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LG · Multi F MAX · Eight-ZoneThe LG eight-room multi-zone at AirGreenSold and installed by AirGreen across Montreal, Laval, Longueuil, the South Shore and the North Shore.
Check my eight headsLG · 8-room multi-zone · updated October 27, 2026
LG eight-zone heat pump: the Eight-Zone, two full boxes
Eight heads is the most an LG outdoor unit takes: two four-port distribution boxes, every port in use. Four units do it, the Eight-Zone KUMXB481A, KUMXB541A, KUMXB601A and KUMXA481A. On the two 48,000 BTU/h units, at least half the heads must be 7,000s.
The eight-room plate
LG’s maximum, in five numbers
- LG Eight-Zone
- 4 R-32 units
- Distribution boxes
- 2 × 4 ports, full
- On a 48,000
- at least 4 heads at 7,000
- Average branch, at most
- 11.25 m
- Indicative LogisVert
- $1,690 to $4,200
Sources: LG R-32 combination manuals (Multi F MAX and LGRED°), KUMXA361A and KUMXB601A spec sheets, NEEP, read October 14, 2026; LogisVert list of October 27, 2026.
LG’s maximum
Eight heads: every port in use
Eight is the last room count an LG outdoor unit accepts. The four units that do it are the ones LG calls Eight-Zone.
Two four-port boxes, on a Y
2 × 4ports, with two PMBD3640ZR or PMBD3641ZR
ARBLN03321the Y-branch joining the two boxes
LG allows at most two distribution boxes per outdoor unit, and a box has four ports at most. Eight heads fill everything: no ninth room is possible on an LG system.
LG in fact measures the certified rating of the KUMXB481A, KUMXB541A and KUMXB601A with eight 16.4 ft branches behind a 16.4 ft main line, 147.6 ft of piping in all.
KUMXA481A: eight heads, not six
The only LGRED° with eight heads. LG’s combination manual for its R-32 LGRED° units (PDF dated January 15, 2026) gives it eight heads and 18,000 to 65,000 BTU/h of connected capacity. LG’s LGRED page announces “up to 6 zones” for the whole range: we follow the document that lists the model.
$4,200indicative LogisVert, Cold Climate certified
39,200BTU/h certified at −25°C, its coldest test point
Pairing
Eight heads on a 48,000: half at 7,000
Eight 9,000 heads make 72,000, too much for the 65,000 of the KUMXB481A and KUMXA481A. The tool opens on four 9,000s and four 7,000s, or 64,000. The KUMXB541A takes all eight 9,000s; the KUMXB601A, up to three 12,000s with five 9,000s.
Total connected: 64,000 BTU/h
This combination fits LG’s range of 18,000 BTU/h to 65,000 BTU/h.
Indicative LogisVert: $1,690
Connected capacity ranges and largest wall head with 8 heads: LG R-32 combination data manuals (PDFs dated January 15, 2026). With 8 heads, the tool checks neither exclusions by head type nor the capacity per distribution-box port: we confirm those on the quote.
9,000 × 872,000 · too much
9,000 × 4 + 7,000 × 464,000 · fits
15,000 + 7,000 × 764,000 · fits
18,000 + 7,000 × 767,000 · too much
Marker: ceiling of the KUMXB481A and KUMXA481A, 65,000 BTU/h of connected heads.
| Unit (LG ceiling) | All at 9,000 | All at 12,000 | Largest head, the rest at 7,000 |
|---|---|---|---|
| 48,000 units, ceiling 65,000 | 72,000 · no; 9,000 × 4 + 7,000 × 4 = 64,000 | no | 15,000 (64,000); 18,000 and 24,000 · no |
| KUMXB541A, ceiling 73,000 | 72,000 · yes | no, not even one 12,000 with seven 9,000s (75,000) | 24,000 (73,000, exact ceiling) |
| KUMXB601A, ceiling 81,000 | 72,000 · yes | 96,000 · no; 12,000 × 3 + 9,000 × 5 = 81,000 | 24,000 (73,000) · yes |
Piping
Eight branches within 90 m
Eight branches, 11.25 m on average
11.25 m11.25 m11.25 m11.25 m11.25 m11.25 m11.25 m11.25 m
090 m · 295.3 ft
The 90 m (295.3 ft) of branches LG allows are shared among eight heads: 11.25 m (36.9 ft) on average at most, while a single branch may run up to 15 m. The more heads sit far from their box, the closer the others must be.
Limits read on LG’s KUMXA361A and KUMXB601A spec sheets; for the KUMXB481A, KUMXB541A and KUMXA481A, presumed identical and checked on the quote.
Every unit for eight rooms
LG’s four Eight-Zone units
Three standard Multi F MAX units and one Multi F MAX with LGRED°. Our 8-zone collection holds the KUMXB481A; the eight-head listings of the KUMXA481A, KUMXB541A and KUMXB601A are online outside the collection and on the Multizones page.
Multi F MAX
Heats down to −20°C · 3 units
Multi F MAX with LGRED°
LGRED°Heats down to −25°C · 1 unit
- KUMXA481A$4,2008 heads at most · 18,000 to 65,000 BTU/hEight-Zone
This collection
Three eight-head listings, one on the list
On the LogisVert list of October 27, 2026, the 8-zone collection has a single listing, the KUMXB481A, at $1,690. For the other two, the R-410A LMU480HV and LMU600HV, there is no NEEP, ENERGY STAR or Hydro-Québec record.
$1,690KUMXB481A, the listed unit
$1,860 and $2,100KUMXB541A and KUMXB601A, eight-head listings outside the collection
$4,200KUMXA481A, Cold Climate, outside the collection
| Outdoor unit | Refrigerant | LG family | Max. heads (LG) | LogisVert |
|---|---|---|---|---|
| KUMXB481A | R-32 | Multi F MAX | 8 | $1,690 |
| LMU480HV | R-410A | not confirmed | not confirmed | not on the list |
| LMU600HV | R-410A | not confirmed | not confirmed | not on the list |
In the store the KUMXB481A is titled “Multi F”: it is a Multi F MAX according to LG. The maximum head count and family of the LMU480HV and LMU600HV are not confirmed by any LG document read.
No eight-room LG multi-zone is part of our published projects yet.
See our LG projectsFrequently asked questions
What people ask us most
Is eight rooms the maximum for an LG system?
Yes. Eight heads fill two four-port distribution boxes joined by a Y-branch, and LG does not allow a third box. Four R-32 units do it.
Do eight 9,000 heads fit on a 48,000 unit?
No: 72,000 passes the 65,000 ceiling. At least four heads must be 7,000s: four 9,000s and four 7,000s make 64,000. The largest head possible there is a 15,000, with seven 7,000s.
Which LG unit takes eight 12,000 heads?
None: 96,000 passes the 81,000 of the KUMXB601A, which takes three 12,000s with five 9,000s. The KUMXB541A takes eight 9,000s, or one 24,000 and seven 7,000s.
Does the KUMXA481A take six or eight heads?
Eight, according to the LG combination manual that lists this model. LG’s LGRED page mentions 6 zones at most for the whole range; we follow the document that names the KUMXA481A.
AirGreen · Air conditioning & heating
Eight rooms on one LG unit, two full boxes and every branch measured, planned 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.
Hydro-Québec does not solicit anyone by phone or door to door for LogisVert. If a call “from Hydro-Québec” offers you 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
- LG Electronics U.S.A., R32 Multi F and Multi F MAX Outdoor Unit Combination Data Manual and … with LGRED° … (files 05_25, PDFs dated January 15, 2026): head counts, connected capacity ranges, allowed heads.
- LG Electronics U.S.A., R-32 spec sheets KUMXA361A, KUMXA421A and KUMXB601A (2026): distribution boxes, Y-branch, piping limits, branch count of the reference rating.
- NEEP ccASHP list and ENERGY STAR Certified Air-Source Heat Pumps (dataset w7cv-9xjt), read October 14, 2026.
- Hydro-Québec, LogisVert list of October 27, 2026 and participation guide version 1.10 (September 15, 2026).
- AirGreen, airgreen.ca product pages and collections, October 27, 2026.
LogisVert amounts are indicative: Hydro-Québec confirms them when you apply. The program rules and LG’s warranty are explained once, on the LG page. Prices on quote.
The LG eight-room shop
The LG eight-head systems, LG’s maximum.
Each product page shows one outdoor unit with eight heads and its AHRI number. On a 48,000 BTU/h unit, check your heads with the pairing tool first.
