FORESTAIR MZ R454B 2-Zone Wall-Mounted Heat Pump | Outdoor: 36000 BTU
The ForestAir MZ R454B 36 000 multi-zone heat pump heats and cools 2 rooms with a single outdoor unit. it delivers 27,400 BTU/h at −8 °C, heats down to −25 °C and qualifies for a $3,288 LogisVert grant. Installed by AirGreen in Montréal, Laval, Longueuil, the North Shore and the South Shore.
2 rooms, one outdoor unit.
Compared with the 141 multi-zone systems of 36,000 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 4 heads and modulates from 5,500 to 27,500 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, also from your phone.
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 72 % 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 141 multi-zone systems of 36,000 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.
A high-performance multi-zone solution designed for Quebec's climate
At AirGreen, we regularly install multi-zone systems in residences in Montreal, Laval, Longueuil, on the North Shore, and the South Shore, and this FORESTAIR MZ R454B 36,000 BTU wall-mounted heat pump clearly stands out in its category. Designed to offer stable performance even during harsh winters, it combines energy efficiency, installation flexibility, and modern technology.
This model directly addresses several frequent concerns of our customers:
- Efficient heating down to -25°C
- Powering multiple rooms with a single outdoor unit
- Reducing energy consumption without compromising comfort
- Benefiting from a solution eligible for LogisVert grants ($3,288)
Understanding the real power of a 36,000 BTU multi-zone heat pump
Capacity and performance in real conditions
The FORESTAIR MZ R454B 36,000 BTU offers high nominal power, but what really matters is its performance in Quebec winter conditions.
- Heating capacity at -8°C: 27,400 BTU
- Capacity at -15°C: 26,000 BTU
- Guaranteed operation down to -25°C
- DC Inverter technology to continuously adjust power
Impressive energy efficiency
- SEER2: 22.5
- HSPF2: 10.0
- COP: 3.5
In concrete terms, this means that for every dollar of electricity consumed, you get much more useful heat compared to traditional systems.
Multi-zone configuration: essential flexibility
Up to 2 zones (expandable to 4)
This system is designed for:
- 2 standard zones
- Up to 4 maximum zones
This allows for air conditioning or heating:
- A duplex
- A condo with several bedrooms
- A multi-story house with distinct zones
Possible combinations of indoor units
Compatible models include:
- 9,000 BTU
- 12,000 BTU
- 18,000 BTU
- 24,000 BTU
At AirGreen, we always adapt the combination according to:
- The actual surface area
- The building's insulation
- Sun exposure
- The specific needs of the occupants
R-454B refrigerant: a transition to more ecological systems
Why this gas is important
The FORESTAIR MZ uses R-454B, a new generation refrigerant:
- Reduced environmental impact (lower GWP)
- Compliance with future standards
- Better thermal efficiency
In a context where standards are rapidly evolving in Canada, choosing a system already aligned with new requirements is a strategic advantage.
HVAC installation: what our teams observe in the field
Real-life example in Longueuil
We recently installed this model in a house in Longueuil:
Initial situation:
- Inefficient electric heating
- Poor heat distribution between floors
Solution:
- Installation of a FORESTAIR 36,000 BTU multi-zone heat pump
- 2 wall-mounted units (12,000 + 18,000 BTU)
Result:
- Uniform temperature throughout the house
- Significant reduction in energy costs
- Remarkable silence indoors (30-46 dB)
Essential technical details to know
Electrical data
- Voltage: 220V
- MCA: 22A
- Max Breaker (MOP): 35A
Piping and installation
- Liquid line: 1/4 inch
- Gas line: 3/8 inch
- Maximum total length: 80 m (263 feet)
- Length per zone: 30 m (98 feet)
These characteristics offer great installation flexibility, particularly in existing homes where architectural constraints are frequent.
Dimensions and noise
- Outdoor dimensions: 42.25 x 18.38 x 33.63 inches
- Outdoor sound level: 65 dB(A)
What we learned with this model (AirGreen field feedback)
Observed strengths
- Relatively quick installation compared to other multi-zone systems
- Very good performance stability in winter
- Simple WiFi interface for users
- Few service calls after installation
Mistakes to avoid
- Undersizing indoor units
- Neglecting the location of the outdoor unit (sound and performance impact)
- Not planning drainage correctly
At AirGreen, we always insist on a complete thermal analysis before installation.
Grants and return on investment
LogisVert grant
- Amount: $3,288
- Applicable for this ENERGY STAR® (cold climate) certified model
Real financial impact
In several projects in Laval and Montreal, our clients observe:
- 30 to 50% reduction in heating costs
- Return on investment between 3 and 6 years
Why choose AirGreen for your HVAC installation
Real field expertise
We don't just sell systems. We:
- Daily install multi-zone heat pumps
- Solve complex renovation cases
- Optimize each installation for the local climate
Concrete advantages
- Transparent prices (no surprises)
- Certified and experienced technicians
- 5M$ liability insurance
- Personalized advice tailored to your home
Conclusion: a reliable and strategic multi-zone heat pump
The FORESTAIR MZ R454B 36,000 BTU 2-zone wall-mounted heat pump represents a solid solution for homeowners looking to:
- Maximize their comfort
- Reduce their energy costs
- Adapt their system to multiple zones
- Comply with new environmental standards
At AirGreen, we recommend this model for residential projects requiring a flexible, high-performance, and sustainable solution.
Take action with AirGreen
Are you considering an HVAC installation in Montreal, Laval, Longueuil, on the North Shore, or the South Shore?
Contact us today for:
- A detailed quote
- A personalized analysis of your property
- Expert advice tailored to your situation
Warranty: 10 years on the compressor, 10 years on parts and 6 years on labor, straight 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: 27,400 BTU/h at −8 °C, 26,000 at −15 °C.
How many heads can I connect?
Up to 4 on this outdoor unit. This product is configured for 2 heads.
How much is the LogisVert grant?
$3,288 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 4529625. It also meets the ENERGY STAR Most Efficient criteria, according to the ENERGY STAR database.
Down to what temperature does it heat?
Down to −25 °C.
Is it noisy?
Indoors, the reference head goes down to 30 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.