FORESTAIR MZ R454B 5-Zone Wall-Mounted Heat Pump | Ext: 42000 BTU
The ForestAir MZ R454B 42 000 multi-zone heat pump heats and cools 5 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.
5 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 Solution for Modern Homes in Montreal
In Quebec's demanding climate, particularly in Montreal, Laval, Longueuil, on the North Shore, and the South Shore, choosing a high-performance HVAC system is not an option, but a necessity. The 42,000 BTU FORESTAIR MZ R454B 5-zone wall-mounted heat pump stands out as a complete, reliable, and intelligent solution for properties requiring precise control of multiple spaces.
At AirGreen, we regularly install this type of multi-zone system in single-family homes, duplexes, and multi-unit buildings. This configuration optimizes comfort while reducing overall energy consumption.
Why choose a 5-zone multi-zone heat pump?
Independent Comfort Management
With a capacity of up to 5 distinct zones, this system allows for independent temperature control in different rooms:
- Bedrooms
- Living room
- Basement
- Home office
- Seldom-used rooms
Each indoor unit can be configured according to specific needs, which helps avoid unnecessary energy waste.
Concrete AirGreen Example
During a recent installation in Boucherville (South Shore), a client had a multi-story house with significant temperature variations between the ground floor and the upper floor. Thanks to this FORESTAIR 5-zone heat pump, we installed:
- 1 x 18,000 BTU unit in the living room
- 2 x 9,000 BTU units for the bedrooms
- 1 x 12,000 BTU unit for the basement
- 1 x 9,000 BTU unit for an office
Result: a significant reduction in complaints related to temperature differences and a measured decrease in energy consumption.
Performance and energy efficiency adapted to the Quebec climate
Effective heating down to -25°C
This model is designed to operate efficiently even during harsh winters:
- Heating capacity down to -25°C
- Stable performance at low temperatures
- Smart defrost technology
According to the manufacturer's technical data, the heat pump maintains excellent thermal performance in extreme conditions.
High energy efficiency
- SEER2: 22.0
- HSPF2: 10.0
- COP: 3.50
These values indicate excellent energy efficiency, which directly translates into savings on electricity bills, particularly important in regions like Montreal and Laval where energy costs are significant.
Advanced technology and technical specifications
DC Inverter Compressor
The Inverter technology allows for:
- Precise power modulation
- Reduced on/off cycles
- Extended system lifespan
Eco-friendly refrigerant R-454B
Unlike older systems using R-410A:
- R-454B reduces environmental impact
- Better energy efficiency
- Compliance with new environmental standards
Essential technical data
- Cooling capacity: 42,000 BTU
- Voltage: 208-230V / 1 phase / 60 Hz
- Outdoor sound level: 65 dB(A)
- Maximum line length: 90 meters (295 feet)
- Maximum length per zone: 30 meters (98 feet)
These specifications offer great flexibility for complex installations, especially in existing buildings in Longueuil or on the North Shore.
HVAC Installation: What clients need to know
Complexity of a multi-zone system
Unlike a simple heat pump:
- Precise thermal load calculations required
- Strategic sizing of indoor units
- Management of piping lengths
At AirGreen, we have found that several poorly designed installations lead to:
- Performance losses
- Poorly heated zones
- Premature compressor wear
Our professional approach
We always proceed with:
- A complete building analysis
- A thermal load calculation
- Optimal zone configuration
- Installation conforming to RBQ standards
Subsidies and available savings in Quebec
LogisVert Program
This model is eligible for a subsidy of up to:
- $3,720
This financial aid is particularly advantageous for homeowners in Montreal, Laval, and Longueuil, significantly reducing the initial investment cost.
Maintenance and durability
Importance of HVAC maintenance
A multi-zone system requires regular maintenance:
- Filter cleaning
- Pressure checks
- Line inspection
Neglected maintenance can lead to:
- Decreased efficiency
- Increased energy costs
- Premature breakdowns
AirGreen feedback
We recently corrected an installation in Laval where maintenance had been ignored for 3 years:
- 30% loss of performance
- Partial system blockage
- Avoidable repair costs
Common mistakes to avoid
- Undersizing or oversizing indoor units
- Neglecting maximum line length
- Installing without prior thermal study
- Choosing an uncertified installer
These errors are unfortunately common in the HVAC market in Montreal and on the South Shore.
Why choose AirGreen for your FORESTAIR heat pump?
Recognized local expertise
- Installations carried out across Montreal, Laval, Longueuil, North Shore, and South Shore
- RBQ certified technicians
- Concrete field experience
Transparency and quality
- Clear pricing from the start
- No surprises
- Prompt after-sales service
Personalized approach
Every project is unique. We adapt:
- The choice of units
- The zone configuration
- The installation according to your dwelling
An ideal solution for modern and multi-space homes
The FORESTAIR MZ R454B 42,000 BTU 5-zone wall-mounted heat pump represents a complete solution for homeowners looking to:
- Maximize comfort
- Reduce their energy costs
- Benefit from a flexible and scalable system
It is particularly suitable for multi-story homes, duplexes, and major renovations.
Contact AirGreen for your HVAC project
Are you considering installing a multi-zone heat pump in Montreal, Laval, Longueuil, on the North Shore, or the South Shore?
Our team is ready to assist you with a complete analysis and a detailed quote.
Contact us today for a personalized quote and discover the best solution for your property.
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 5 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.