How loud is the LG MU3R19 (Multi F, 3-room outdoor unit)?

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

How energy-efficient is the LG MU3R19 (Multi F, 3-room outdoor unit)?

Its efficiency rating is SEER 8.6.

Do I need a professional to install the LG MU3R19 (Multi F, 3-room outdoor unit)?

Yes. As a multi-split it needs a certified installer. Usually needs permission.

Does the LG MU3R19 (Multi F, 3-room outdoor unit) heat as well as cool?

Yes. It also heats, rated 6.3 kW.

Multi-splitA+++ Heats too

LG · Model MU3R19.U23

MU3R19 (Multi F, 3-room outdoor unit)

Name: LG MU3R19 (Multi F, 3-room outdoor unit)
Brand: LG

LG's compact three-port Multi F outdoor unit reaches the top A+++ cooling class, running up to three indoor units efficiently across a smaller flat or house.

€1,300

List price

outdoor unit only; indoor units and install extra

No live retailer link for this model right now.

Performance

Cooling capacity: 5.3 kW · 18,000 BTU
Heating capacity: 6.3 kW
Total coverage: 40–65 m²
SEER (cooling): 8.6
SCOP (heating): 4.65
Energy class (cooling): A+++
Energy class (heating): A+
Annual energy (cooling): 217 kWh

Noise, size & features

Model number: MU3R19.U23
Indoor noise

What is good

Top A+++ cooling class with very low 217 kWh annual cooling energy use
Compact, lightweight outdoor unit (around 44 kg) and quiet 47 dB(A)
ThinQ Wi-Fi control and UVnano on many compatible indoor units
Runs up to 3 indoor units from one efficient condenser

What to watch

5.3 kW total is best for smaller homes, not large open-plan spaces
Three-port limit, so no fourth or fifth room
Maximum heating output is modest for very cold climates

Installation & the rules that apply

This is a multi-split. Same F-gas certified-installer requirement and sub-750 GWP refrigerant rule as a single split, applied across a bigger system. Because it touches multiple rooms and routes pipes through the structure, it more often triggers planning or prior-declaration steps, freeholder, landlord or condominium and shared-wall consent, and neighbour distance and noise rules. Heritage and historic-centre restrictions apply to the outdoor unit just as for a single split, but the single shared condenser is often easier to get approved than several separate units.

Installation

Certified installer

Refrigerant

R32

BelgiumCopropriete authorisation for shared partsReviewed June 2026Often blocks install

Common questions about the LG MU3R19 (Multi F, 3-room outdoor unit)

How loud is the LG MU3R19 (Multi F, 3-room outdoor unit)?: 19 dB(A) indoors, quieter than a whisper.
How energy-efficient is the LG MU3R19 (Multi F, 3-room outdoor unit)?: Its efficiency rating is SEER 8.6.
Do I need a professional to install the LG MU3R19 (Multi F, 3-room outdoor unit)?: Yes. As a multi-split it needs a certified installer. Usually needs permission.
Does the LG MU3R19 (Multi F, 3-room outdoor unit) heat as well as cool?: Yes. It also heats, rated 6.3 kW.

More multi-split units

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Hisense

2AMW42U4RGC Multi Split (dual)

The Hisense 2AMW42U4RGC is a compact 4.1 kW R32 dual-split outdoor unit that drives two indoor heads from one small, lightweight condenser. It is a budget-friendly way to cool and heat two rooms, such as a living room and bedroom, without a second outdoor box.

Cooling

4.1 kW