Three zones, three different needs: in Saint-Pie, the positioning of the indoor units was at the heart of the project
This installation of a GREE FreeMatch R32 3-head heat pump in Saint-Pie recalls an essential reality of multi-zone systems: a good installation is judged not only by the outdoor unit. Everyday comfort depends primarily on the indoor components—the capacity selected for each head, its position on the wall, the airflow direction, and its relationship with the other two zones connected to the same condenser.
The photo from this project shows precisely one of the GREE wall-mounted indoor units installed in the residence. We positioned it high, near the ceiling and close to a wall corner, on a relatively unobstructed surface. The wall below the unit remains available, while the air outlet can project heating or cooling into the room without a tall piece of furniture directly blocking the airflow.
This type of positioning seems simple after the work is complete. In reality, it results from several decisions made before even drilling the wall: where the refrigerant lines would run, how the condensate drain could flow, in which direction the air should be directed, which part of the room should be prioritized, and how this head would work with the other two units of the 3-zone heat pump?
For this project at Saint-Pie, we selected the GREE FreeMatch R32, a multi-zone system designed to power several indoor units from a single outdoor unit. The manufacturer's documentation states up to 21 SEER2, 12.5 EER2 and 10 HSPF2, with a heating range down to -30 °C depending on operating conditions.
A wall-mounted head installed high, but not simply “as high as possible”
In the photo, the indoor unit occupies the upper part of the wall. This choice naturally promotes airflow, but installing a head near the ceiling does not mean it should be wedged against it.
The unit draws a significant portion of its air from above. It must therefore maintain the clearance required by the manufacturer to allow sufficient airflow and facilitate opening the panel when cleaning the filters.
We consider all of the following at once:
- the clearance above the unit;
- the distance from the adjacent wall;
- the space required to open the front panel;
- the path of the louvers;
- access to the filters;
- the position of the furniture;
- the route of the lines behind or near the head.
In this installation, the unit is placed in a high, unobstructed section of the wall. The large open area beneath the heat pump also allows the homeowner to use the room without having to reserve an entire section of wall for HVAC equipment.
Why the corner of the room deserves particular attention
The unit is located relatively close to the left side wall. This type of placement can be highly effective when the airflow is directed along the usable length of the room.
We nevertheless ensure that an adjacent wall limits neither air intake nor airflow. The goal is not simply to find a place where the unit “fits,” but to turn its location into an effective distribution point.
A head placed in the wrong location can produce a satisfactory temperature around itself while leaving another part of the room uncomfortable.
Why three heads instead of a single very large wall-mounted heat pump
In some residences, a single indoor unit can serve a large open area. As soon as rooms are separated by doors, hallways, or different floors, this strategy quickly reaches its limits.
Cold or warm air does not automatically travel throughout an entire house simply because the head has more BTUs.
This is where the GREE FreeMatch R32 multi-zone system becomes worthwhile.
Three heads can directly serve three distinct areas. Each indoor unit can have its own temperature setting and operate according to the needs of its zone.
This may be relevant, for example, when a residence includes:
- a main open area;
- a bedroom or nighttime area;
- a basement, an office, or a second level.
The photo does not make it possible to identify the three exact rooms served in this project, so we avoid assigning them a function that is not documented. The technical principle remains the same, however: each head must be sized for its own zone, then properly combined with the outdoor unit.
The FreeMatch R32 offers several capacities for a three-head configuration
The GREE product line’s technical data sheet lists several outdoor units. For a system comprising three indoor units, different capacities may be suitable depending on the load calculation.
The manufacturer’s table indicates, among other things:
| GREE outdoor unit | Number of connectable indoor units | Rated cooling | Rated heating |
|---|---|---|---|
| GWHD(24)ND6MO | 2 to 3 | 24,000 BTU/h | 24,000 BTU/h |
| GWHD(30)ND6MO | 2 to 4 | 28,400 BTU/h | 30,000 BTU/h |
| GWHD(36)ND6MO | 2 to 4 | 36,000 BTU/h | 36,000 BTU/h |
| GWHD(42)ND6MO | 2 to 5 | 42,000 BTU/h | 44,300 BTU/h |
These capacities and connection limits appear in the technical table on page 2.
The 18,000 BTU model in the same series accepts only two indoor units; it therefore does not correspond to a three-unit configuration.
The interior photo from the job site of Saint-Pie does not make it possible to determine precisely which outdoor unit is being used. A wall-mounted unit of similar dimensions can be paired with different combinations. We therefore rely on the quote, the nameplates, and the certified combination rather than on a visual estimate.
Three indoor units do not mean three identical capacities
One of the most common mistakes when planning a multi-zone heat pump consists of choosing three identical indoor units simply because there are three rooms.
Consider three spaces of different sizes. A large open area exposed to the sun may have a significantly higher load than a well-insulated interior bedroom. A third zone located upstairs may accumulate more heat in summer.
In this case, distributing three identical capacities can create an unnecessary compromise.
We instead analyze:
- area of each zone;
- heat losses in winter;
- solar gains in summer;
- amount of glazing;
- insulation;
- room orientation;
- ceiling height;
- doors and passageways to other areas;
- occupancy frequency.
This approach makes it possible to select each indoor unit according to what it actually needs to accomplish.
Comfort depends as much on airflow as on the number of BTUs
An indoor unit may be correctly sized on paper and still provide poor comfort if its air is directed toward an obstacle or directly at occupants.
The visible position in this installation leaves a wide open area in front of the unit.
We generally seek to avoid direct and permanent airflow toward:
- a bed;
- a sofa;
- a workstation;
- a dining table;
- a wall located too close;
- a tall piece of furniture.
Louvers allow you to adjust the airflow direction, but they cannot fully compensate for a poor location choice.
In air conditioning
Cold air naturally tends to descend. A high installation allows it to be projected farther before it spreads throughout the room.
In heating
Warm air tends to rise. We must therefore use the louver direction and fan speed to send heat toward the occupied area rather than letting it accumulate near the ceiling.
This difference explains why a location that seems excellent for air conditioning must also be evaluated from the perspective of winter heating.
The FreeMatch R32 and the cold winters of Montérégie
For this range, GREE announces a heating operating range down to -30 °C and a cooling range of -30 °C to 48 °C.
This information is particularly relevant in a municipality such as Saint-Pie, where the heat pump must be selected for more than just a few warm days in July.
However, we must clarify what this minimum temperature means.
A machine capable of operating at -30 °C does not necessarily provide its full rated capacity at -30 °C. The available capacity of a heat pump generally varies with the outdoor temperature.
To properly size a heating system, we must therefore consider:
- the available capacity at low temperatures;
- the building's heat losses;
- the simultaneity of the three zones;
- the supplemental heating present in the residence;
- the homeowner's temperature habits.
Variable-speed technology: why it suits multi-zone systems
The documentation mentions inverter technology G10, as well as intelligent defrosting, self-diagnostics, and automatic voltage adaptation.
In a three-head heat pump, modulation is particularly relevant because needs change continuously.
At a given moment:
- one head may call for substantial heating;
- the second may be nearly at its setpoint;
- the third may be switched off.
Later, the situation may reverse.
The outdoor unit must therefore adapt its output to the combined demands rather than operating solely according to a full-capacity on-off logic.
This modulation helps maintain more stable temperatures and reduces the periods when the machine unnecessarily produces more than required.
One essential rule: all three heads must operate in a compatible mode
A 3-head heat pump allows individual temperature control, but it is not equivalent to three completely independent refrigeration systems.
The units share the same outdoor unit.
This means that one head can be set to 20 °C and another to 22 °C, but they must operate in a compatible mode.
It is not possible to request simultaneously:
- from heating to one head;
- from one air conditioner to another.
If two users select contradictory modes, some units may go into standby until the commands become compatible again.
We always explain this feature during commissioning. It prevents many calls from people who think a head is defective when it is simply waiting for a request compatible with the rest of the system.
Condensate drainage begins with choosing the location
The photo shows a head mounted high on the wall. Behind this installation is a component the owner rarely sees: the condensate drain.
In air conditioning, the indoor coil removes moisture from the air. This water must be drained away without returning to the unit.
When the configuration allows it, we favor gravity drainage with a sufficient slope.
Before securing the wall plate, we must therefore already know:
- where the drain will exit;
- what slope is available;
- where the pipes will run;
- whether a condensate pump is necessary;
- how the drain will remain accessible for future cleaning.
A head can be perfectly level on the wall and nevertheless cause problems if the drain behind it is poorly designed.
Three heads mean three drains to check
During commissioning, we do not only check that the outdoor unit starts.
Each indoor unit has its own drainage system. We therefore check the three zones separately.
Symptoms of a problematic drain may include:
- water accumulating in the unit;
- a gurgling sound;
- an unusual odor;
- drops on the wall;
- a leak after several hours of air conditioning.
A test performed immediately after installation can detect these problems before they become interior damage.
What the owner should know to maintain the performance of the three-zone system
Once the installation is complete, the GREE FreeMatch R32 does not require complex daily maintenance. However, a few habits directly affect comfort and efficiency.
Cleaning the filters of all three heads, not just the one in the main room,
On the unit shown in the photo, the filters are accessed through the front panel.
When the head operates regularly, the filters accumulate dust, fibers, and particles present in the room.
A clogged filter reduces airflow. The system may then seem less effective even if the refrigerant circuit is in perfect condition.
With three heads, do not forget the units that are less visible or used less often.
We recommend regularly checking the condition of the filters. The exact frequency depends on the presence of pets, dust, renovations, and the number of hours of use.
Maintaining the outdoor unit is just as important
The indoor system cannot work properly if the outdoor coil is obstructed.
The owner should ensure that:
- leaves do not accumulate around the unit;
- snow does not block the air intake or outlet;
- no box or structure is placed in front of the fan;
- defrosting ice does not reach the base;
- the outdoor piping remains protected.
The manufacturer indicates an intelligent defrosting system in the range specifications.
Even with this function, the physical area around the unit must remain clear so that defrosting can take place properly.
Up to 100 meters of piping, depending on the model
The multi-zone configuration is particularly useful when the three indoor units cannot be installed in the immediate vicinity of the condenser.
Depending on the outdoor unit selected, GREE specifies a maximum total length of 40 to 100 meters and a maximum height difference of 15 to 25 meters.
Models compatible with three heads allow, in particular:
- up to 60 m for the 24,000 BTU unit;
- up to 80 m for the 30,000 and 36,000 BTU units;
- up to 100 m for the 42,000 BTU unit.
These limits provide considerable flexibility for distributing three heads throughout the building.
However, we never seek to use more piping than necessary. A well-designed route remains easier to protect, test, and maintain.
Refrigerant connections must be prepared with particular care when using R32
The range uses R32 refrigerant and includes an A2L leak detection sensor according to GREE documentation.
The number of connections increases with three indoor units. Each branch therefore represents an additional set of connections to prepare and check.
Our procedure includes, in particular:
- preparing the copper tubing;
- making the flares;
- tightening to the proper torque;
- leak test;
- evacuating the system;
- checking vacuum stability;
- opening the service valves;
- checking the refrigerant charge;
- operational tests for the three zones.
The technical data sheet indicates connections of 1/4 in. for liquid and 3/8 in. for gas for the listed outdoor units.
The refrigerant charge also depends on the total installed length
Outdoor units are supplied with a charge intended for a certain pipe length. When the installation exceeds this length, an additional charge may be required.
The technical table indicates an addition of 20 g/m according to the conditions specified by the manufacturer.
On a three-head installation, this check is particularly important because the combined length of the branches must be considered.
A rough estimate is not sufficient. We need to know the actual lengths.
The electrical system must follow the outdoor model, not simply the number of heads
The entire outdoor range presented in the document operates at 208/230 V.
However, the electrical protection varies considerably according to capacity.
The specification sheet states:
- an MCA of 14.5 to 30 A;
- maximum overcurrent protection of 20 to 45 A.
There is therefore no “standard circuit breaker for a three-head heat pump.”
The exact outdoor unit model determines the circuit size and the maximum permitted protection.
The ENERGY STAR ratings and AHRI numbers must correspond to the complete combination
Page 2 of the technical document lists separate AHRI numbers for the configurations non-ducted, ducted, and mixed.
For non-ducted configurations, the references listed range from 214931586 to 214931590 depending on the outdoor unit. The table also identifies the equipment as ENERGY STAR.
This detail becomes important when a homeowner checks for financial assistance.
A heat pump with the same commercial name may have different head combinations. The AHRI number must therefore correspond to the system actually installed.
Rebates and programs: the combination must be validated before promising an amount
The GREE document indicates that the range is eligible for local rebates, without providing a universal amount valid for all projects.
Before confirming financial assistance, we verify:
- the outdoor unit;
- the three indoor units;
- the AHRI number;
- the type of residence;
- the installation date;
- the program rules in effect;
- the necessary supporting documents.
This verification prevents choosing a configuration based on a rebate amount that actually corresponds to another combination.
Warranty: keep the information for all four units
The document provided indicates a 10-year standard warranty, with two additional years offered by Wolseley when the product is registered and/or proof of installation is provided, according to the applicable terms.
For a three-head heat pump, the file should include:
- the outdoor unit model;
- its serial number;
- the models of the three indoor units;
- their three serial numbers;
- the invoice;
- the installation date;
- the AHRI combination;
- the required registration proofs.
Mistakes to avoid with a three-head heat pump
Choose heads solely according to area
Two rooms of the same area can have very different loads because of their windows, orientation, or level in the house.
Install a head wherever there happens to be space
Blowing, suction, drainage, and refrigerant routing must all be considered.
Placing the unit directly in front of a bed or sofa.
Even a perfectly controlled temperature can become uncomfortable when the airflow continuously blows onto occupants.
Blocking the top of the head
The intake and filter access must remain unobstructed.
Using opposing modes on all three units
The setpoints may differ, but the modes must remain compatible.
Neglecting the filters in a rarely used zone
A head that operates less often still accumulates dust over time.
Mechanically adding up the BTUs of the three units
The outdoor unit must be selected based on the load calculation and a manufacturer-recognized combination.
Assuming that a heat pump operating at -30 °C delivers its full rated capacity at that temperature
The minimum operating temperature and the available capacity are two different pieces of information.
Assuming that a GREE FreeMatch is automatically eligible for the same rebate
The AHRI reference of the actually installed system remains decisive.
An installation that illustrates how we work at AirGreen
This GREE FreeMatch R32 installation in Saint-Pie visually appears understated: a white unit installed high on a light-colored wall, without any dramatic alteration to the room.
This is exactly what we are looking for.
A good HVAC installation should integrate into the building while respecting the technical elements that are no longer visible after finishing.
Behind this indoor head are several decisions: height, side clearance, airflow, drainage, piping, communication with the outdoor unit, zone capacity, and its relationship with the other two units.
At AirGreen, we apply this same method to our heat pumps in Montreal, Laval, Longueuil, on the North Shore and the South Shore, as well as in Montérégie municipalities such as Saint-Pie.
For every three-head project, we seek to match three elements:
the right capacity, in the right place, for the right zone.
When these three decisions are made correctly, the owner does not notice the system's technical complexity. They simply notice that the rooms are more comfortable, the settings are easy to manage, and the indoor units blend naturally into the home.
This is exactly the result sought with this 3-head GREE FreeMatch R32 heat pump in Saint-Pie three zones treated separately, a discreet indoor wall-mounted installation, and a multi-zone system designed to provide service during both summer heat and Quebec's cold periods.