CANAIR · 4CDH · R-454B · 1.5–5 TThe CANAIR 4CDH central system at AirGreenSix sizes, from 1.5 to 5 tons, sold and installed by AirGreen in Montreal, Laval, Longueuil, the South Shore and the North Shore.
CanAir · 4CDH central heat pump · updated October 8, 2026
CanAir 4CDH central: the whole house, through your ducts, down to -30°C
The 4CDH replaces your electric furnace with a complete system: the side-discharge outdoor unit and the 4CDH indoor unit, with optional 5 to 25 kW electric elements. R-454B refrigerant, heating down to -30°C, wired Wi-Fi controller included, checked LogisVert from $1,800 to $5,400.
AirGreen × CANAIR4CDH centralR-454B1.5 to 5 tonsDown to -30°CWired Wi-Fi controller included10 years on compressor and partsMontreal · Laval · Longueuil · South Shore · North Shore
AirGreen × CANAIR4CDH centralR-454B1.5 to 5 tonsDown to -30°CWired Wi-Fi controller included10 years on compressor and partsMontreal · Laval · Longueuil · South Shore · North Shore
The outdoor unit draws heat from outside, even in deep cold. The indoor unit blows it through your ducts. The electric elements top up when needed.
1
The 4CDH outdoor unit
Side discharge, R-454B. It draws heat from outside and heats down to -30°C, per CanAir.
2
The 4CDH indoor unit
Multi-position (up, down, left, right), constant-airflow ECM motor. It blows the heat through your ducts; the optional electric elements top up when needed.
3
The wired Wi-Fi controller
Included with the central system, per the brochure. The board also accepts a 24 V thermostat.
02 · How the air moves
Winter or summer, the same path through your ducts.
Switch between heating and cooling: the drawing shows where the heat goes. The numbers follow the steps on the right.
Outside, the 4CDH unit pulls heat from the airEven in deep cold: its heating range goes down to -30°C, per CanAir. CanAir presents the 4CDH as a side-discharge system: the cooled air leaves through the side.
The refrigerant carries the heatTwo copper lines link the two units. The R-454B refrigerant makes the round trip.
The indoor unit blows it into your ductsIts coil passes the heat to the air, and the ECM motor pushes that air through the ducts. The optional electric elements top up when needed.
Warm air reaches every roomThrough your duct registers, as with a furnace.
Air comes back through the return grillesIt goes back through the indoor unit, and the cycle starts again.
Outside, the 4CDH unit rejects the heatIn cooling, the cycle reverses: the heat removed from the house goes outside. Cooling range: up to 50°C, per CanAir.
The refrigerant carries the heatIn the other direction: from inside to outside.
The indoor coil cools the airThe fan pushes the cool, dried air through your ducts.
Cool air reaches every roomThrough the same registers as in winter.
Air comes back through the return grillesIt goes back over the coil, and the cycle starts again.
Operating ranges, side discharge, ECM motor and optional elements: CanAir 4CDH brochure (July 18, 2025 revision). Simplified drawing: your duct layout is surveyed at the visit.
03 · Central, furnace or add-on
It all depends on the furnace you have today.
Pick your current furnace: we show you the CanAir system that fits.
Your current furnace
Two paths. The 4CDH central system replaces your furnace: its indoor unit has its own electric elements. The add-on keeps your furnace and adds a CanAir coil to it. We compare both at the visit.
The add-on. It keeps your furnace and adds a CanAir coil: the heat pump heats, the furnace takes over when needed. We install the heat pump and the coil; we don’t touch the burner or the gas or oil supply.
Capacity at -8°C (the 17°F point LogisVert uses) and SEER2: ENERGY STAR, Oct. 8, 2026. HSPF2 (region IV) and heating at -15°C: CanAir 4CDH brochure, same values as ENERGY STAR. In cooling, the 2-ton is 23,000 BTU/h and the 5-ton 54,000 BTU/h, per the brochure. The two heating points are not measured under the same conditions: the -15°C value can be higher than the -8°C one.
05 · The ton
One ton is 12,000 BTU/h: the ice that melts in a day.
Central systems are sold in tons. Here is where the unit comes from, and what each 4CDH really delivers.
2,000 lb × 144 BTU/lb ÷ 24 h = 12,000 BTU/h
The word comes from ice: melting one short ton of ice (2,000 lb) in 24 hours absorbs 12,000 BTU per hour. A “3-ton heat pump” therefore moves, in theory, 36,000 BTU/h.
Compare with the real figures of each 4CDH:
In theory18,000 BTU/h1.5 tons × 12,000
Rated cooling18,000 BTU/h4CDH2018C21
Rated heating19,000 BTU/hCanAir brochure
In theory24,000 BTU/h2 tons × 12,000
Rated cooling23,000 BTU/h4CDH2024C21
Rated heating24,000 BTU/hCanAir brochure
In theory30,000 BTU/h2.5 tons × 12,000
Rated cooling30,000 BTU/h4CDH2030C21
Rated heating34,000 BTU/hCanAir brochure
In theory36,000 BTU/h3 tons × 12,000
Rated cooling36,000 BTU/h4CDH2036C21
Rated heating37,000 BTU/hCanAir brochure
In theory48,000 BTU/h4 tons × 12,000
Rated cooling48,000 BTU/h4CDH2048C21
Rated heating50,000 BTU/hCanAir brochure
In theory60,000 BTU/h5 tons × 12,000
Rated cooling54,000 BTU/h4CDH2060C21
Rated heating56,000 BTU/hCanAir brochure
Heat of fusion of ice: 144 BTU per pound. Rated capacities: CanAir 4CDH brochure (July 18, 2025 revision). The 2-ton cools at 23,000 BTU/h and the 5-ton at 54,000: tons are a size class, not an exact measurement.
06 · At -15°C
At -15°C, the 3-ton gives 39,000 BTU/h: more than its rated output.
Rated heating capacity is measured in mild weather. Here is what each 4CDH keeps at -15°C, and its COP at that temperature.
Rated19,000 BTU/h
-15°C18,000 BTU/h
At -15°C, the 1.5-ton keeps 94.7% of its rated heating capacity.
1 kWhof electricity
2.00 kWhof heat at -15°C
Rated24,000 BTU/h
-15°C21,600 BTU/h
At -15°C, the 2-ton keeps 90% of its rated heating capacity.
1 kWhof electricity
1.87 kWhof heat at -15°C
Rated34,000 BTU/h
-15°C32,600 BTU/h
At -15°C, the 2.5-ton keeps 95.9% of its rated heating capacity.
1 kWhof electricity
1.96 kWhof heat at -15°C
Rated37,000 BTU/h
-15°C39,000 BTU/h
At -15°C, the 3-ton gives 39,000 BTU/h, more than its rated heating capacity.
1 kWhof electricity
1.90 kWhof heat at -15°C
Rated50,000 BTU/h
-15°C46,000 BTU/h
At -15°C, the 4-ton keeps 92% of its rated heating capacity.
1 kWhof electricity
1.90 kWhof heat at -15°C
Rated56,000 BTU/h
-15°C52,000 BTU/h
At -15°C, the 5-ton keeps 92.9% of its rated heating capacity.
1 kWhof electricity
1.80 kWhof heat at -15°C
Rated heating capacity, capacity at -15°C and COP at -15°C: CanAir 4CDH brochure (July 18, 2025 revision), outdoor unit tables.
07 · LogisVert, Hydro-Québec’s list
From $1,800 to $5,400 for a 4CDH central system.
Amounts from Hydro-Québec’s list of October 8, 2026: $120 per 1,000 BTU/h at -8°C, ENERGY STAR cold-climate system. The “electric furnace” page carries the same AHRI number: one amount per system.
4CDH central · 5 tons
$5,400
LogisVert amount shown by Hydro-Québec, owner, existing home
Models4CDH2060C21 + 4CDH2060F21
AHRI number215449709
Capacity at -8°C45,000 BTU/h
Math45,000 BTU/h × $120 / 1,000 = $5,400
4CDH central · 4 tons
$4,740
LogisVert amount shown by Hydro-Québec, owner, existing home
Models4CDH2048C21 + 4CDH2048F21
AHRI number215449708
Capacity at -8°C39,500 BTU/h
Math39,500 BTU/h × $120 / 1,000 = $4,740
4CDH central · 3 tons
$3,816
LogisVert amount shown by Hydro-Québec, owner, existing home
Models4CDH2036C21 + 4CDH2036F21
AHRI number215449707
Capacity at -8°C31,800 BTU/h
Math31,800 BTU/h × $120 / 1,000 = $3,816
4CDH central · 2.5 tons
$2,856
LogisVert amount shown by Hydro-Québec, owner, existing home
Models4CDH2030C21 + 4CDH2030F21
AHRI number215449706
Capacity at -8°C23,800 BTU/h
Math23,800 BTU/h × $120 / 1,000 = $2,856
4CDH central · 2 tons
$2,496
LogisVert amount shown by Hydro-Québec, owner, existing home
Models4CDH2024C21 + 4CDH2024F21
AHRI number215449705
Capacity at -8°C20,800 BTU/h
Math20,800 BTU/h × $120 / 1,000 = $2,496
4CDH central · 1.5 tons
$1,800
LogisVert amount shown by Hydro-Québec, owner, existing home
Models4CDH2018C21 + 4CDH2018F21
AHRI number215449704
Capacity at -8°C15,000 BTU/h
Math15,000 BTU/h × $120 / 1,000 = $1,800
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.
08 · Line length
Up to 246 ft of line set between the outdoor unit and the basement.
Slide the length and height difference: the tool compares your case with the limits published for each 4CDH. Handy when the outdoor unit has to sit far from the indoor unit, or on a flat roof.
CanAir 4CDH brochure (July 18, 2025 revision), maximum length and height difference: 98.4 ft and 65.6 ft at 1.5 tons, 164 ft and 82 ft at 2 and 2.5 tons, 246 ft and 98.4 ft from 3 to 5 tons. The real length is measured at the visit.
09 · The right size
The right size is worked out at your home, not off a label.
Tons aren’t picked at random. At the visit, we look at three things.
1
The house’s heat loss
Floor area, windows, insulation and storeys: that’s what sets the heating capacity you need.
2
Your ducts
The indoor unit’s airflow has to get through: from 618 to 1,807 CFM at top speed depending on size, per the brochure.
3
Your electrical panel
The electric elements go up to 25 kW: we check the panel’s capacity. AirGreen holds RBQ subclass 16 (electricity).
10 · Did you know
Eight things to know about the 4CDH central system.
From ice tons to the multi-unit amount. Scroll through.
Did you know · CanAir40 A
Maximum fuse at 4 and 5 tons
20 A at 1.5 and 2 tons, 30 A at 2.5 and 3 tons, per the brochure.
01/08Did you know · CanAir23,000 BTU/h
The 2-ton is not 24,000
In cooling, the 4CDH 2-ton is rated 23,000 BTU/h, and the 5-ton, 54,000.
02/08Did you know · CanAir65 dB(A)
The 4- and 5-ton outdoor unit
From 59 dB(A) at 1.5 tons to 65 dB(A) at 4 and 5 tons, per the brochure.
03/08Did you know · CanAir8.6
Region V HSPF2, the 3-ton
The highest of the 4CDH range in Region V, the coldest (8.0 to 8.6 depending on size).
04/08Did you know · CanAir0.8
Inch of water, without losing airflow
The constant-airflow ECM motor holds up to 0.8 in. of water static pressure.
05/08Did you know · CanAirWi-Fi
Controller included
The 4CDH central system comes with a wired Wi-Fi controller; its board also accepts a 24 V thermostat.
06/08Did you know · AirGreen$9,900
The multi-unit amount
For an electrically heated multi-unit building, LogisVert provides $220 per 1,000 BTU/h at -8°C since June 15, 2026, not combinable with other bonuses. The list then shows $9,900 for the 5-ton.
07/08Did you know · AirGreenSide
Side discharge
CanAir presents the 4CDH as a side-discharge system: in the usual sense, the outdoor unit blows its air out the side, not the top.
08/08
11 · Glossary
Eight terms for central systems.
Tap a card: the definition, then the 4CDH figure.
12 · 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 on parts, for residential CDH and 4CDH systems
1 yr2 yr3 yr4 yr5 yr6 yr7 yr8 yr9 yr10 yr
Compressor
10 years
Parts
10 years
CanAir CDH and 4CDH base warranty (version 2026-02-23) and 2026-10-05 base warranty. Coverage starts at installation.
Labour
Coverage depends on the sale date. We confirm in writing what applies, in the quote.
Transfer
Transferable to the next owner during the initial term only.
Maintenance
Have the recommended maintenance done and keep your invoices and reports.
13 · Our CanAir projects
CanAir central systems installed by AirGreen.
From the South Shore to the Laurentians, and a 4CDH in Rougemont.
The side-discharge 4CDH outdoor unit, the 4CDH indoor unit and a wired Wi-Fi controller, per the CanAir brochure. The 5 to 25 kW electric elements are optional.
Down to -30°C, per the CanAir 4CDH brochure (heating range -30°C to 24°C).
From $1,800 (1.5 tons) to $5,400 (5 tons), per Hydro-Québec’s list of October 8, 2026. Math: capacity at -8°C × $120 per 1,000 BTU/h.
That’s the idea: the 4CDH blows through your existing ducts. At the visit, we check they can carry the airflow of the chosen size.
A 12,000 BTU/h size class, inherited from ice: the heat absorbed each hour when 2,000 lb of ice melts over a day. The 4CDH’s real capacities are in the brochure.
Look at the add-on instead: it keeps your furnace and adds a CanAir coil. We don’t touch the burner or the gas or oil supply.
No hardware difference: the “electric furnace” is the 4CDH indoor unit, sold on its own product page. The LogisVert amount only applies to the complete system (4CDH outdoor and indoor units), under the pair’s AHRI number.
10 years on the compressor and parts for residential use, per the CanAir base warranty. Labour coverage depends on the sale date: we confirm it in writing in the quote.
Yes, under conditions: $220 per 1,000 BTU/h at -8°C since June 15, 2026, with electric main heating, not combinable with other bonuses. We check eligibility with you.
The 4CDH central system, checked on October 8, 2026.
What we checked for this page, and where. LogisVert amounts remain indicative: Hydro-Québec confirms them when you apply.
×
6 AHRI numbers checked against the LogisVert listHydro-Québec file of Oct. 8, 2026: 6 with an amount, $1,800 to $5,400.
6 AHRI numbers searched in ENERGY STAR6 certified, all cold climate (Oct. 8, 2026).
Every technical figureCanAir 4CDH R-454B brochure, July 18, 2025 revision (dealer copy: the 2026 English version could not be read).
The warrantyCanAir base warranty 2026-10-05 and CDH & 4CDH warranty (2026-02-23). Labour confirmed in writing on the quote.
LogisVert guide 1.10Rules: $120 per 1,000 BTU/h at -8°C, 9-month deadline, multi-unit bonus.
AirGreen × CANAIR4CDH centralR-454B1.5 to 5 tonsDown to -30°CWired Wi-Fi controller included10 years on compressor and partsMontreal · Laval · Longueuil · South Shore · North Shore
AirGreen × CANAIR4CDH centralR-454B1.5 to 5 tonsDown to -30°CWired Wi-Fi controller included10 years on compressor and partsMontreal · Laval · Longueuil · South Shore · North Shore
AirGreen · Air conditioning & heating
Your CanAir central system, sized for your house and installed by AirGreen.
We come and see the house, the ducts and the panel, choose the size with you, and give you a clear quote with the AHRI number and the estimated LogisVert amount.
