5-Zone Heat Pump CONFORTO MHMZ | 48,000 BTU - R410A
The Conforto MHMZ 48 000 multi-zone heat pump heats and cools 5 rooms with a single outdoor unit. ENERGY STAR cold-climate certified, it delivers 36,000 BTU/h at −8 °C, heats down to −30 °C and qualifies for a $4,320 LogisVert grant. Installed by AirGreen in Montréal, Laval, Longueuil, the North Shore and the South Shore.
5 rooms, one outdoor unit.
Figures come from the manufacturer’s data and the AHRI certification.
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.
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 93 % of its rated capacity.
Tap a temperature: capacity, efficiency and the cost of one hour of heating.
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.
A grant you can calculate, not guess.
The capacity at −8 °C. $120 per 1,000 BTU/h is the rate for ENERGY STAR cold-climate heat pumps (guide v1.10).
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 whole family home switched to a heat pump: five zones, a single outdoor unit
Replacing the heating of an entire house is not done by adding one head in the living room. Each room where people actually live needs to be equipped, without covering the facade with outdoor units. The 5-Zone Heat Pump CONFORTO MHMZ | 48,000 BTU - R410A does it with five wall heads, one per main room, all connected to a single MHMZ548DACFC condenser.
This 4-ton condenser serves 5 zones here, which is its maximum of 5. The wall heads intended for it are the MHWAL09DACFC, the MHWAL12DACFC and the MHWAL24DACFC. Its certified ratings are 21.8 SEER2, 11.7 EER2 and 9.8 HSPF2. The system is ENERGY STAR certified with the cold-climate designation under ENERGY STAR ID 2495078, and it qualifies for a $4,320 LogisVert grant.
Moving from baseboards to a heat pump, room by room
In a house heated with electric baseboards, each room has its own heater. For a heat pump to truly take over, it has to be present in the rooms that matter: the living space, the kitchen or dining room, the bedrooms, the office. Five zones cover most of a medium to large family home, whether a two-storey, a large bungalow with a basement or an extended house.
The baseboards do not disappear, however. They remain the backup for extreme cold in the equipped rooms, and the main heating in the small rooms that do not get a head.
Which rooms get a head
The MHWAL24DACFC, the largest of the intended heads, goes in the living space, often open to the kitchen. The MHWAL12DACFC suits the main bedroom or a separate dining room. The MHWAL09DACFC serves the children's rooms and the office. The load calculation confirms each choice.
Some rooms stay without a head, and that is intentional: bathrooms, laundry room, hallway, small entryway. These spaces are small, often closed, and a wall head would add nothing that their baseboard does not already do. We go over the list with you room by room during the visit, showing what changes and what stays.
Five heads on 48,000 BTU
The five heads share the condenser's capacity. The rooms of a family home rarely reach full demand all at the same time; the rest of the time, the occupied rooms benefit from the capacity the others are not using. On the coldest nights, they all call together, and that is the moment our calculation checks. With 5 zones out of a maximum of 5, every connection is used.
The condenser's inverter compressor follows these variations by adjusting its speed and metering the R-410A refrigerant sent to each head. The five heads always work in the same mode, heating or cooling, as on any multi-zone system of this type. Shutting off an unoccupied zone leaves the other four running.
One unit outside, five neatly grouped routes
Five separate wall-mounted heat pumps would mean five outdoor units around the house. Here, a single condenser, set above the snow line on a stand or a sturdy bracket, away from snow sliding off the roof. All five refrigerant line sets run back to it; we group them in one or two painted line covers that follow the lines of the facade, or run them indoors when a closet, the attic or the basement ceiling allows it. You see each route before the first hole is drilled.
What the certificate shows for winter
The certificate lists 36,000 BTU/h at -8 °C (17 °F), with a COP of 2.30, and 45,000 BTU/h at -15 °C (5 °F), with a COP of 2.00. The maximum published capacity is 45,000 BTU/h at -15 °C. The two points are measured separately; we report each one as published.
A COP of 2.00 means that at -15 °C, each kilowatt-hour consumed returns two kilowatt-hours of heat, where a baseboard returns one. At -8 °C, the ratio rises to 2.30. For a house moving from baseboards to a heat pump, this is the figure that sums up the change. ENERGY STAR's cold-climate designation confirms that the combination meets the low-temperature performance criteria.
These figures come from certificate AHRI 210605819, published by NEEP.
Backup heat and defrost
The certificate does not publish a point colder than -15 °C. The baseboards in the equipped rooms therefore stay set slightly below the heads' set point: off for most of the winter, they take over during extreme cold. In cold, humid weather, the condenser also runs defrost cycles of a few minutes; the heads then stop blowing warm air and a cloud of vapour rises from the outdoor unit. This is normal.
Cooling the whole house
In cooling, the system is built around a nominal size of 48,000 BTU/h for the five zones. The whole house is cooled, room by room, without window air conditioners or portable units. The bedrooms are set for the night, the living space for the day, and an empty room can be shut off. Extended low-speed operation removes moisture from the air; each head also offers a dehumidification mode.
The 21.8 SEER2, 11.7 EER2 and 9.8 HSPF2 ratings
- HSPF2: heating efficiency over the whole cold season. For an entire house converted to a heat pump, this is the rating that weighs most.
- SEER2: cooling efficiency over a whole summer.
- EER2: cooling at full load, in hot weather.
- COP: the ratio between heat delivered and electricity consumed at a specific temperature.
The $4,320 LogisVert grant
The system is listed in Hydro-Québec's LogisVert program, with $4,320 for the owner of an existing home, according to the list in effect on the installation date. We confirm eligibility before signing and prepare the detailed invoice, model numbers and proof of payment. Our page on the efficient heat pump grant summarizes the program's conditions.
Installation and follow-up
Our installation
- Visit and load calculation: each room is measured, and the list of equipped rooms is drawn up with you.
- Electrical panel: a 4-ton condenser requires a larger dedicated circuit; we check the panel's space and capacity.
- Lines and drains: one line set and one sloped condensate drain per head; a pump only where gravity is not enough.
- Commissioning: vacuum, leak test, check of each zone, then setup of the five remotes with you.
Maintaining five heads
Rinse the filters of all five heads every two weeks in season; doing them all on the same day keeps any from being forgotten. Keep the condenser clear of snow and leaves, without covering it in winter. One HVAC maintenance visit per year cleans the coils, fans and drains and checks the electrical connections; on a system the whole house depends on, it reduces the risk of a shutdown in the middle of winter. Our cleaning service takes over when you prefer to hand off the annual visit.
AirGreen, for the life of the installation
A family business active for more than fifteen years in Montreal, Laval, Longueuil, the North Shore and the South Shore, we hold RBQ licences for ventilation, refrigeration and electrical work and carry $5,000,000 in liability insurance. The in-home assessment is free, the quote is in writing, and our financing options let you choose the right unit rather than the cheapest one.
Request your free estimate for the 5-Zone Heat Pump CONFORTO MHMZ | 48,000 BTU - R410A. We assess your home room by room and confirm the right size and your grant eligibility before signing.
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: 36,000 BTU/h at −8 °C, 45,000 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?
$4,320. 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 2495078.
Down to what temperature does it heat?
Down to −30 °C.
Is it noisy?
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.
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.