CANAIR · SERIES 4C28 · R-454BSeries 4C28 at AirGreen5 4C28 wall units, from 9,000 to 33,000 BTU/h, sold and installed by AirGreen in Montreal, Laval, Longueuil, the South Shore and the North Shore.

CanAir · 4C28 wall unit · R-454B · updated October 8, 2026

CanAir 4C28 wall unit: down to -30°C on every size

The 4C28 is CanAir’s wall unit for heating all winter: -30°C from 9,000 to 33,000 BTU/h, R-454B refrigerant, ENERGY STAR cold climate certified. Four sizes have a checked LogisVert amount: $1,440 to $3,840.

See every size Book my free estimate

Series 4C28

Pick a size:

4C28 · 12,000 BTU/h · 230 V

$1,440

Amount on Hydro-Québec’s October 8, 2026 list for this AHRI number (owner, existing home).

Outdoor unit4C28SCH12H21

Indoor unit4C28SEH12H21

AHRI number215449718

Heats down to-30°C

Heating at -15°C11,500 BTU/h

Math (capacity at -8°C)12,000 BTU/h × $120 / 1,000 = $1,440

See the product page

5models, from 9,000 to 33,000 BTU/h

-30°Con every size, per CanAir

24,200BTU/h at -15°C for the 24,000, per CanAir

$3,840checked LogisVert for the 33,000

AirGreen × CANAIRSeries 4C28R-454BDown to -30°C, every sizeENERGY STAR cold climateLogisVert $1,440 to $3,840Sold and installed by AirGreenMontreal · Laval · Longueuil · South Shore · North Shore

AirGreen × CANAIR

The wall unit comes from CanAir. The install is AirGreen.

CanAir supplies the 4C28 and its warranty. AirGreen picks the size with you, installs it and keeps your dates on file.

What the 4C28 brings

Down to -30°COn all five sizes, heating from -30°C to 24°C, per the brochure.
ENERGY STAR cold climateAll five sizes, per ENERGY STAR.
Optional Wi-FiUSB key or wired Wi-Fi controller, per the brochure.
10 years on compressor and partsResidential systems sold since October 5, 2026.

What AirGreen brings

Sold and installed by AirGreenIn Montreal, Laval, Longueuil, the South Shore and the North Shore.
Free home estimateNo obligation. We choose the model and size with you.
LogisVert checkedBy AHRI number, on Hydro-Québec’s current list.
RBQ 5645-9605-01Subclasses 15.8, 15.10 and 16.

The result: the right 4C28 size for your room, installed by AirGreen.

See the sizes Book my free estimate

01 · The sizes

Every 4C28, model by model.

Model numbers, AHRI, efficiency, sound and LogisVert amount. Each amount leads to the product page.

Size	Voltage	Outdoor / indoor	AHRI	SEER2	HSPF2 (region IV)	Heats down to	Indoor sound min.	Max. line length	LogisVert
9,000 BTU/h	230 V	4C28SCH09H21 4C28SEH09H21	215449717	27.4	12.5	-30°C	20.5 dB(A)	82 ft	No amount
12,000 BTU/h	230 V	4C28SCH12H21 4C28SEH12H21	215449718	25.4	10.5	-30°C	22 dB(A)	82 ft	$1,440
18,000 BTU/h	230 V	4C28SCH18H21 4C28SEH18H21	215449719	21.4	11.0	-30°C	31.5 dB(A)	98.4 ft	$2,160
24,000 BTU/h	230 V	4C28SCH24H21 4C28SEH24H21	215449720	21.0	13.5	-30°C	27 dB(A)	164 ft	$2,664
33,000 BTU/h	230 V	4C28SCH33H21 4C28SEH33H21	215449723	19.5	10.5	-30°C	35.5 dB(A)	164 ft	$3,840

SEER2, HSPF2 (region IV), heating ranges, sound levels and line lengths: CanAir brochure. LogisVert: Hydro-Québec’s list of October 8, 2026. AirGreen never changes an AHRI number.

02 · Variable output

The 4C28 12,000 modulates from 3,800 to 14,600 BTU/h in cooling.

A variable-speed heat pump adjusts its output to what the room needs. As long as the load stays above its minimum, it slows down instead of stopping and restarting. Tap a size to see its range, in cooling and heating, per the CanAir 4C28 brochure.

Cooling3,800 – 14,600 BTU/h

min. 3,800rated 12,000max. 14,600

Heating3,800 – 16,000 BTU/h

min. 3,800rated 12,000max. 16,000

3.8×between minimum and maximum in cooling

4.2×between minimum and maximum in heating

Minimum, rated and maximum capacities: CanAir 4C28 brochure, p. 11. The rated capacity is the one on the label; the range shows how far the compressor goes down and up.

03 · The cold

At -15°C, the 4C28 24,000 still gives 24,200 BTU/h.

Heating capacity at -15°C published by CanAir, size by size. And the 4C28 keeps heating down to -30°C.

-20°C

4C28
all sizes · down to -30°C

Within range

C22 and 4C22
for comparison · down to -15°C

Backup needed

Heating capacity at -15°C

9,00011,500 BTU/h

12,00011,500 BTU/h

18,00018,000 BTU/h

24,00024,200 BTU/h

33,00035,000 BTU/h

Source: CanAir brochure, rated heating capacity at -15°C.

04 · Heat per kWh

At -15°C, the 4C28 24,000 gives 2.34 kWh of heat per kWh.

COP compares the heat delivered with the electricity used. An electric baseboard gives 1 kWh of heat per kWh: that is the baseline. Here is the COP of each 4C28 at -15°C, at rated capacity, per the CanAir brochure.

Electric baseboard1.00

4C28 24,0002.34

1 kWhof electricity

2.34 kWhof heat at -15°C

Heat delivered at -15°C24,200 BTU/hbrochure

COP at -15°C (5°F): CanAir 4C28 brochure, p. 11. The electric baseboard is the baseline: all the heat it gives comes from electricity.

05 · LogisVert, Hydro-Québec’s list

From $1,440 to $3,840 for a 4C28.

Amounts from Hydro-Québec’s list of October 8, 2026: $120 per 1,000 BTU/h at -8°C for an ENERGY STAR cold-climate heat pump. Tap a size to see the math.

No LogisVert amount

9,000 BTU/h: below the required 12,000 BTU/h.

4C28 · 33,000 BTU/h

$3,840

LogisVert amount shown by Hydro-Québec, owner, existing home

Models4C28SCH33H21 + 4C28SEH33H21

AHRI number215449723

Capacity at -8°C32,000 BTU/h

Math32,000 BTU/h × $120 / 1,000 = $3,840

Installation date

Apply no later than
—

The LogisVert guide (version 1.10, September 15, 2026) requires an ENERGY STAR certified heat pump, an outdoor unit of at least 12,000 BTU/h and an application within 9 months of installation. The grant never exceeds 100% of the cost before taxes.

06 · Wi-Fi and versions

Optional Wi-Fi, and a 4C28 you identify by its outdoor unit.

Two details the 2026 CanAir brochure spells out, and that we check on every quote.

USB key for Wi-Fi control

Optional. With the NetHome Plus app, you control the unit from your phone, per the CanAir brochure.

Performance Plus or Essential Plus

The brochure also shows a 4C28 “Essential Plus”: same indoor units, but a 4C25 outdoor unit, heating down to -25°C. AirGreen’s 4C28 wall units are Performance Plus, with the 4C28SCH outdoor unit.

4C28 9,000 BTU/h	Performance Plus	Essential Plus
Outdoor unit	4C28SCH09H21	4C25SCH…
Indoor unit	4C28SEH09H21	4C28SEH09H21
Heats down to	-30°C	-25°C
SEER2	27.4	25.8
HSPF2 (IV)	12.5	12.5

4C28 12,000 BTU/h	Performance Plus	Essential Plus
Outdoor unit	4C28SCH12H21	4C25SCH…
Indoor unit	4C28SEH12H21	4C28SEH12H21
Heats down to	-30°C	-25°C
SEER2	25.4	25.5
HSPF2 (IV)	10.5	10.6

4C28 18,000 BTU/h	Performance Plus	Essential Plus
Outdoor unit	4C28SCH18H21	4C25SCH…
Indoor unit	4C28SEH18H21	4C28SEH18H21
Heats down to	-30°C	-25°C
SEER2	21.4	23.5
HSPF2 (IV)	11.0	10.8

4C28 24,000 BTU/h	Performance Plus	Essential Plus
Outdoor unit	4C28SCH24H21	4C25SCH…
Indoor unit	4C28SEH24H21	4C28SEH24H21
Heats down to	-30°C	-25°C
SEER2	21.0	23.0
HSPF2 (IV)	13.5	11.7

Curious detail: at 12,000, 18,000 and 24,000, the Essential Plus shows a higher SEER2. The Performance Plus heats down to -30°C (vs -25°C) and leads on HSPF2 at 18,000 and 24,000; a tie at 9,000, and 10.5 vs 10.6 at 12,000.

CanAir 4C35-28-25 wall heat pump brochure (2026-10-05 version): p. 8 (Wi-Fi and NetHome Plus), Wi-Fi controller page after p. 15 (KJR-120N), p. 11 (Performance Plus) and p. 12 (Essential Plus). AirGreen does not sell the Essential Plus.

07 · Sound

From 20.5 to 53 dB(A) indoors, depending on size and fan speed.

Pick a size, then a fan speed. The needle shows the indoor unit’s sound level published by CanAir; the outdoor unit is shown next to it.

20.5dB(A) · Low

Outdoor unit56 dB(A)

Rule of thumb: 10 dB(A) more is heard as roughly twice as loud. dB(A) is weighted to follow how the ear hears.

Indoor and outdoor sound levels: CanAir 4C28 brochure, p. 11. Lowest figure in the series: 20.5 dB(A) (9,000, low speed).

08 · Line length

Up to 164 ft between the head and the outdoor unit.

Slide the line length and height difference: the tool compares your case with the limits published for each 4C28. Handy for a condo up high or a head upstairs.

Line length25 ftHeight difference between the units10 ft

Maximum length and height, 24.6 ft precharge: CanAir 4C28 brochure, p. 11. Past the precharge, the technician adds refrigerant per the manual. 82 ft, 49.2 ft and 24.6 ft are 25 m, 15 m and 7.5 m.

09 · Refrigerant

R-454B: a GWP of 466, versus 2,088 for R-410A.

The 4C28 uses R-454B, like the 4C22 and 4CDH, the other CanAir series whose name starts with a “4”. Its global warming potential (GWP) is about 4.5 times lower than the R-410A in the C28.

R-410AC22 · C282,088

R-454B4C22 · 4C28 · 4CDH466

÷4.5 lower GWP going from R-410A to R-454B

A2L class

R-454B is rated A2L: low toxicity, mildly flammable. The CanAir 4C22 brochure shows it (“A2L R-454B”, p. 5). It is installed following the rules for that class.

What changes for you

In daily use, nothing: the unit heats and cools the same way. The refrigerant matters mostly for the environment and for the technician who services it.

What GWP means

Global warming potential compares a gas with CO₂ over 100 years. A GWP of 466 means one kilo of R-454B equals 466 kilos of CO₂.

See the C28 series

100-year GWP, IPCC Fourth Assessment Report (AR4) values: R-410A 2,088 (half R-32, half R-125); R-454B 466 (68.9% R-32, 31.1% R-1234yf). Refrigerant per series: CanAir brochures.

10 · The 4 series

The 4C28 among the four wall series.

One family, four roles: two cold limits, two refrigerants.

Series	C22	C28	4C22	4C28
Refrigerant	R-410A	R-410A	R-454B	R-454B
Heats down to	-15°C	-30°C (-15°C for 30,000 and 36,000)	-15°C	-30°C
Sizes at AirGreen	9,000 to 24,000 BTU/h	9,000 to 36,000 BTU/h	9,000 to 18,000 BTU/h	9,000 to 33,000 BTU/h
115 V models	9,000 and 12,000	None	9,000 and 12,000	None
Maximum SEER2	21.7	28.1	21.5	27.4
Wi-Fi	To be confirmed in the quote	To be confirmed in the quote	Optional	Optional (USB key or wired controller)
LogisVert	No verified amount	12,000 to 24,000: $1,200 to $2,544	No verified amount	12,000 to 33,000: $1,440 to $3,840

Temperatures, refrigerant, SEER2 and Wi-Fi: CanAir brochures. Amounts: Hydro-Québec’s list of October 8, 2026.

11 · Who it suits

The 4C28 is the right pick if…

We’ll say it plainly: each series has its own ground.

Good fit

The 4C28 suits you if

you want to heat the room all winter with the wall unit, down to -30°C;
you need a large size in deep cold: the 33,000 gives 35,000 BTU/h at -15°C;
you want LogisVert: $1,440 to $3,840 from 12,000 to 33,000 BTU/h.

Less suited

Look elsewhere for

a 115 V circuit: the 4C28 is 230 V only;
a 9,000 BTU/h with LogisVert: under 12,000 BTU/h, there is no amount.

The R-410A counterpart: the C28

12 · Did you know

7 things to know about the 4C28.

Figures from the CanAir brochures, ENERGY STAR and Hydro-Québec’s list. Scroll through.

Did you know · CanAir13.5

The best HSPF2 of our CanAir wall units

The 4C28 24,000 has the highest heating efficiency of the 22 CanAir wall units at AirGreen (Region IV).

01/07

Did you know · CanAir35,000 BTU/h

At -15°C, more than its size

The 4C28 33,000 gives 35,000 BTU/h at -15°C, and the 24,000, 24,200.

02/07

Did you know · CanAir9.8

The best HSPF2 in Region V

The 4C28 24,000: 9.8 in Region V, the coldest. The highest Region V figure published for our CanAir wall units.

03/07

Did you know · AirGreen5 / 5

Cold climate across the series

All five sizes are ENERGY STAR cold climate certified.

04/07

Did you know · AirGreen$3,840

The largest amount of our CanAir wall units

The 4C28 33,000: 32,000 BTU/h at -8°C × $120 / 1,000.

05/07

Did you know · CanAir4C28SCH

The Performance Plus signature

A 4C28 Essential Plus shares the same indoor units. The outdoor unit is what marks the -30°C version.

06/07

Did you know · CanAirNetHome Plus

The Wi-Fi app

The brochure ties the NetHome Plus app to the 4C28’s Wi-Fi control, offered as an option (USB key or wired controller).

07/07

13 · Glossary

Eight terms to read a 4C28 spec sheet.

Tap a card: the definition, then the series figure.

14 · CanAir warranty

Ten years on the compressor and parts.

The warranty comes from CanAir. The installation and the record of your dates are on us. Keep your maintenance proof: CanAir can ask for it.

10 years

on the compressor and parts, and 6 years on labour, for residential systems sold since October 5, 2026

1 yr2 yr3 yr4 yr5 yr6 yr7 yr8 yr9 yr10 yr

Compressor

10 years

Parts

10 years

Labour

6 years

CanAir base warranty 2026-10-05. Coverage starts at installation. Labour: limited warranty, based on the manufacturer’s table of allowed hours, for a residential installation in Quebec.

Extension

CanAir offers an optional 4-year labour extension, for the original buyer only. We cover it in the quote.

Transfer

The base warranty transfers with the house during the initial term only.

Maintenance

Have the recommended maintenance done and keep your invoices and reports: without proof, coverage can be limited.

15 · Our CanAir projects

4C28 wall units installed in the Montérégie.

Four recent 4C28 installations, each with its article.

Sept. 9, 20264C28 wall unit in Saint-Césaire, Montérégie

Aug. 18, 202624,000 BTU 4C28 wall unit in Saint-Mathias-sur-Richelieu

Aug. 12, 20264C28 wall unit in Saint-Paul-d’Abbotsford

Aug. 6, 20264C28 wall unit in Sainte-Angèle-de-Monnoir

All our projects

16 · Frequently asked questions

What people ask us about the 4C28.

Down to -30°C on all five sizes, per the CanAir brochure (heating range -30°C to 24°C).

17 · Our check

The 4C28 page, checked line by line on October 8, 2026.

What we checked for this page, and where. LogisVert amounts remain indicative: Hydro-Québec confirms them when you apply.

5 AHRI numbers checked against the LogisVert listHydro-Québec file of Oct. 8, 2026: 4 with an amount.
5 AHRI numbers searched in ENERGY STAR5 certified, all cold climate (Oct. 8, 2026).
Every technical figureCanAir 4C35-28-25 wall brochure (2026-10-05 version), pp. 8, 11 and 12.
The warrantyCanAir base warranty 2026-10-05 and 4-year extended labour warranty.
5 product pagesEvery link on this page leads to the right airgreen.ca page.

AirGreen · Air conditioning & heating

Your 4C28, picked for your room and installed by AirGreen.

We come and see the room, choose the size with you, and give you a clear quote with the AHRI number and the estimated LogisVert amount.

Book my free estimate 514 316-2973

Hydro-Québec never solicits 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, on Hydro-Québec’s list

Showroom1370 rue Joliot-Curie, Unit 712, Boucherville

Sources checked on October 8, 2026

CanAir Ductless Split Systems 4C35/4C28/4C25 brochure (version 2026-10-05), 4C28 table, p. 11.
CanAir base warranty 2026-10-05 (consumer) and 4-year extended labour warranty 2026-10-05.
ENERGY STAR, Certified Air-Source Heat Pumps, dataset w7cv-9xjt, checked Oct. 8, 2026.
Hydro-Québec, LogisVert residential participation guide, version 1.10, Sept. 15, 2026.
Hydro-Québec, LogisVert eligible heat pump list, owner, existing home: Oct. 8, 2026 file read by the search tool; 64 CanAir AHRI numbers checked.
airgreen.ca product pages and “Nos réalisations” blog, Oct. 8, 2026.
IPCC Fourth Assessment Report (AR4): 100-year global warming potential of R-410A (2,088) and R-454B (466).
Same brochure, p. 8 (Wi-Fi, NetHome Plus, KJR-120N controller) and p. 12 (4C28 Essential Plus).

LogisVert amounts are estimates: Hydro-Québec confirms them when you apply. Price on quotation.

Price on quotation. Free in-home estimate.

The CANAIR shop · 4C28

All five 4C28 wall units, right below.

Compare the product pages: AHRI number, efficiency and LogisVert amount on each product.

Language

CanAir 4C28 wall unit: down to -30°C on every size

4C28 · 9,000 BTU/h · 230 V

4C28 · 12,000 BTU/h · 230 V

4C28 · 18,000 BTU/h · 230 V

4C28 · 24,000 BTU/h · 230 V

4C28 · 33,000 BTU/h · 230 V

The wall unit comes from CanAir. The install is AirGreen.

What the 4C28 brings

What AirGreen brings

Every 4C28, model by model.

The 4C28 12,000 modulates from 3,800 to 14,600 BTU/h in cooling.

At -15°C, the 4C28 24,000 still gives 24,200 BTU/h.

Heating capacity at -15°C

At -15°C, the 4C28 24,000 gives 2.34 kWh of heat per kWh.

From $1,440 to $3,840 for a 4C28.

Optional Wi-Fi, and a 4C28 you identify by its outdoor unit.

USB key for Wi-Fi control

KJR-120N wired Wi-Fi controller

Performance Plus or Essential Plus

From 20.5 to 53 dB(A) indoors, depending on size and fan speed.

Up to 164 ft between the head and the outdoor unit.

R-454B: a GWP of 466, versus 2,088 for R-410A.

The 4C28 among the four wall series.

Series C22

Series C28

Series 4C22

Series 4C28

The 4C28 is the right pick if…

The 4C28 suits you if

Look elsewhere for

7 things to know about the 4C28.

The best HSPF2 of our CanAir wall units

At -15°C, more than its size

The best HSPF2 in Region V

Cold climate across the series

The largest amount of our CanAir wall units

The Performance Plus signature

The Wi-Fi app

Eight terms to read a 4C28 spec sheet.

Ten years on the compressor and parts.

4C28 wall units installed in the Montérégie.

What people ask us about the 4C28.

The 4C28 page, checked line by line on October 8, 2026.

Your 4C28, picked for your room and installed by AirGreen.

Sources checked on October 8, 2026

All five 4C28 wall units, right below.

CANAIR 4C28 Wall-Mounted Heat Pump | 33,000 BTU - R454B | Montreal, South Shore, North Shore

CANAIR 4C28 Wall-Mounted Heat Pump | 24,000 BTU - R454B | Montreal, South Shore, North Shore

CANAIR 4C28 Wall-Mounted Heat Pump | 18,000 BTU - R454B | Montreal, South Shore, North Shore

CANAIR 4C28 Wall-Mounted Heat Pump | 12,000 BTU - R454B | Montreal, South Shore, North Shore

CANAIR 4C28 Wall-Mounted Heat Pump | 9,000 BTU - R454B | Montreal, South Shore, North Shore