Home » ZEPHYR Multi-Zone Heat Pump | Installation in Montreal, Laval, Longueuil, South Shore and North Shore
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ZEPHYRMulti-zoneZEPHYR multi-zones at AirGreenSold and installed by AirGreen across Montreal, Laval, Longueuil, the South Shore and the North Shore.
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ZEPHYR multi-zone heat pump · updated October 9, 2026

Zephyr multi-zone heat pumps: 2 to 5 rooms on a single outdoor unit.

A Zephyr multi-zone connects 2 to 5 indoor units to a single outdoor unit, from 18,000 to 42,000 BTU. Two families: the new R-454B one and the R-410A “Zephyr 22”, all ENERGY STAR cold-climate certified. LogisVert is calculated per system, up to $3,384.

2 to 5 roomsR-454B or R-410AENERGY STAR cold climateUp to $3,384 LogisVert
Book my free estimatePlay with the rooms
R-454B multi-zone
ZE-518M225$1,380
ZE-527M325$2,112
ZE-536M425$2,712
ZE-542M525$3,384
Up to $3,384

Amount per system, checked for the first AHRI number of each unit.

ENERGY STAR (Oct. 8, 2026); Hydro-Québec LogisVert tool (Oct. 6, 2026).

20multi-zone systems in our catalogue
2–5indoor units per system
$3,384LogisVert, ZE-542M525
8/8cold-climate outdoor units
AirGreen × ZEPHYRMulti-zone: 2 to 5 roomsENERGY STAR cold climateSold and installed by AirGreenMontreal · Laval · Longueuil · South Shore · North Shore
01 · The rooms

One room, one indoor unit, a single unit outside.

Tap the number of rooms: the house lights up, the line sets draw themselves to the outdoor unit, and we show you the matching Zephyr model.

Room 1Room 2Room 3Room 4Room 51 outdoor unit
2 rooms
2 indoor units
R-454BZE-518M225
R-410AZE-18M222SCO
LogisVert (R-454B)$1,380
Compressors offered (shop names)18 k, 24 k, 36 k, 42 k

R-454B: model made for 2 zones per our page, to be confirmed with TTI. R-410A: up to 2 indoor units per the TTI sheet. For 2 rooms, we also offer larger compressors, after TTI validates the combination.

See the 2-zone systems
Minimum number of indoor units: TTI publishes no minimum or combination table for these units. When we propose a large compressor for few rooms, we validate the combination with TTI before the quote.
Did you know?
2–5indoor units

Per TTI, a Zephyr R-454B multi-zone can be installed with 2 to 5 indoor units on a single outdoor unit, from 18,000 to 42,000 BTU.Source: TTI, “Zephyr Multi Zone R454b” page (tticlimatisation.com), checked Oct. 8, 2026.

02 · The outdoor units

Two Zephyr families, eight outdoor units.

The ENERGY STAR certified figures of each outdoor unit, next to its number of indoor units and the LogisVert amount. Both families carry the same series name at ENERGY STAR: “Hi MULTI Xtreme”.

Outdoor unitRefrigerantIndoor unitsCooling (BTU/h)At +8.3 °CAt -8.3 °CAt -15 °CCOP at -15 °CSEER2LogisVert
ZE-518M225R-454B2 (to confirm)18,00018,00011,50018,0001.9917.5–22$1,380
ZE-18M222SCOR-410Aup to 218,00018,00012,70018,0001.8420–21$1,524 *
ZE-527M325listed as “24,000 BTU” in the shopR-454B3 (to confirm)27,00027,00017,60027,0001.8218–23$2,112
ZE-24M322SCOR-410Aup to 324,00024,00015,00024,0001.8421.5–22$1,800 *
ZE-536M425R-454B4 (to confirm)36,00036,00022,60036,0001.9219–22$2,712
ZE-36M422SCOlisted as “36,000 BTU” in the shopR-410Aup to 432,00032,00022,40036,0001.8420.25–21$2,688 *
ZE-542M525R-454B5 (to confirm)42,00048,00028,20036,0001.9218–22$3,384
ZE-42M522SCOR-410Aup to 542,00042,00027,00036,0001.8419–20$3,240 *

Swipe the table.

Capacities, COP and SEER2: ENERGY STAR (Oct. 8, 2026), first AHRI number of each unit; SEER2: range across the certified AHRI numbers. Indoor units: R-410A, maximum per the TTI sheet; R-454B, number shown on our page, to be confirmed with TTI (TTI only gives the 2 to 5 range for the family). R-454B LogisVert: Hydro-Québec tool (Oct. 6, 2026), first AHRI number. * R-410A: AirGreen calculation per the guide’s rule (ENERGY STAR heat at -8.3 °C × $120 per 1,000 BTU/h), to be confirmed by Hydro-Québec.

Did you know?
3AHRI numbers per unit

Each R-454B multi-zone has three AHRI numbers at ENERGY STAR, depending on the certified indoor-unit combination. For example, the ZE-518M225 ranges from 17.5 to 22 SEER2.Source: ENERGY STAR w7cv-9xjt.

03 · The cold

How much heat at -8.3 and -15 °C?

The heat certified by ENERGY STAR for each outdoor unit, at three temperatures. Tap a temperature.

-15 °C
ZE-518M22518,000 BTU/h100% of rated cooling
ZE-527M32527,000 BTU/h100% of rated cooling
ZE-536M42536,000 BTU/h100% of rated cooling
ZE-542M52536,000 BTU/h86% of rated cooling
ZE-18M222SCO18,000 BTU/h100% of rated cooling
ZE-24M322SCO24,000 BTU/h100% of rated cooling
ZE-36M422SCO36,000 BTU/h113% of rated cooling
ZE-42M522SCO36,000 BTU/h86% of rated cooling
ENERGY STAR certified heatRated cooling capacityScale: 0 to 48,000 BTU/h

ENERGY STAR publishes heat at +8.3, -8.3 and -15 °C as separate test points: on all these records, the -15 °C value exceeds the -8.3 °C one. We show them as published.

Minimum temperature: TTI’s sheet for the R-410A “Zephyr 22” lists heating from -25 to 24 °C. For the R-454B family, TTI does not yet publish a spec sheet or a minimum temperature; we ask TTI for it for your project.
Did you know?
100%of its heat at -15 °C (ZE-518M225)

In its ENERGY STAR record, the ZE-518M225 keeps 18,000 BTU/h at -15 °C, as much as at +8.3 °C, with a COP of 1.99: the highest -15 °C COP of any Zephyr multi-zone.Source: ENERGY STAR, AHRI 216684161; AirGreen comparison across the 20 Zephyr multi-zone AHRI numbers.

04 · LogisVert

One amount per system, not per room.

Hydro-Québec calculates the aid on the installed certified combination, by AHRI number: its heat at -8 °C, times $120 per 1,000 BTU/h for an ENERGY STAR cold-climate unit. Explore each unit’s combinations below the ranking.

ENERGY STAR cold climate: $120 / 1,000 BTU/hENERGY STAR standard: $50 / 1,000 BTU/h
R-410A “Zephyr 22” family
  • ZE-18M222SCO: $1,524 (AirGreen calculation, AHRI 206346128)
  • ZE-24M322SCO: $1,800 (AirGreen calculation, AHRI 206346130)
  • ZE-36M422SCO: $2,688 (AirGreen calculation, AHRI 206347270)
  • ZE-42M522SCO: $3,240 (AirGreen calculation, AHRI 206346134)

AirGreen calculation per the guide’s rule (ENERGY STAR heat at -8.3 °C × $120 per 1,000 BTU/h), to be confirmed by Hydro-Québec.

ZE-542M525 · 5 units
$3,384

ZE-542M525 · R-454B

Heat at -8 °C (Hydro-Québec)28,200 BTU/h
CertificationENERGY STAR cold climate
Math28.2 × $120 = $3,384
AHRI number216684168
See the product
Apply no later than
July 8, 2027

Source: Hydro-Québec, residential LogisVert participation guide v1.10 (Sept. 15, 2026) and eligible heat pump search tool (Oct. 6, 2026). ENERGY STAR required since Nov. 26, 2025; outdoor unit of at least 12,000 BTU/h; capped at 100% of the cost before taxes; apply no later than 9 months after installation; paid by mail 10 to 12 weeks after a complete application. Indicative amounts: Hydro-Québec sets them when you apply. Our LogisVert guide

The amount follows the installed combination
AHRI numberSEER2HSPF2At -8.3 °CAt -15 °CCOP at -15 °CLogisVert
216684161221011,500 BTU/h18,000 BTU/h1.99$1,380checked, Hydro-Québec tool
21668416217.59.411,900 BTU/h17,000 BTU/h1.96$1,428AirGreen calculation, to confirm
21668416319.759.711,700 BTU/h17,400 BTU/h1.96$1,404AirGreen calculation, to confirm

ZE-518M225 · R-454B · 3 certified combinations

Each AHRI number is one indoor-unit combination certified by ENERGY STAR (Oct. 8, 2026). Amount: heat at -8.3 °C × $120 per 1,000 BTU/h, capped at the cost before taxes. “Checked”: number found in Hydro-Québec’s tool (Oct. 6, 2026); the others are calculations to be confirmed by Hydro-Québec.

Did you know?
$1,380ZE-518M225, 2 rooms

For two rooms, the ZE-518M225 qualifies for $1,380 with AHRI 216684161: 11,500 BTU/h at -8 °C × $120 per 1,000 BTU/h. LogisVert does not pay for replacing a single indoor unit.Source: Hydro-Québec, LogisVert tool (Oct. 6, 2026) and guide v1.10, Appendix I.

05 · Installation

How much line set, how much noise, which breaker?

TTI’s “Zephyr 22” (R-410A) sheet details the allowed line set, pre-charge, sound, breaker and weight. Pick a unit.

0 ft50 ft100 ft150 ft200 ft270 ft
Factory pre-chargedTotal allowed (0.161 oz per ft beyond)Beyond
Max. per indoor unit82 ft
Max. total164 ft
Pre-charged49 ft
Max. outdoor sound55 dB
Max. breaker30 A
Weight (TTI sheet)57 kg
Dimensions (W × H × D, in)33.86 × 26.38 × 12.21
Liquid / gas lines1/4 / 3/8 in

Source: TTI “MULTIZONE 22 SEER” sheet (R-410A). Operating range: heating from -25 to 24 °C, cooling from -10 to 46 °C.

R-454B family: TTI does not yet publish these data (product page: “no technical specification available”, Oct. 8, 2026). We obtain them from TTI for your project and put them on the quote.
Did you know?
262 ftof line set in total

The ZE-42M522SCO (5 zones, R-410A) accepts up to 262 ft of line set in total, 66 ft per indoor unit, and comes pre-charged for 123 ft.Source: TTI, “MULTIZONE 22 SEER” spec sheet (R-410A, undated), copy hosted on airgreen.ca, checked Oct. 8, 2026.

06 · Efficiency

SEER2 depends on the combination installed.

Each outdoor unit has two or three AHRI numbers, one per certified combination. We put on the quote the one that matches your indoor units.

SEER2 by certified combination
ZE-518M22517.5–22
ZE-527M32518–23
ZE-536M42519–22
ZE-542M52518–22
ZE-18M222SCO20–21
ZE-24M322SCO21.5–22
ZE-36M422SCO20.25–21
ZE-42M522SCO19–20

Bar: highest SEER2; yellow mark: lowest, among each unit’s AHRI numbers (ENERGY STAR, Oct. 8, 2026). Scale: 0 to 24.

Each bar starts from 1 kWh of electricity. Each segment = 1 kWh of heat delivered (the COP).
ZE-518M225216684161×1.99
ZE-527M325216684164×1.82
ZE-536M425216684171×1.92
ZE-542M525216684168×1.92
ZE-18M222SCO206346128×1.84
ZE-24M322SCO206346130×1.84
ZE-36M422SCO206347270×1.84
ZE-42M522SCO206346134×1.84
Electric baseboardresistance×1

COP at -15 °C (5 °F) per ENERGY STAR, first AHRI number of each unit.

Did you know?
23SEER2, ZE-527M325

The ZE-527M325 (AHRI 216684164) reaches 23 SEER2, the highest of any Zephyr multi-zone at ENERGY STAR.Source: ENERGY STAR w7cv-9xjt.

07 · Refrigerants

R-454B or R-410A? Head to head, size for size.

Both families are ENERGY STAR cold-climate certified. Pick a shop size: we line up the R-454B and the R-410A. The big difference: the refrigerant. R-454B has a GWP of 470 and class A2L; R-410A, 2,090 and A1. In Canada, both remain allowed in residential units.

R-454B · GWP 470

ZE-518M225

18,000 BTU/h cooling

Heat at +8.3 °C18,000 BTU/h
Heat at -8.3 °C11,500 BTU/h
Heat at -15 °C18,000 BTU/h
COP at -15 °C1.99
Highest SEER222
LogisVert$1,380 (checked)
Indoor units2 (to confirm)
R-410A · GWP 2,090

ZE-18M222SCO

18,000 BTU/h cooling

Heat at +8.3 °C18,000 BTU/h
Heat at -8.3 °C12,700 BTU/h
Heat at -15 °C18,000 BTU/h
COP at -15 °C1.84
Highest SEER221
LogisVert$1,524 (AirGreen calc.)
Indoor units2 max. (TTI sheet)

ENERGY STAR w7cv-9xjt (Oct. 8, 2026), first AHRI number of each unit; SEER2: the highest of the certified combinations. LogisVert: R-454B checked in Hydro-Québec’s tool; R-410A calculated by AirGreen, to be confirmed. Scales: 0 to 50,000 BTU/h, COP 0 to 2.5, SEER2 0 to 24.

Refrigerant GWP
R-410AA12,090
R-32A2L675
R-454BA2L470

EPA SNAP, March 19, 2026.

Factory pre-charge (R-410A)
ZE-18M222SCO63.49 oz
ZE-24M322SCO81.13 oz
ZE-36M422SCO105.82 oz
ZE-42M522SCO120 oz

TTI “MULTIZONE 22 SEER” sheet. Scale: 0 to 125 oz.

Did you know?
77.5%lower GWP

R-454B’s GWP (470) is 77.5% lower than R-410A’s (2,090).Source: EPA SNAP (March 19, 2026); AirGreen math.

08 · Timeline

Zephyr multi-zones, date by date.

Swipe left to right. In red: Zephyr; in green: rules and programs.

  1. “Zephyr 22” multi-zone

    Market date of the R-410A family per ENERGY STAR.

    Zephyr
  2. R-454B multi-zone

    Market date of the four R-454B units.

    Zephyr
  3. ENERGY STAR certified

    Certification of the ZE-518M225, ZE-527M325 and ZE-536M425.

    Zephyr
  4. LogisVert requires ENERGY STAR

    Only certified heat pumps remain eligible.

    Rule
  5. ZE-542M525

    ENERGY STAR certification of the 5-zone R-454B.

    Zephyr
  6. Multilogements bonus

    $220 per 1,000 BTU/h at -8 °C for a ductless cold-climate unit in an eligible building.

    Rule
  7. 6-year legal warranty

    For heat pumps bought new from that date (OPC).

    Rule
Did you know?
8cold-climate units

All eight Zephyr multi-zone outdoor units, R-454B and R-410A, are ENERGY STAR cold-climate certified and meet the “Most Efficient” criteria.Source: ENERGY STAR w7cv-9xjt.

AirGreen × ZEPHYR

A ZEPHYR multi-zone, planned room by room.

ZEPHYR supplies the outdoor unit and the indoor units. AirGreen chooses the combination with you, validates it with TTI, routes the line sets and installs.

ZEPHYR

What ZEPHYR brings

  • 2 to 5 indoor unitsOn a single outdoor unit, per TTI.
  • ENERGY STAR cold climateAll eight outdoor units.
  • R-454B or R-410ATwo families, the same “Hi MULTI Xtreme” series.
  • A TTI brandIn Longueuil, since 2005.
AirGreen

What AirGreen brings

  • Sold and installed by AirGreenMontreal, Laval, Longueuil, the South Shore and the North Shore.
  • Free home estimateWe look at the rooms, where the units go and the line set route.
  • Warranty registered for youWith TTI, free of charge: serial numbers, date, photos.
  • RBQ 5645-9605-01Subclasses 15.8 (ventilation), 15.10 (refrigeration) and 16 (electrical).

The result: a single unit outside, the right comfort in every room, a clear quote.

Play with the roomsBook my free estimate
09 · Warranty and installation

What is written, and what the law says.

The R-410A sheet announces 10 years on parts. For a heat pump bought new on or after October 5, 2026, the law adds a 6-year warranty of good working order, counted from delivery.

Zephyr base warranty
10 years

on parts per TTI’s “MULTIZONE 22 SEER” sheet (R-410A). For the R-454B family, TTI does not yet publish a sheet: we put the warranty on the quote.

Parts (Zephyr)
10 years
Legal warranty
6 years

For a heat pump or air conditioner bought new from a merchant on or after October 5, 2026, Quebec law adds a free, automatic 6-year warranty of good working order, counted from delivery (Office de la protection du consommateur). Under TTI’s parts policy (v3.4, July 17, 2026), labour to replace a part during that period falls on the installing contractor.

Certified technician

Service or repair by anyone not certified and authorized by TTI (or Kinghome) ends the manufacturer’s conventional warranty (TTI, s. 4.4).

Through your installer

If something breaks, you call the contractor who installed it; they file the claim with TTI.

Filters, every month

TTI’s policy asks owners to clean the indoor unit filters at least once a month (s. 6.3).

1Free visit

We look at the rooms, where the units go and the line set route.

2Clear quote

The exact model, the AHRI number, the indicative LogisVert amount when it applies.

3Installation and start-up

Vacuum, refrigerant charge, heating and cooling tests.

4Warranty registered

We register the units with TTI for you: nameplate, serial numbers, invoice.

10 · Our projects

Our Zephyr installations.

Each blog post shows one installation: the unit, the place, how it was done.

Installation d’une Zephyr Multi-Zone thermopompe murale à Chomedey (Laval)
Jan. 14, 2026 · in FrenchInstallation d’une Zephyr Multi-Zone thermopompe murale à Chomedey (Laval)
Installation d’une Zephyr thermopompe murale au Plateau-Mont-Royal
Sept. 30, 2026 · in FrenchInstallation d’une Zephyr thermopompe murale au Plateau-Mont-Royal
Installation d’une Zephyr thermopompe murale à Griffintown (Le Sud-Ouest)
Sept. 20, 2026 · in FrenchInstallation d’une Zephyr thermopompe murale à Griffintown (Le Sud-Ouest)
Installation d’une Zephyr thermopompe murale à Mercier–Hochelaga-Maisonneuve
Sept. 19, 2026 · in FrenchInstallation d’une Zephyr thermopompe murale à Mercier–Hochelaga-Maisonneuve
Installation d’une Zephyr thermopompe murale à Le Sud-Ouest
Sept. 14, 2026 · in FrenchInstallation d’une Zephyr thermopompe murale à Le Sud-Ouest
Installation d’une Zephyr — thermopompe murale à Chomedey (Laval)
Sept. 9, 2026 · in FrenchInstallation d’une Zephyr — thermopompe murale à Chomedey (Laval)
11 · Frequently asked questions

What people ask us about Zephyr multi-zones.

A multi-zone keeps a single unit outside; wall units are independent, each with its own outdoor unit. For LogisVert, the guide speaks of the complete system in each dwelling: before counting several wall units in one dwelling, we check with Hydro-Québec. We compare both options during the visit.

AirGreen × ZEPHYRMulti-zone: 2 to 5 roomsENERGY STAR cold climateSold and installed by AirGreenMontreal · Laval · Longueuil · South Shore · North Shore
AirGreen · Heating and cooling

Your Zephyr multi-zone, room by room, installed by AirGreen.

We come and see the rooms, choose the outdoor unit and indoor units, validate the combination with TTI and hand you a clear quote.

Book my free estimate514-316-2973

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 commitment
Checked figuresTTI sheets, ENERGY STAR, Hydro-Québec
Showroom1370 Joliot-Curie St., Unit 712, Boucherville

Sources checked October 6 to 9, 2026

  1. ENERGY STAR, Certified Air-Source Heat Pumps (dataset w7cv-9xjt, updated Oct. 8, 2026), checked Oct. 8, 2026: SEER2, EER2, HSPF2, capacities at 47, 17 and 5 °F, COP at 5 °F, cold-climate status, market date, by AHRI number.
  2. TTI, “Zephyr Multi Zone R454b” page (tticlimatisation.com), checked Oct. 8, 2026.
  3. TTI, “MULTIZONE 22 SEER” spec sheet (R-410A, undated), copy hosted on airgreen.ca, checked Oct. 8, 2026.
  4. Hydro-Québec, residential LogisVert participation guide, version 1.10, Sept. 15, 2026 (2026G448F), and eligible heat pump search tool, checked Oct. 6, 2026.
  5. TTI, parts availability policy, version 3.4, July 17, 2026 (ss. 4.3, 4.4 and 6.3: labour during the legal warranty, certified and authorized technician, filter cleaning).
  6. US EPA, SNAP, “Substitutes in Residential and Light Commercial Air Conditioning and Heat Pumps”, updated March 19, 2026 (GWP and ASHRAE classes); ASHRAE refrigerant designations (R-454B = R-32/R-1234yf 68.9/31.1) and Addendum g to Standard 34-2016 (class 2L).
  7. Ozone-depleting Substances and Halocarbon Alternatives Regulations (SOR/2016-137), Schedule 1.1, current to Apr. 28, 2026.
  8. TTI Climatisation Chauffage, home page and FAQ (tticlimatisation.com), checked Oct. 8, 2026.
  9. AirGreen: airgreen.ca product pages and “Nos réalisations” blog, as of Oct. 8, 2026.
  10. Office de la protection du consommateur, warranty of good working order (opc.gouv.qc.ca) and legal warranty notice, checked Oct. 9, 2026; Order in Council 1459-2025, Gazette officielle du Québec (s. 79.21 of the regulation under the Consumer Protection Act, in force Oct. 5, 2026): air conditioner and heat pump, 6 years.
  11. Hydro-Québec, residential LogisVert program page and fraud prevention page (hydroquebec.com), checked Oct. 9, 2026: no telephone or door-to-door solicitation for LogisVert.

LogisVert amounts are indicative: R-454B checked in Hydro-Québec’s tool for the first AHRI number; R-410A and other combinations calculated by AirGreen, to be confirmed by Hydro-Québec.

Prices on quote. Free home estimate.
The ZEPHYR multi-zone shop

The systems, right below.

Each product page matches an outdoor unit and a number of zones. Prices on quote.

ZEPHYR