FORESTAIR MZ R454B 2-Zone Wall-Mounted Heat Pump | Ext: 18000 BTU
The ForestAir MZ R454B 18 000 multi-zone heat pump heats and cools 2 rooms with a single outdoor unit. it delivers 20,000 BTU/h at −8 °C, heats down to −25 °C and qualifies for a $2,400 LogisVert grant. Installed by AirGreen in Montréal, Laval, Longueuil, the North Shore and the South Shore.
2 rooms, one outdoor unit.
Compared with the 48 multi-zone systems of 18,000 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 2 heads and modulates from 3,500 to 20,000 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, 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 88 % 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 48 multi-zone systems of 18,000 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 Dual-Zone HVAC Solution Adapted to Quebec's Climate Realities
At AirGreen, we daily install HVAC systems in Montreal, Laval, Longueuil, on the North Shore and the South Shore, and we're seeing a clear trend: clients are looking for reliable multi-zone systems that are efficient in winter and flexible for different spaces. The FORESTAIR MZ R454B 18,000 BTU 2-zone wall-mounted heat pump precisely meets these requirements.
This model stands out for its ability to serve two independent zones, while maintaining consistent performance even during periods of intense cold, an essential factor in our Quebec climate.
Why choose a dual-zone heat pump like the FORESTAIR MZ 18,000 BTU
Smart management of two distinct spaces
In several projects carried out by AirGreen, particularly in Boucherville and Laval, we have installed this type of system in typical configurations:
- A living room on the ground floor + a bedroom upstairs
- A main dwelling + a finished basement
- A duplex with distinct zones
Thanks to its 2 independent zones, this heat pump allows for:
- An individual temperature control
- An optimization of energy consumption
- Personalized comfort for each occupant
Heating performance down to -25°C: a non-negotiable criterion
One of the most important elements for an HVAC installation in Quebec is heating capacity in winter. This model offers effective heating capacity down to -25°C, making it a solid choice for:
- Single-family homes in Longueuil
- Plexes in Montreal
- Wind-exposed properties on the North Shore
According to the manufacturer's technical data, the unit can reach:
- 20,000 BTU at 8°C
- 16,000 BTU at -15°C
These performances significantly reduce the use of auxiliary heating, which means real savings for our clients.
Advanced technology and energy efficiency
High-efficiency DC Inverter
DC Inverter technology adjusts compressor power in real-time, thus avoiding energy-intensive on/off cycles.
Specifically, this means:
- Stable temperature
- Less wear and tear on components
- Better overall efficiency
The measured performances are particularly interesting:
- SEER2: 24.0
- HSPF2: 10.5
- EER2: 13.0
These values position this system among the high-performance energy-efficient options available on the Quebec market.
R-454B Refrigerant: a more responsible choice
The FORESTAIR MZ uses R-454B gas, a new generation refrigerant:
- Less environmental impact than R-410A
- Compliant with new standards
- Better thermal efficiency
At AirGreen, we increasingly recommend this type of system, especially for clients concerned about energy efficiency and available subsidies.
Essential technical data to know
Here are the key elements to consider before installation:
Main features
- Cooling capacity: 18,000 BTU
- 2 zones (maximum 2 indoor units)
- Voltage: 220V
- Outdoor sound level: 58 dB(A)
- WiFi included
Dimensions and installation
- Outdoor unit: 36.5 x 15 x 27.5 inches
- Weight: approximately 42 kg
According to the technical sheet, installation parameters include:
- Maximum refrigerant line length: 40 m (131 feet)
- Maximum length per zone: 25 m (82 feet)
- Maximum elevation: 10 m (33 feet)
This data is crucial when planning, especially for complex installations such as:
- Multi-story homes
- Properties with architectural constraints
- Renovation installations
Real experience: installation in Laval in a duplex
We recently installed this model in a duplex in Laval, where the client wanted to:
- Air condition the main living room
- Heat an upstairs bedroom
Challenges encountered:
- Significant distance between units
- Duct passage through a load-bearing wall
- Minimizing noise for a family environment
Result:
- Uniform comfort in both zones
- Reduced energy consumption
- No perceptible noise in the rooms
This type of project perfectly illustrates the versatility of this dual-zone wall-mounted heat pump.
Common mistakes to avoid with a multi-zone heat pump
At AirGreen, we have seen several poorly designed installations (often carried out without specialized HVAC expertise). Here are the mistakes to avoid:
Incorrect sizing
An 18,000 BTU system must be adapted to the surface area and insulation. Too small:
- Lack of performance in winter
- Overconsumption
Too large:
- Short cycles
- Premature wear
Poor zone distribution
Installing two poorly positioned zones leads to:
- Poor air circulation
- Thermal discomfort
- Overall inefficiency
Non-compliant installation
Improper connection or incomplete vacuuming can compromise:
- Compressor lifespan
- Energy efficiency
- Warranty
Subsidy and profitability in Quebec
This model is eligible for the LogisVert subsidy of $2400, making it a financially attractive option.
In several cases analyzed at AirGreen:
- Return on investment in 3 to 5 years
- Significant reduction in heating costs
Why choose AirGreen for your HVAC installation
Field expertise
Our refrigeration technicians install similar systems every week in:
- Montreal
- Laval
- Longueuil
- North Shore and South Shore
We master:
- The constraints of Quebec buildings
- Electrical standards (MCA 16A / MOP 25A)
- Optimizing winter performance
Complete and transparent installation
Each project includes:
- Complete thermal analysis
- Precise sizing
- Compliant installation
- Professional commissioning
No surprises at the end of the project.
Real after-sales service
Unlike several market players, we provide:
- Fast support
- HVAC maintenance
- Advanced diagnostics
Conclusion: a balanced, efficient, and Quebec-adapted dual-zone heat pump
The FORESTAIR MZ R454B 18,000 BTU 2-zone wall-mounted heat pump represents a reliable solution for homeowners who want to:
- Heat efficiently in winter
- Air condition two distinct zones
- Optimize their energy consumption
It combines:
- Performance
- Flexibility
- Compliance with new environmental standards
Contact AirGreen for a personalized quote
For an HVAC installation in Montreal, Laval, Longueuil, on the North Shore or the South Shore, our team supports you every step of the way.
Contact us today for:
- A free evaluation
- A recommendation adapted to your property
- Professional installation without compromise
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: 20,000 BTU/h at −8 °C, 16,000 at −15 °C.
How many heads can I connect?
Up to 2 on this outdoor unit. This product is configured for 2 heads.
How much is the LogisVert grant?
$2,400 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 4529624. 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, 58 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.