CANAIR 4C28 Heat Pump - R454B | 3-Zone - 48,000 BTU Outdoor
The CanAir 4C28 R454B 48 000 multi-zone heat pump heats and cools 3 rooms with a single outdoor unit. it delivers 45,000 BTU/h at −8 °C, heats down to −30 °C and qualifies for a $5,400 LogisVert grant. Installed by AirGreen in Montréal, Laval, Longueuil, the North Shore and the South Shore.
3 rooms, one outdoor unit.
Compared with the 82 multi-zone systems of 48,000 BTU we sell. Every number on this page carries its source.
The parts that make a multi-zone system.
Tap a part to learn more.
Outdoor unit
One compressor for the whole house. It supplies up to 6 heads and modulates from 13,000 to 45,000 BTU/h depending on what the rooms call for (NEEP).
Base pan heater
A heater keeps the outdoor unit’s base pan free of ice below 1 °C and during defrost (NEEP).
Refrigerant lines
One pair of lines per head.
Indoor heads
One head per room, each with its own remote and temperature. The combination is chosen in the “Zones” menu.
Control
Each zone is set separately.
Turn rooms on and off. Watch the power being shared.
One outdoor unit supplies every head: when several rooms call at once, they share its capacity. Pick an outdoor temperature.
Tell us your rooms. We tell you if this size is enough.
Pick the number of rooms and their size. The estimate targets a −15 °C day; it is a guide, the real calculation is done room by room at your home.
The whole series at a glance: find the box that fits you.
Each box is a product: the outdoor unit’s size, and the number of heads.
At −15 °C, it still delivers 97 % of its rated capacity.
Tap a temperature: certified capacity, efficiency and the cost of one hour of heating.
It slows down, it speeds up: the certified modulation range
Light bar: from minimum to maximum capacity. Dark mark: the rated value.
At every temperature, cheaper than baseboards.
Cost of one hour at full output, for the same heat delivered. Hydro-Québec Rate D, second tier: 11.142 ¢/kWh.
The official ratings, on the same scales as before.
SEER2, HSPF2 and EER2 come from the AHRI certification. The mark shows the median of the same-size multi-zone systems we sell.
A grant you can calculate, not guess.
The capacity at −8 °C comes from Hydro-Québec’s list of October 1, 2026. $120 per 1,000 BTU/h is the rate for ENERGY STAR cold-climate heat pumps (guide v1.10).
Where it ranks among same-size multi-zone systems.
Compared with the 82 multi-zone systems of 48,000 BTU we sell, using the LogisVert list figures. Weaknesses too, said plainly.
Against three other brands in its class.
Same rated size, other manufacturers. Pick the opponent.
One multi-zone or several wall units? Both sides, honestly.
We compare both options on your floor plan during the estimate.
What to know before installing a multi-zone system.
Dimensions, wiring and lines, drawn. Then our six steps.
The outdoor unit, dimensioned
One circuit for the whole house
Published sound levels, on one scale.
We use the outdoor figure to choose where the unit goes.
What is particular about this machine.
Only facts published by ENERGY STAR, NEEP or the manufacturer.
Every number, and where it comes from.
Each line carries its source; a line with no published value is not shown.
The manufacturer’s documentation, as PDF.
Everything we have written about this system.
One outdoor unit for 3 rooms, even at -30°C
The CANAIR 4C28 48,000 BTU outdoor unit (4C28MC648H21) supplies up to 6 indoor units. This listing is for a 3-zone setup: each room has its own wall unit and its own temperature setting, with a single unit outside. It uses R-454B refrigerant (global warming potential of 466, compared with 2,088 for R-410A) and keeps heating down to -30°C.
The CANAIR brand is distributed in Quebec by Descair, a Quebec family business founded in 1971, which means local supply and local support.
What kind of home is it for?
This setup suits three rooms handled separately, for example the living room, the main bedroom and an office, in a bungalow or a condo. The outdoor unit’s capacity (48,000 BTU) is shared among the indoor units, chosen from the compatible 4C28 wall models.
The right choice depends on room sizes, insulation and where the units go. We confirm it with you during the free on-site assessment.
Performance in deep cold
According to NEEP, for this combination (AHRI 215449733):
Heating at -8°C: 45,000 BTU/h (COP 2.6)
Heating at -15°C: 47,000 BTU/h (COP 2.0)
Maximum capacity at -30°C: 24,600 BTU/h (COP 1.27)
It is ENERGY STAR® cold climate certified (certification no. 3712093).
Specifications
| Outdoor unit | 4C28MC648H21 |
| Zones | 3 in this setup, up to 6 |
| Compatible indoor units | 4C28SEH06H21, 4C28SEH09H21, 4C28SEH12H21, 4C28SEH18H21, 4C28SEH24H21, 4C28SEH33H21 |
| SEER2 / HSPF2 / EER2 | 23.0 / 11.0 / 12.0 |
| Refrigerant | R-454B (A2L) |
| Voltage | 220 V |
| MCA / MOP | 37 A / 40 A |
| Line set | 1/4 - 3/8 in |
| Outdoor sound level | 65.0 dB(A) |
| Outdoor dimensions | 37.48 x 16.34 x 52.48 in |
| Wi-Fi | Optional |
| Warranty | 10 years compressor, 10 years parts, 6 years labour |
Features designed for everyday life
Inverter technology: the compressor adjusts its speed to demand, for a steady temperature and lower energy use.
Turbo mode to reach the desired temperature quickly.
Silent mode: the 4C28 wall units go as low as 19.5 dB(A).
“Follow Me” function: the remote measures the temperature where you are.
Self-cleaning and cold-draft prevention when heating starts.
Automatic restart after a power outage.
Heating cables in the base and around the compressor, against ice in winter.
Refrigerant leak detection (A2L) for safety.
Hydro-Québec LogisVert aid
This combination (AHRI 215449733) is on Hydro-Québec’s LogisVert list of October 27, 2026, with an indicative amount of $5,400. The amount depends on the indoor units installed and the program’s conditions; only Hydro-Québec confirms the aid granted.
Installation by AirGreen
Free on-site assessment, with no obligation;
Transparent prices, confirmed before the work;
Experienced refrigeration technicians, under AirGreen’s RBQ licence 5645-9605-01;
Manufacturer warranty registration, done for you.
We install throughout Montreal, Laval, Longueuil, the North Shore and the South Shore. To see installations completed by our teams, visit our Our projects page.
For your free estimate: 514-316-2973 or sales@airgreen.ca.
Warranty: 10 years on the compressor, 10 years on parts and 6 years on labour, directly from the distributor.
What people ask us about multi-zone systems.
Can I heat one room and cool another at the same time?
No. On a multi-zone system like this one, every head works in the same mode, heating or cooling. Each room still keeps its own set temperature.
What happens when every room calls for heat?
They share the outdoor unit’s capacity: 45,000 BTU/h at −8 °C, 47,000 at −15 °C and 24,600 at −30 °C.
How many heads can I connect?
Up to 6 on this outdoor unit. This product is configured for 3 heads.
Can I mix head sizes?
Yes. The “Zones” menu offers 35 combinations, from 6+6+18 to 18+18+18 (in thousands of BTU). Each head is sized for its room.
How much is the LogisVert grant?
$5,400 according to Hydro-Québec’s list of October 1, 2026. The grant never exceeds 100 % of the cost before taxes; apply within 9 months of installation.
Is it ENERGY STAR certified?
Yes, cold climate, ID 3712093. It also meets the ENERGY STAR Most Efficient criteria, according to the ENERGY STAR database.
Down to what temperature does it heat?
Down to −30 °C. At −30 °C, it still delivers 24,600 BTU/h with a COP of 1.27.
Is it noisy?
Indoors, the reference head goes down to 19.5 dB(A). Outdoors, 65 dB(A): we place the unit away from bedroom windows.
Why a multi-zone instead of several wall units?
One outdoor unit on the wall and one circuit. In return, the rooms share the capacity, and if the outdoor unit stops, every zone stops.
What does the warranty cover?
Our sheet lists 10 years on the compressor and 10 years on parts. AirGreen extended warranty: possible.
A multi-zone system is planned room by room. At your home.
We measure every room, draw the line route and choose the right head for each zone. The on-site estimate is free and the quote arrives within 24 h.