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R-410A · not on NEEP or ENERGY STAR
GREE Multi21+ · 3 rooms · Updated Oct. 27, 2026

GREE Multi21+ triple-zone heat pumps. Three rooms, four sizes, twelve combinations at most. The 36,000 and the 42,000 take exactly the same ones.

4 Multi21+ three-room systems, from 24,000 to 42,000 BTU/h. GREE Comfort lists 37 three-unit combinations for these four sizes, and each one also exists in the table of the same-size Free Match M R32. With no NEEP or ENERGY STAR record, the Multi21+ has one source of certified figures: its 2017 AHRI certificates.

Check my three unitsSee the 12 combinationsBook my free estimate
12 = 12Three-unit combinations on the 36,000 and on the 42,000: the same ones. Yet the 42,000’s AHRI certificate gives it 29,000 BTU/h at −8.3 °C, against 20,000.
37 / 37Every Multi21+ three-unit combination appears in GREE Canada’s table for the Free Match M R32 of the same size.
246 ftThree units at 82 ft, the 30,000’s per-unit maximum: 16 ft more than its 230 ft total allowance. On the 36,000 and 42,000, it is exactly the limit.
  • 4Multi21+ three-room systems
  • 24,000–42,000BTU/h, nominal
  • 5 · 8 · 12 · 12three-unit combinations, 24,000 to 42,000
  • 0/4on NEEP, ENERGY STAR or the LogisVert list
AirGreen × GREEGREE Elite dealerMulti21+ · three roomsTwelve combinations on the 36,000 and 42,00037 combinations, all in the R-32 tableFree estimate at home
Your Multi21+ trio

Your three units: which Multi21+ lists them, and does the same-size R-32 take them?

Pick the three sizes. For the 24,000, 30,000, 36,000 and 42,000: GREE Comfort’s list, then GREE Canada’s table for the Free Match M R32 of the same capacity.

Three units, four sizes

Pick the size of each unit on your Multi21+. A green card: the combination is listed for the Multi21+ and in the table of the same-size Free Match M R32, shown as “R-32”.

On the Multi21+ side, the list comes from GREE Comfort’s 2018 brochure. On the R-32 side, from GREE Canada’s Free Match M R32 tables, in their Oct. 14, 2026 version, unchanged on Oct. 26, 2026; they also give each room’s heat, which the tool on the GREE triple-zone page shows. GREE Comfort publishes none for the Multi21+.

The twelve combinations

36,000 or 42,000: same combinations, 9,000 BTU/h apart at −8.3 °C.

The 30,000 keeps the 24,000’s five combinations, the 36,000 the 30,000’s eight, and the 42,000 adds none with three units. Going up a size, what really changes: the certified heat and the line set.

Three units thousand BTU/h24,00030,00036,00042,000
9 + 9 + 9✓✓✓✓
9 + 9 + 12✓✓✓✓
9 + 9 + 18✓✓✓✓
9 + 12 + 12✓✓✓✓
12 + 12 + 12✓✓✓✓
9 + 9 + 24—✓✓✓
9 + 12 + 18—✓✓✓
12 + 12 + 18—✓✓✓
9 + 12 + 24——✓✓
9 + 18 + 18——✓✓
12 + 12 + 24——✓✓
12 + 18 + 18——✓✓
Three-unit combinations581212
Heating at −8.3 °C, 2017 AHRI certificate16,60018,00020,00029,000
Heating at 8.3 °C, same certificate26,00030,00042,50045,000
Total line set allowed197 ft230 ft246 ft246 ft
Three units at the maximum our arithmetic195 ft246 ft16 over246 ft246 ft

Combinations: GREE Comfort Multi21+ brochure (2018). Capacities: AHRI certificates 9956415 to 9956418 of Jan. 20, 2017. Lengths: 2019 to 2022 submittals. “Three units at the maximum”: three times the length allowed to any one unit (65 ft on the 24,000, 82 ft above), to compare with the total allowed.

Between the 36,000 and the 42,000, you choose heat

Same twelve trios, same 246 ft total, same 82 ft per unit. What separates them in the documents: 29,000 BTU/h at −8.3 °C on the 42,000’s certificate, 20,000 on the 36,000’s.

The same line for two rooms: Multi21+ dual-zone. The Free Match M R32 and MULTI R32 for three rooms: GREE triple-zone page. Per GREE Comfort, Multi GEN2 indoor units also work with Multi21+ outdoor units.

AirGreen × GREE

Three rooms on a Multi21+: we check before you decide.

GREE Comfort documented every combination. AirGreen checks yours, measures the three line sets and shows you the same-size R-32 option.

GREE

What GREE brings

  • From the 24,000 to the 42,000The 24,000 stops at three units; the 30,000 goes up to four, the 36,000 and 42,000 up to five.
  • Public certificatesEach size has its 2017 AHRI certificate, published by GREE Comfort.
  • SubmittalsLengths, heights, charge and circuit, size by size, from 2019 to 2022.
AirGreen

What AirGreen brings

  • GREE Elite dealerGREE training completed, priority access to original parts.
  • Free estimateWe note your model, your three units and their distances, then compare.
  • RBQ 5645-9605-01Licences 15.8, 15.10 and 16. Gas and oil work is done by a licensed partner.

The result: your three rooms, with the combination, the line sets and the R-32 option checked before any decision.

Check my three unitsBook my free estimate
The GREE shop

All 4 Multi21+ three-room systems, right below.

Each product sheet carries the AHRI number of its size’s 2017 certificate, 9956415 to 9956418.

GREE
Technician’s corner

Three-room Multi21+: line sets, circuit, warranty.

Three line sets, the real ceiling

On the 30,000, the per-unit limit (82 ft) and the total (230 ft) do not go together: three units at 82 ft need 246 ft. The 36,000 and 42,000 allow 246 ft in total, exactly three times 82 ft. On the 24,000, three times 65 ft is 195 ft, under the 197 allowed. Factory charge for 98 ft (24,000) or 131 ft, then 0.21 oz per foot.

GREE Comfort submittals

The circuit

MCA and MOCP per GREE Comfort: 23 and 30 A (24,000), 20 and 30 A (30,000), 23 and 35 A (36,000), 24 and 40 A (42,000). The 30,000 needs the lowest MCA of the four. The nameplate is what counts, and the electrical hookup falls under our RBQ 16 licence.

2018 brochure · submittals

The published warranty

US only, and it varies from one document to the next: 5 years on parts (2018 to 2021), 5 years parts and compressor (2020 brochure), 5 years parts and 7 years compressor (2022 submittal for the 42,000). No Canadian term is published.

GREE Comfort
Did you know?

Four things to know about the three-room Multi21+.

LogisVert · Hydro-Québec

Three rooms: nothing for the Multi21+, $2,832 to $5,340 for a new same-size R-32.

Three roomsMulti21+New same-size R-32
24,000not on the list$2,832
30,000not on the list$3,360
36,000not on the list$4,320
42,000not on the list$5,340

Hydro-Québec’s list dated Oct. 27, 2026, indicative amounts. R-32: the same amount for the Free Match M R32 and the MULTI R32 at these four sizes, both ENERGY STAR cold climate.

LogisVert requires a new, complete system certified ENERGY STAR, and no Multi21+ has an ENERGY STAR record. Changing one of the three units on an existing Multi21+ earns no amount. For the rest of the program, see the GREE multi-zone page.

Questions

What people ask us about the three-room Multi21+.

Which three-unit combinations does my Multi21+ accept?
Five on the 24,000, from 9 + 9 + 9 to 12 + 12 + 12; eight on the 30,000, which adds 9 + 9 + 24, 9 + 12 + 18 and 12 + 12 + 18; twelve on the 36,000 and 42,000. None has two 24,000 units or three 18,000 units.
Is the 42,000 worth it over the 36,000 for three rooms?
Not for the combinations: they are the same twelve. The difference is the certified heat at −8.3 °C: 29,000 BTU/h for the 42,000 against 20,000 for the 36,000, per their 2017 certificates. The heat-loss calculation of your three rooms decides.
Would my three units fit a same-size Free Match M R32?
Yes, for each of the Multi21+’s 37 combinations: GREE Canada’s table carries them all, at the same size. It also gives each room’s heat; the tool on the GREE triple-zone page shows it.
Can my three-room Multi21+ take a fourth unit?
Not the 24,000, which is capped at three. The 30,000 takes four units in three combinations: 9 + 9 + 9 + 9, 9 + 9 + 9 + 12 and 9 + 9 + 12 + 12. The 36,000 and 42,000 go up to five.
Why no LogisVert, and how much for a new R-32?
The Multi21+ has no ENERGY STAR record, which LogisVert has required since Nov. 26, 2025. A new, complete same-size R-32 system is on the list of Oct. 27, 2026 at $2,832 (24,000), $3,360 (30,000), $4,320 (36,000) or $5,340 (42,000), indicative amounts.
How cold can the Multi21+ heat?
GREE Comfort’s documents disagree: −5 °F in the 2018 brochure and the 2019 to 2022 submittals, two of which print −21 °C; −4 °F, or −20 °C, in the 2020 brochure. No capacity is certified below 17 °F (−8.3 °C).
AirGreen

Three rooms on a Multi21+? We check the combination and the line sets, then compare with the R-32.

Free estimate at home. Montréal, Laval, Longueuil, South Shore and North Shore.

Contact us514-316-2973
GREE Elite dealerGREE training completed, priority access to original parts.
RBQ 5645-9605-01Licences 15.8, 15.10 and 16.
AHRI on every product pageThis page shows a LogisVert amount only when it matches Hydro-Québec’s list of Oct. 27, 2026.
Sources

Certified capacities: 2017 AHRI certificates, as published by GREE Comfort. LogisVert amounts: indicative, to be confirmed in the quote. Page updated Oct. 26, 2026; NEEP, ENERGY STAR and the LogisVert list checked again that day for these four AHRI numbers.