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LG · R-32 multi-zone · updated October 14, 2026

LG multi-zone heat pumps: 2 to 8 rooms on one outdoor unit

Q: Does an LG multi-zone heat at -25°C?

The LGRED° versions do: their heating range goes down to -25°C, per LG. Standard Multi F and Multi F MAX stop at -20°C. In Montréal the daily minimum drops below -20°C about 12 days a year.

LG sells its multi-zone systems under four names: Multi F, Multi F MAX and their LGRED° versions. The name tells you two things: how many rooms one outdoor unit can heat (2 to 8) and how cold it keeps heating (−20°C or −25°C, per LG’s spec sheets). Every figure on this page comes from LG’s documents, NEEP, Environment Canada and Hydro-Québec’s LogisVert list of October 14, 2026.

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The Multi F plate

The R-32 range in five numbers

R-32 outdoor units: 13, in 4 families
Rooms per outdoor unit: 2 to 8
Heats down to: −20°C · −25°C LGRED°
Max. output at −25°C: 39,200 BTU/h KUMXA481A
Indicative LogisVert: $740 to $4,200

Sources: LG R-32 combination manuals (2026), LG spec sheets, NEEP and Hydro-Québec, read October 14, 2026.

LG’s four families

Multi F or Multi F MAX, with or without LGRED°: what each name changes

Multi F runs each room straight to the outdoor unit. Multi F MAX goes through one or two branch distribution boxes, which is how it reaches 8 heads. LGRED° is LG’s name for its cold-climate heating.

R-32

Multi F

One pair of pipes per room, run straight to the outdoor unit.

KUMXB181AKUMXB241AKUMXB301AKUMXB361A

Rooms, at most2/3/4
Heads (total)14,000 to 48,000 BTU/h
Heats down to−20°C
ENERGY STAR Cold ClimateNo
Indicative LogisVert$740 to $1,050

R-32

Multi F MAX

One main line to one or two branch distribution boxes, then one line per room.

KUMXB481AKUMXB541AKUMXB601A

Rooms, at most8
Heads (total)18,000 to 81,000 BTU/h
Heats down to−20°C
ENERGY STAR Cold ClimateNo
Indicative LogisVert$1,690 to $2,100

LGRED°

Multi F with LGRED°

Multi F direct piping, with LG’s LGRED° cold-climate heating technology.

KUMXA181AKUMXA241AKUMXA301A

Rooms, at most2/3/4
Heads (total)14,000 to 40,000 BTU/h
Heats down to−25°C
ENERGY STAR Cold ClimateYes
Indicative LogisVert$1,668 to $2,388

LGRED°

Multi F MAX with LGRED°

Multi F MAX distribution boxes, with LGRED°.

KUMXA361AKUMXA421AKUMXA481A

Rooms, at most5/6/8
Heads (total)18,000 to 65,000 BTU/h
Heats down to−25°C
ENERGY STAR Cold ClimateYes
Indicative LogisVert$3,552 to $4,200

The names are those of LG’s documents: Multi F, Multi F MAX, Multi F with LGRED°, Multi F MAX with LGRED°. Head capacity: the mix-and-match ranges in LG’s combination manuals (2026). Heating: the operating ranges on LG’s spec sheets (−4°F and −13°F, wet bulb).

Choose by room count

How many rooms do you want to heat?

Pick the number of indoor heads. The list keeps the R-32 outdoor units LG allows for that count, with their certified maximum output in deep cold and the indicative LogisVert amount.

Rooms:

13 R-32 outdoor units

KUMXB181A

Multi F

Rooms2 to 2Connected heads14,000 to 24,000 BTU/hMax. at −15°C17,700 BTU/hMax. at −20°C14,800 BTU/hIndicative LogisVert$740

See this system with 2 heads

KUMXB241A

Multi F

Rooms2 to 3Connected heads14,000 to 33,000 BTU/hMax. at −15°C18,400 BTU/hMax. at −20°C15,400 BTU/hIndicative LogisVert$765

See this system with 2 heads

KUMXB301A

Multi F

Rooms2 to 4Connected heads14,000 to 40,000 BTU/hMax. at −15°C24,000 BTU/hMax. at −20°C20,400 BTU/hIndicative LogisVert$1,000

See this system with 2 heads

KUMXB361A

Multi F

Rooms2 to 4Connected heads14,000 to 48,000 BTU/hMax. at −15°C25,200 BTU/hMax. at −20°C20,800 BTU/hIndicative LogisVert$1,050

See this system with 2 heads

KUMXB481A

Multi F MAX

Rooms2 to 8Connected heads18,000 to 65,000 BTU/hMax. at −15°C39,600 BTU/hMax. at −20°C34,500 BTU/hIndicative LogisVert$1,690

See this system with 2 heads

KUMXB541A

Multi F MAX

Rooms2 to 8Connected heads18,000 to 73,000 BTU/hMax. at −15°C40,500 BTU/hMax. at −20°C35,200 BTU/hIndicative LogisVert$1,860

See this system with 2 heads

KUMXB601A

Multi F MAX

Rooms2 to 8Connected heads18,000 to 81,000 BTU/hMax. at −15°C52,500 BTU/hMax. at −20°C45,200 BTU/hIndicative LogisVert$2,100

See this system with 2 heads

KUMXA181ALGRED°

Multi F with LGRED°

Rooms2 to 2Connected heads14,000 to 24,000 BTU/hMax. at −15°C22,000 BTU/hMax. at −25°C17,830 BTU/hIndicative LogisVert$1,668

See this system with 2 heads

KUMXA241ALGRED°

Multi F with LGRED°

Rooms2 to 3Connected heads14,000 to 33,000 BTU/hMax. at −15°C26,000 BTU/hMax. at −25°C19,480 BTU/hIndicative LogisVert$2,136

See this system with 2 heads

KUMXA301ALGRED°

Multi F with LGRED°

Rooms2 to 4Connected heads14,000 to 40,000 BTU/hMax. at −15°C30,000 BTU/hMax. at −25°C21,780 BTU/hIndicative LogisVert$2,388

See this system with 2 heads

KUMXA361ALGRED°

Multi F MAX with LGRED°

Rooms2 to 5Connected heads18,000 to 48,000 BTU/hMax. at −15°C45,000 BTU/hMax. at −25°C35,900 BTU/hIndicative LogisVert$3,552

See this system with 2 heads

KUMXA421ALGRED°

Multi F MAX with LGRED°

Rooms2 to 6Connected heads18,000 to 56,000 BTU/hMax. at −15°C48,000 BTU/hMax. at −25°C37,100 BTU/hIndicative LogisVert$3,792

See this system with 2 heads

KUMXA481ALGRED°

Multi F MAX with LGRED°

Rooms2 to 8Connected heads18,000 to 65,000 BTU/hMax. at −15°C52,500 BTU/hMax. at −25°C39,200 BTU/hIndicative LogisVert$4,200

See this system with 2 heads

LG’s rules: at least two heads per outdoor unit. On a Multi F MAX the heads must add up to at least 18,000 BTU/h, so two 7,000 BTU/h heads are not enough. Output: NEEP certified maximums at −15°C (5°F) and at the coldest test point. Amounts: Hydro-Québec’s list of October 14, 2026, to be confirmed by Hydro-Québec.

A Montréal winter

−20°C or −25°C: what the heating limit means here

Cold nights, counted

12days a year below −20°C (daily minimum)

0.21day a year below −30°C, about one winter in five

Montréal-Trudeau airport, Environment Canada 1991-2020 normals. The average January daily minimum is −13.5°C.

Standard Multi F and Multi F MAX heat down to −20°C, the LGRED° versions down to −25°C (LG spec sheets). The published operating range stops there: on colder nights the house needs backup heat. With an LGRED°, those nights are rarer.

Certified maximum output in deep cold

at −15°Cat −20°C, standard limitat −25°C, LGRED° limit

Source: NEEP ccASHP list, maximum values by AHRI number, read October 14, 2026.

LogisVert

Same size, two amounts: why an LGRED° gets more

Hydro-Québec pays $120 per 1,000 BTU/h of certified output at −8°C for a unit with ENERGY STAR Cold Climate certification, and $50 otherwise (participation guide, version 1.10). The six R-32 LGRED° units are Cold Climate certified; the seven standard Multi F and Multi F MAX are not.

Certified output at −8°C (17°F) and amount from Hydro-Québec’s list of October 14, 2026. Indicative amounts: Hydro-Québec confirms them when you apply.
Nominal size (BTU/h)	LGRED°	Output at −8°C	Amount	Standard	Output at −8°C	Amount
18,000 BTU/h	KUMXA181A	13,900 BTU/h	$1,668	KUMXB181A	14,800 BTU/h	$740
24,000 BTU/h	KUMXA241A	17,800 BTU/h	$2,136	KUMXB241A	15,300 BTU/h	$765
30,000 BTU/h	KUMXA301A	19,900 BTU/h	$2,388	KUMXB301A	20,000 BTU/h	$1,000
36,000 BTU/h	KUMXA361A	29,600 BTU/h	$3,552	KUMXB361A	21,000 BTU/h	$1,050
48,000 BTU/h	KUMXA481A	35,000 BTU/h	$4,200	KUMXB481A	33,800 BTU/h	$1,690

The full program rules (12,000 BTU/h minimum, 9-month deadline, invoice showing the AHRI and RBQ numbers) are explained once on the LG page.

The AHRI number

One outdoor unit, several efficiency ratings

22.5KUMXB181A SEER2 with two 9,000 BTU/h wall heads

18.5SEER2 of the same unit with two ducted heads

LG rates every head combination separately: for the KUMXB181A alone, its R-32 combination manual gives SEER2 22.5 with two wall heads and 18.5 with two ducted heads.

What the number on our product pages certifies

Each LG multi-zone product page carries the AHRI number of its outdoor unit. NEEP files these 13 R-32 certificates as “Multizone All Non-Ducted”: they describe a system built with ductless heads such as wall units. With ducted heads or cassettes the real efficiency changes, and we work it out on the quote with the heads you choose.

Multi F MAX installation

What a Multi F MAX needs at installation

From LG’s spec sheets for the R-32 KUMXA361A and KUMXB601A (2026). The LG parts we stock are in LG parts and accessories.

At least one branch distribution box, even for 2 rooms, and two at most, joined by a Y-branch (ARBLN03321 on R-32 units).
Boxes with 2, 3 or 4 ports (PMBD3620ZR, PMBD3630ZR, PMBD3640ZR or PMBD3641ZR): past 4 rooms you need two.
Up to 475.7 ft (145 m) of total piping, 98.4 ft (30 m) of rise between the outdoor unit and a head, 49.2 ft (15 m) between two heads.
Drain pan heater factory-installed on the Multi F MAX with LGRED° (KUMXA361A sheet), optional (PQSH1200) on the standard Multi F MAX (KUMXB601A sheet).
Cooling down to −10°C (14°F), and down to −20°C with LG’s wind baffle kit.
Outdoor sound: 53/55 dB(A) cooling/heating for the KUMXA361A, 56/58 dB(A) for the KUMXB601A (anechoic chamber, ISO 3745).

R-410A generation

The R-410A multi-zone units still listed

Three R-410A Multi F with LGRED° units are on the October 14, 2026 LogisVert list: LMU180HHV ($1,764), LMU240HHV ($2,088), LMU300HHV ($2,268).

The other R-410A multi-zone units in our catalogue (LMU180HV, LMU240HV, LMU30CHV, LMU36CHV, LMU360HHV, LMU420HHV, LMU480HV, LMU600HV) are not on it and were not listed by ENERGY STAR that day, so they carry no LogisVert amount. For a new project, the R-32 range above is the one LG documents today.

No LG multi-zone job is published in our project gallery yet: the 26 LG jobs online are wall units and one console.

See our LG projects

Frequently asked questions

What people ask us most

How many rooms can one LG outdoor unit heat?

2 to 8. A Multi F takes 2, 3 or 4 heads depending on the model, a Multi F MAX up to 8, and a Multi F MAX with LGRED° 5, 6 or 8. LG requires at least two heads.

Multi F or Multi F MAX: which one?

Up to 4 rooms, a Multi F does the job with one pair of pipes per room. Beyond that, or when the rooms are far from the outdoor unit, the Multi F MAX runs through distribution boxes and allows up to 475.7 ft of total piping.

Does an LG multi-zone heat at −25°C?

The LGRED° versions do: their heating range goes down to −25°C, per LG. Standard Multi F and Multi F MAX stop at −20°C. In Montréal the daily minimum drops below −20°C about 12 days a year.

Why don’t two multi-zone units of the same size get the same LogisVert amount?

Hydro-Québec pays $120 per 1,000 BTU/h for ENERGY STAR Cold Climate units and $50 for the others. For 2 rooms, the KUMXA181A (LGRED°) is at $1,668 and the KUMXB181A (standard) at $740 on the October 14, 2026 list.

Can I mix wall units, cassettes, ducted units and consoles on one outdoor unit?

Yes, within the limits LG sets for each model (allowed head types and sizes, total connected capacity). Efficiency changes with the mix, and we work it out on the quote.

Do I need a distribution box?

Only with a Multi F MAX: it needs at least one, even for 2 rooms, and two joined by a Y-branch beyond 4 rooms. The Multi F does not use one.

What does the AHRI number on a multi-zone product page mean?

It identifies the outdoor unit’s certification with ductless heads. Hydro-Québec uses that number for LogisVert, and it is the number we put on the invoice.

AirGreen · Air conditioning & heating

Your LG multi-zone, chosen room by room with you and installed by AirGreen.

We come see your home, choose the series and size with you, and hand you a clear quote with the AHRI number and the indicative LogisVert amount when the unit qualifies.

Book my free estimate 514 316-2973

Hydro-Québec does not solicit anyone by phone or door to door for LogisVert. A call “from Hydro-Québec” selling a heat pump? Hang up.

RBQ 5645-9605-01Subclasses 15.8, 15.10 and 16

Free estimateAt home, no obligation

LogisVert checkedBy AHRI number, in Hydro-Québec’s tool

Showroom1370 Joliot-Curie Street, Suite 712, Boucherville

Sources checked October 14, 2026

LG Electronics U.S.A., R32 Multi F and Multi F MAX Outdoor Unit Combination Data Manual (file 05_25, PDF dated January 15, 2026) and … with LGRED° … (same date): head counts, connected capacity ranges, combination tables.
LG Electronics U.S.A., R-32 spec sheets KUMXA361A (SB_…_1_26B) and KUMXB601A (2026): operating ranges, piping, distribution boxes, sound.
NEEP ccASHP list, searched by AHRI number, read October 14, 2026 (records updated August 24, 2026).
ENERGY STAR, Certified Air-Source Heat Pumps (dataset w7cv-9xjt), October 14, 2026.
Hydro-Québec, LogisVert eligible heat pump list of October 14, 2026, and participation guide version 1.10 (September 15, 2026).
Environment and Climate Change Canada, 1991-2020 climate normals, Montréal-Trudeau airport, ID 7025250.
AirGreen, “Nos réalisations” blog and airgreen.ca product pages, October 14, 2026.

LogisVert amounts are indicative: Hydro-Québec confirms them when you apply. Prices on quote.

The LG multi-zone shop