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R-410A · 2017 AHRI certificates
GREE Multi21+ · 2 rooms · Updated Oct. 27, 2026

GREE Multi21+ dual-zone heat pumps. It starts with a single indoor unit, has no ENERGY STAR record, and nearly all its pairs exist in R-32 at the same size.

5 Multi21+ two-room systems, from 18,000 to 42,000 BTU/h. An R-410A line from GREE Comfort, with AHRI certificates dated Jan. 20, 2017, absent from NEEP, ENERGY STAR and the LogisVert list. Already own one? Find its certificate here, and each pair set against the Free Match M R32 of the same size.

Check my pairRead my AHRI certificateBook my free estimate
36 / 37Of the 37 pairs GREE Comfort lists for the Multi21+, 36 are in GREE Canada’s table for the Free Match M R32 of the same size. The exception: 9 + 9 on the 42,000.
12,800 BTU/hAt −8.3 °C (17 °F) for the 18,000 Multi21+, per its 2017 AHRI certificate. ENERGY STAR lists 17,600 BTU/h for the Free Match M R32 of the same size, measured under the test method in force since 2023, so not on the same basis.
1 unitThe Multi21+ minimum, at every size. The same-size R-32 multi-zones, Free Match M R32 and MULTI R32 alike, need at least two.
  • 5Multi21+ two-room systems
  • 18,000–42,000BTU/h, nominal
  • −8.3 °Ccoldest certified point, on the certificates
  • 2017date of the five AHRI certificates
AirGreen × GREEGREE Elite dealerMulti21+ · two roomsAHRI certificates of Jan. 20, 2017From one indoor unitMontréal, Laval, Longueuil, South Shore, North Shore
Your pair

Does your Multi21+ pair exist in R-32, at the same size?

Pick your two units, or just one. For each size: GREE Comfort’s list for the Multi21+, then GREE Canada’s table for the Free Match M R32 of the same capacity.

One Multi21+, five sizes

Pick each unit’s size. “None” for the second room: your Multi21+ runs a single unit. On each card, “R-32” means the Free Match M R32 of the same size.

Multi21+: GREE Comfort’s 2018 brochure. Free Match M R32: GREE Canada’s combination tables, read Oct. 14, 2026, same version on Oct. 26, 2026. The MULTI R32 has no published table. GREE Comfort publishes no per-room heat for the Multi21+; the Free Match M R32’s is on the GREE dual-zone page.

Your AHRI certificate

Five certificates dated Jan. 20, 2017: your Multi21+ heat at 8.3 °C and −8.3 °C.

The AHRI number on each product sheet leads to a certificate GREE Comfort publishes, for a system with non-ducted units. These are the Multi21+’s only certified heating figures: NEEP has none.

Multi21+18,00024,00030,00036,00042,000
AHRI number (Jan. 20, 2017)99589759956415995641699564179956418
Heating at 8.3 °C (47 °F)19,00026,00030,00042,50045,000
Heating at −8.3 °C (17 °F)12,80016,60018,00020,00029,000
Indoor units1 to 21 to 31 to 41 to 51 to 5
Pairs listed by GREE Comfort2691010
NEEP, ENERGY STAR, LogisVert listnot listednot listednot listednot listednot listed
Same-size R-32 at −8.3 °C ENERGY STAR17,600 · 16,00023,60028,00036,00044,500
Same-size R-32, LogisVert$2,112 · $1,920$2,832$3,360$4,320$5,340

AHRI certificates published by GREE Comfort, read Oct. 26, 2026: 2017 ratings, with non-ducted indoor units. R-32: Free Match M R32 (GWHD…ND6MO) and MULTI R32 (MUL…R32AO); at 18,000, Free Match M R32 then MULTI R32. ENERGY STAR read Oct. 26, 2026, under the test method in force since Jan. 1, 2023: a reference point, not a strict comparison. LogisVert: list of Oct. 27, 2026, indicative.

The same line for three rooms: Multi21+ triple-zone. The Free Match M R32 and MULTI R32 for two rooms: GREE dual-zone page. Multi GEN2 indoor units are, per GREE Comfort, backward compatible with the Multi21+.

Keep or replace

One unit on your Multi21+ needs replacing: two paths, two outcomes.

What follows comes from GREE Comfort, GREE Canada and Hydro-Québec documents. The rest is decided at your home, in front of the unit.

Keep the Multi21+

  • GEN2 indoor units that fitGREE Comfort states that Multi GEN2 indoor units are backward compatible with MULTI CO outdoor units.
  • No LogisVert amountReplacing a single indoor or outdoor unit is on the list of ineligible work.
  • Still on R-410AR-410A’s global warming potential: 2,088 per ENERGY STAR, against 675 for R-32.

A new, complete R-32 system

  • On the LogisVert listFree Match M R32 from $2,112 to $5,340, MULTI R32 from $1,920 to $5,340, from 18,000 to 42,000 BTU/h, all ENERGY STAR cold climate.
  • Two units minimumFree Match M R32 and MULTI R32 alike: no fewer than two indoor units. For one room on its own, we compare with a wall unit.
  • The line set, to be assessedNo document we read says whether an R-410A line set can be reused with an R-32 unit: we check it on site.
See the R-32 dual-zones

Backward compatibility: GREE Comfort’s 24,000 Multi GEN2 submittal (May 2023). Ineligible work: LogisVert participant guide, version 1.10. Amounts: Hydro-Québec LogisVert list dated Oct. 27, 2026, indicative. Global warming potentials as listed by ENERGY STAR (“refrigerant with GWP”), Oct. 26, 2026.

AirGreen × GREE

A Multi21+ at home? We start from what you have.

GREE Comfort designed and documented the Multi21+. AirGreen reads your unit’s nameplate, checks the combination and shows you the same-size R-32 option.

GREE

What GREE brings

  • Five public certificatesGREE Comfort publishes each size’s AHRI certificate, with its capacities at 47 °F and 17 °F.
  • Documentation still onlineBrochure, installation and service manuals, submittals: on GREE Comfort’s Multi21+ page as of Oct. 26, 2026.
  • Up to five unitsOn the 36,000 and 42,000; the 18,000 takes two, the 24,000 three, the 30,000 four.
AirGreen

What AirGreen brings

  • GREE Elite dealerGREE training completed, priority access to original parts.
  • Free estimateWe note your unit’s model and AHRI number, then compare it with the same-size R-32.
  • RBQ 5645-9605-01Licences 15.8, 15.10 and 16. Gas and oil work is done by a licensed partner.

The result: a clear decision for your Multi21+: keep it with compatible units, or move to a same-size R-32 on the LogisVert list.

Check my pairBook my free estimate
The GREE shop

All 5 Multi21+ two-room systems, right below.

Each product sheet’s AHRI number is that of the matching size’s 2017 certificate.

GREE
Where the Multi21+ stands

The Multi21+ in six dates.

What each document says about the Multi21+, in order. They do not all agree on the heating limit: we show both values.

  1. Jan. 20, 2017Five AHRI certificatesFrom the 18,000 to the 42,000, non-ducted units: 12,800 to 29,000 BTU/h of heating at 17 °F.
  2. 2018Brochure: −5 °FHeating stated down to −5 °F, 1 to 5 indoor units by size.
  3. 2020Brochure: −4 °FThe 2020 brochure gives −4 °F; the 2019 to 2022 submittals stay at −5 °F, and two of them print −21 °C.
  4. March 2023Out of the catalogGREE Comfort’s catalog no longer includes it; it shows the Multi GEN2 and the Multi+ Ultra.
  5. Nov. 26, 2025LogisVert requires ENERGY STARWith no ENERGY STAR record, the Multi21+ has no possible amount.
  6. Oct. 26, 2026Still documentedGREE Comfort’s Multi21+ page still lists the five models, with brochure, manuals and certificates.

Sources: GREE Comfort’s AHRI certificates, 2018 and 2020 brochures, 2019 to 2022 submittals and Multi21+ page; GREE Comfort’s March 2023 catalog; Hydro-Québec, residential LogisVert page.

Technician’s corner

Two-room Multi21+: the spec sheet, size by size.

The circuit

MCA and maximum overcurrent protection (MOCP) per GREE Comfort: 16 and 25 A on the 18,000, 23 and 30 A on the 24,000, 20 and 30 A on the 30,000, 23 and 35 A on the 36,000, 24 and 40 A on the 42,000. Your unit’s nameplate is what counts.

2018 brochure · submittals

Charge and lengths

Factory R-410A: 56.4, 77.6, 98.8, 128.8 and 128.8 oz, for 33, 98, 131, 131 and 131 ft of line set; 0.21 oz per added foot. Total allowed: 65, 197, 230, 246 and 246 ft; to any unit: 33, 65, then 82 ft.

2018 brochure · submittals

Each room’s capacity

GREE Comfort warns that in multi-zone use, each unit has a minimum capacity 10% higher and a maximum 10% lower than in a one-to-one system, and the outdoor unit limits the whole. No per-room heat is published.

2018 brochure

SEER and HSPF

The 2017 certificates give a SEER and an HSPF (Region IV), measured under the old method. ENERGY STAR has used SEER2 and HSPF2 since Jan. 1, 2023: the two do not compare directly.

AHRI certificates · ENERGY STAR
Did you know?

Six things to know about the two-room Multi21+. Flip the cards.

LogisVert · Hydro-Québec

LogisVert and the Multi21+: $0, and why.

$0Multi21+: none of its five AHRI numbers is on ENERGY STAR or Hydro-Québec’s list.
$0A single unit replaced, indoor or outdoor: the program guide excludes it.
$2,112 to $5,340New Free Match M R32, 18,000 to 42,000 BTU/h, ENERGY STAR cold climate.
$1,920 to $5,340New MULTI R32, same sizes. At 18,000, ENERGY STAR lists 16,000 BTU/h at −8.3 °C for it.

Amounts: LogisVert list of Oct. 27, 2026, for guidance only. Since Nov. 26, 2025, LogisVert only accepts ENERGY STAR-certified heat pumps; its guide (version 1.10) also requires a new complete system, outdoor unit and indoor units included. Program details are on the GREE multi-zone page.

Questions

What Multi21+ owners ask us.

What is my two-room Multi21+, in certified figures?
An R-410A outdoor unit from GREE Comfort, whose AHRI certificate, dated Jan. 20, 2017, covers non-ducted indoor units. Its only certified capacities are at 47 °F and 17 °F: at −8.3 °C, from 12,800 BTU/h for the 18,000 to 29,000 BTU/h for the 42,000. Nothing colder is certified.
Why is there no LogisVert amount for the Multi21+?
LogisVert only pays for ENERGY STAR-certified heat pumps, in a complete new system. None of the Multi21+’s five AHRI numbers is in ENERGY STAR’s data or on Hydro-Québec’s list of Oct. 27, 2026.
Which R-32 system for the same two rooms?
On airgreen.ca, the Free Match M R32 or the MULTI R32 of the same size, both ENERGY STAR cold climate. GREE Canada’s table for the Free Match M R32 carries every Multi21+ pair at the same size, except 9 + 9 on the 42,000. Your rooms’ heat loss confirms the choice.
My Multi21+ runs a single unit. Can an R-32 multi-zone do the same?
No: GREE Canada and GREE Comfort require at least two indoor units on the Free Match M R32 and the MULTI R32. For a single room, the comparison is with a wall heat pump.
Can I replace just one indoor unit on my Multi21+?
Per GREE Comfort’s 24,000 Multi GEN2 submittal, the indoor units on its compatibility chart are backward compatible with MULTI CO outdoor units, the Multi21+ ones. That replacement is not eligible for LogisVert, though.
What warranty applied to the Multi21+?
GREE Comfort only publishes US terms, and they change from one document to the next: 5 years on parts (2018 brochure, 2019 to 2021 submittals), 5 years on parts and compressor for residential (2020 brochure), 5 years on parts and 7 on the compressor (2022 submittal for the 42,000). Nothing is published for Canada; we check your unit’s terms with you.
AirGreen

A two-room Multi21+? Give us its model number: we make the comparison with you.

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 five AHRI numbers.