Ameristar DoubleZone Wall Heat Pump | 42,000 BTU Compressor | Installation in Montreal, Laval, Longueuil, South Shore & North Shore
The Ameristar 42 000 multi-zone heat pump heats and cools 2 rooms with a single outdoor unit. it delivers 35,600 BTU/h at −8 °C, heats down to −30 °C and qualifies for a $4,272 LogisVert grant. Installed by AirGreen in Montréal, Laval, Longueuil, the North Shore and the South Shore.
2 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 8,870 to 38,200 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 77 % 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.
Ameristar Wall-Mounted DoubleZone Heat Pump
Innovation at the Service of Comfort: The Ameristar Wall-Mounted DoubleZone Heat Pump
At AirGreen, located in the heart of Montreal and also serving Laval, Longueuil, as well as the South Shore and North Shore, we are proud to present our revolutionary heating and cooling solution: the Ameristar Wall-Mounted DoubleZone Heat Pump. Designed to transform your home comfort experience, this advanced technology represents the ultimate in indoor climate management.
Unique Features of the Wall-Mounted DoubleZone Heat Pump
Our Ameristar Wall-Mounted DoubleZone Heat Pump stands out for its exceptional capabilities and user-centric design:
- Power and efficiency: With a 42,000 BTU compressor, it offers remarkable cooling capacity and heating performance down to -30°C, ensuring your comfort throughout the year, regardless of the external conditions.
- Optimal flexibility: Capable of managing up to 5 zones with an initial 2-zone setup, it perfectly adapts to the size and structure of your space, ensuring even temperature distribution.
- Series and dimensions: The outdoor and indoor units have specific serial numbers (M4THM1942A15N for the outside, M4MHW2309A1N0 to M4MHW2324A1N0 for the inside), facilitating identification and after-sales service.
- Subsidies and savings: Eligible for federal and provincial subsidies, this model is also Energy Star® certified, allowing you to make significant savings on your energy bills.
Technological Advantages
The Ameristar Wall-Mounted DoubleZone Heat Pump incorporates cutting-edge features to enhance your experience:
- Wi-Fi optional: For remote management via your smartphone, offering you control and comfort wherever you are.
- High efficiency: With a 21.0 SEER efficiency rating, it ensures exceptional energy efficiency, reducing environmental impact and operating costs.
- Silence and discretion: The sound pressure level of 63.0 dB(A) guarantees almost inaudible operation, for unmatched acoustic comfort.
- Durability and reliability: The R-410A gas used, in addition to being environmentally friendly, ensures lasting performance. The 10-year warranty on all parts, with 6 years on labor, attests to our confidence in our product's reliability.
Professional Installation and After-Sales Service
Our team of experts, trained in the latest HVAC technologies, ensures professional installation and responsive after-sales service. Whether you live in Montreal, Laval, Longueuil, or the surrounding areas, we commit to providing a flawless customer experience, from the initial consultation to long-term technical support.
Why Choose the Ameristar Wall-Mounted DoubleZone Heat Pump?
Opting for the Ameristar Wall-Mounted DoubleZone Heat Pump means choosing a heating and cooling solution that combines performance, savings, and environmental respect. It represents a smart investment for homeowners concerned about their comfort and their home's energy efficiency.
At AirGreen, we are dedicated to providing you with innovative and tailor-made solutions. We understand that every home is unique, and that's why we work to offer products and services that precisely meet your needs. Discover how the Ameristar Wall-Mounted DoubleZone Heat Pump can transform your living space into a haven of comfort and efficiency.
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: 35,600 BTU/h at −8 °C, 32,400 at −15 °C.
How many heads can I connect?
Up to 5 on this outdoor unit. This product is configured for 2 heads.
Can I mix head sizes?
Yes. The “Zones” menu offers 10 combinations, from 9 + 9 to 24 + 24 (in thousands of BTU). Each head is sized for its room.
How much is the LogisVert grant?
$4,272 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 2415513. 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.
Is it noisy?
Indoors, the reference head goes down to 29 dB(A). Outdoors, 63 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.