FORESTAUR MZ R454B 4-Zone Wall-Mounted Heat Pump | Outdoor: 42000 BTU
The ForestAir MZ R454B 42 000 multi-zone heat pump heats and cools 4 rooms with a single outdoor unit. it delivers 31,000 BTU/h at −8 °C, heats down to −25 °C and qualifies for a $3,720 LogisVert grant. Installed by AirGreen in Montréal, Laval, Longueuil, the North Shore and the South Shore.
4 rooms, one outdoor unit.
Compared with the 86 multi-zone systems of 42,000 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 5 heads and modulates from 6,500 to 32,000 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 71 % 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 86 multi-zone systems of 42,000 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 HVAC Solution Designed for Quebec's Climate
In the demanding climate context of Montreal, Laval, Longueuil, the North Shore, and the South Shore, choosing a reliable and high-performance multi-zone heat pump is a strategic decision. At AirGreen, we regularly install the FORESTAIR MZ R454B 42,000 BTU 4-zone wall-mounted heat pump, a system that stands out for its balance of energy efficiency, installation flexibility, and heating performance down to -25°C.
This model is particularly aimed at owners of single-family homes, duplexes, or triplexes who wish to supply several rooms with a single outdoor unit, while maintaining individual control per zone.
An Ideal 4-Zone Configuration for Modern Residences
Maximum Flexibility for Your Comfort
The quad zone (4 zones) configuration allows connecting up to 4 indoor wall-mounted units, with a maximum capacity that can go up to 5 zones depending on the configuration.
Concretely, this means:
- One unit for the living room
- One for the master bedroom
- One for secondary bedrooms or office
- One for the basement or additional living space
Each zone can be controlled independently, which optimizes comfort and reduces unnecessary energy consumption.
Concrete Example of AirGreen Installation
During a recent project in Boucherville (South Shore), our client wanted to air condition and heat:
- An open-plan living room
- Three bedrooms upstairs
We installed a FORESTAIR 42,000 BTU multi-zone, combined with:
- 1 x 18,000 BTU unit
- 2 x 9,000 BTU units
- 1 x 12,000 BTU unit
Result:
- Significant reduction in energy costs
- Uniform comfort in all rooms
- No perceptible noise in the bedrooms
Energy Performance and Advanced Technology
High-Efficiency Inverter DC Technology
Inverter DC technology continuously adjusts the compressor's power, unlike traditional systems that operate in on/off cycles.
Concrete advantages:
- Lower electricity consumption
- Stable temperature
- Less wear and tear on components
Impressive Energy Efficiency
According to technical data:
- SEER2: 22.0
- EER2: 11.2
- HSPF2: 10.0
- COP: 3.50
These values demonstrate excellent efficiency, particularly important in a context where electricity costs are rising.
LogisVert Subsidy
This heat pump is eligible for a subsidy of up to $3720, making it a very cost-effective choice for Quebec residents.
Heating Performance Down to -25°C: An Essential Criterion
Adapted to Harsh Winters
The FORESTAIR system is designed to operate efficiently for heating down to -25°C, which is essential in regions such as:
- Montreal
- Laval
- Longueuil
- North Shore (e.g., Terrebonne, Blainville)
- South Shore (e.g., Brossard, Saint-Hubert)
According to the technical sheet, the heat pump maintains stable heating capacity even in cold conditions.
AirGreen Field Experience
We have observed that this model:
- Maintains constant heat even in January
- Reduces reliance on auxiliary heating
- Offers excellent thermal stability
R-454B Refrigerant: A More Responsible Choice
The model uses R-454B refrigerant, a more ecological alternative compared to older gases like R-410A.
Advantages:
- Reduced environmental impact
- Compliance with future standards
- Improved thermal efficiency
At AirGreen, we systematically prioritize systems using modern refrigerants to anticipate regulations and offer a sustainable solution.
HVAC Installation: What You Need to Know
Important Technical Data
- Voltage: 220V
- MCA: 28A
- Recommended Breaker: 45A
- Maximum Total Piping Length: 90 meters
- Maximum Length per Zone: 30 meters
These characteristics allow for great installation flexibility, even in complex properties.
Real Challenges Faced
During an installation in Laval, we had to:
- Run ducts over two floors
- Optimize piping lengths
- Avoid performance losses
Thanks to the system's capabilities, we were able to maintain optimal performance despite the project's complexity.
Noise Level: Often Underestimated Comfort
- Indoor: 30 to 46 dB(A)
- Outdoor: 65 dB(A)
This means:
- Almost inaudible in bedrooms
- Outdoor noise level comparable to a normal conversation
We always recommend this model to noise-sensitive clients.
Integrated WiFi and Smart Control
The presence of integrated WiFi allows for:
- Remote control via smartphone
- Scheduling
- Real-time temperature adjustment
Concrete example:
A client in Montreal adjusts the temperature of their secondary chalet before arrival, which optimizes their comfort while reducing unnecessary consumption.
HVAC Maintenance: Best Practices
To maximize the lifespan of your heat pump:
- Clean filters every 3 months
- Annual professional maintenance
- Check connections and refrigerant fluid
At AirGreen, we offer tailored HVAC maintenance programs to ensure:
- Optimal performance
- Warranty maintenance
- Reduced risk of breakdowns
Common Mistakes to Avoid
1. Incorrect Zone Distribution
Installing improperly sized units leads to:
- Thermal discomfort
- Overconsumption
2. Unprofessional Installation
Inadequate installation can cause:
- Refrigerant leaks
- Poor drainage
- Loss of efficiency
3. Neglecting Duct Length
Technical limits must be respected to avoid loss of performance.
Why Choose AirGreen for Your HVAC Installation
At AirGreen, we go far beyond simple installation:
- Accurate needs assessment
- Custom zone design
- Installation compliant with RBQ standards
- Fast and efficient after-sales service
We have installed hundreds of multi-zone systems across:
- Montreal
- Laval
- Longueuil
- North Shore
- South Shore
Our field expertise allows us to anticipate problems even before they arise.
Conclusion: A Reliable and Cost-Effective Multi-Zone Heat Pump
The FORESTAIR MZ R454B 42,000 BTU 4-zone wall-mounted heat pump represents a complete solution for Quebec residences:
- Excellent heating performance down to -25°C
- High energy efficiency
- Multi-zone flexibility
- Modern and ecological technology
It stands out as a wise choice for owners seeking a high-performance, durable, and well-adapted system to Quebec's climatic realities.
Contact AirGreen Today
For a personalized quote, a needs analysis, or a professional HVAC installation in Montreal, Laval, Longueuil, North Shore, or South Shore, contact our team now.
We support you every step of the way to ensure optimal comfort and uncompromising installation.
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: 31,000 BTU/h at −8 °C, 30,000 at −15 °C.
How many heads can I connect?
Up to 5 on this outdoor unit. This product is configured for 4 heads.
How much is the LogisVert grant?
$3,720 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 4529626. 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.