12,000 BTU
Heating capacity: 4 kW
Room coverage: 25–35 m²
SEER (cooling): 6.6
SCOP (heating): 4
Energy class (cooling): A++
Energy class (heating): A+
Annual energy (cooling): 186 kWh

Noise, size & features

Model number: AC12BK.NSJ / AC12BK.UA3
Indoor noise

What is good

Distinctive mirror-finish front panel
Dual Inverter compressor with quiet 19 dB(A) low mode
UVnano and Plasmaster Ionizer air cleaning
Built-in Wi-Fi with LG ThinQ

What to watch

A++ / A+ efficiency, behind the premium A+++ models
Higher running cost than top-tier units
Glossy panel shows dust and fingerprints

Installation & the rules that apply

This is a single split. This is where regulation bites. Breaking into the refrigerant circuit must be done by an F-gas certified installer (in the EU and UK), and single-split systems may use refrigerant indefinitely only if its GWP is under 750 (R32 qualifies). DIY voids the warranty, home insurance and is an offence. The outdoor unit alters the facade, so a prior declaration to the town hall (e.g. France), planning permission, or freeholder, landlord and condominium consent is commonly needed, plus heritage rules in protected zones and minimum-distance and noise rules toward neighbours.

Installation

Certified installer

Refrigerant

R32

BelgiumCopropriete authorisation for shared partsReviewed June 2026Often blocks install

Common questions about the LG Artcool Mirror AC12BK.NSJ / AC12BK.UA3

How loud is the LG Artcool Mirror AC12BK.NSJ / AC12BK.UA3?: 19 dB(A) indoors, quieter than a whisper.
How energy-efficient is the LG Artcool Mirror AC12BK.NSJ / AC12BK.UA3?: Its efficiency rating is SEER 6.6.
What size room does the LG Artcool Mirror AC12BK.NSJ / AC12BK.UA3 cool?: It is rated to cool a room 25–35 m² (3.5 kW · 12,000 BTU).
Do I need a professional to install the LG Artcool Mirror AC12BK.NSJ / AC12BK.UA3?: Yes. As a single split it needs a certified installer. Usually needs permission.
Does the LG Artcool Mirror AC12BK.NSJ / AC12BK.UA3 heat as well as cool?: Yes. It also heats, rated 4 kW.

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