A wall-mounted unit precisely integrated between the window, ceiling, and adjacent wall
In this residence from Blainville, the installation of a GREE FreeMatch R32 3-head heat pump had to meet two priorities that do not always naturally go hand in hand: achieving effective airflow distribution across three distinct zones while maintaining a clean, understated interior finish. The project photograph shows one of the three wall-mounted units, installed in a relatively narrow section of wall, right beside a window fitted with a thick curtain and near an inside corner.
This location required more than simple visual centering. An indoor unit must draw in sufficient air through its upper section, blow unobstructed air through its lower louver, and remain accessible for filter cleaning. It must also prevent fabrics, furniture, or decorative elements from disrupting its operation.
We therefore positioned this wall-mounted head high up while maintaining visible air-intake clearance above the unit. The curtain remains beside the unit rather than in front of the air outlet, and the unobstructed wall facing the louver allows the airflow to distribute throughout the room. The result is a clean HVAC installation, discreet, and suited to the space’s everyday use.
How positioning this wall-mounted head contributes to comfort
Airflow directed toward the usable volume of the room
A wall-mounted heat pump placed too close to an obstacle may send part of its airflow directly against a wall, curtain, or piece of furniture. The air then quickly returns to the unit without properly conditioning the room. This phenomenon can create temperature differences and cause the heat pump to reduce its capacity too early.
On this installation in Blainville, the air outlet louver faces an open area. The air can be directed downward in heating mode and more horizontally in cooling mode, depending on the selected setting. This orientation is particularly important with a multi-zone system, since each head must condition its own zone consistently without relying on airflow from other rooms.
In winter, warm air naturally tends to rise. We therefore generally adjust the louver direction to send the heat toward the occupied part of the room. In summer, more horizontal airflow helps the cool air travel a greater distance before gradually descending.
A reasonable distance from the ceiling
The head is installed near the ceiling, but not flush against it. This space is necessary because most wall-mounted units draw room air in through the top. Insufficient clearance can limit airflow, increase operating noise, and make it difficult to open the front panel.
The filter must also be removable without having to dismantle the unit or damage the ceiling. We always incorporate this access into our planning, because theHVAC maintenance must not become a difficult operation after installation.
For the homeowner, this decision makes several routine tasks easier:
- open the front panel;
- remove and reinstall the filters;
- clean the top surface of the unit;
- inspect the air outlet louver;
- quickly check whether unusual noise or vibration appears.
A curtain kept away from the air intake and outlet
The curtain visible in the photo is an important element of the room, but also a technical constraint. Fabric drawn toward the top of the unit can reduce airflow. If it moves in front of the lower louver, it can divert the airflow or produce repetitive, noisy movement.
The selected position keeps the curtain to the left of the head. However, it is still recommended to ensure that it does not move toward the unit when the window is open or when a draft passes through the room.
This detail is often underestimated when choosing a location. During our installations of wall-mounted air conditioner in Montreal, Laval, Longueuil, on the North Shore and South Shorewe systematically check curtains, blinds, doors, cabinets, and other moving elements before drilling the wall.
A white line set cover integrated into the interior finish
To the left of the unit, a white line set cover protects the route of the refrigerant lines, wiring, and, depending on the configuration, the condensate drain. It follows a vertical line near the window and blends into the wall color rather than leaving the connections exposed.
The line set cover is not only intended to improve appearance. It also protects:
- pipe insulation;
- communication cables;
- connections against impact;
- the drainage route;
- wall surfaces against friction.
In a three-head installation, each indoor unit has its own route. Planning these three routes can influence the choice of outdoor unit, the total piping length, the amount of refrigerant, and the location of each head.
Why choose a three-head heat pump for a Blainville residence
A multi-zone heat pump connects multiple indoor units to a single outdoor unit. In this project, three heads make it possible to condition three separate spaces without installing three condensers around the property.
Each head has its own temperature setpoint and fan speed. A bedroom can therefore be maintained at a different temperature from a living area or office. Unused zones can also be set more moderately, avoiding the need to condition every room in exactly the same way.
However, it is important to understand that the three units share the outdoor unit's capacity. They are not three completely independent heat pumps. When multiple heads operate simultaneously, the compressor distributes its output among the zones calling for service.
In a conventional multizone heat pump system, the indoor units must also operate in the same general mode. Temperatures can be set differently, but one head normally cannot cool while another calls for heating. This feature must be considered when rooms have very different solar exposures.
A range of outdoor units suited to multiple combinations
The indoor photograph shows neither the outdoor unit's nameplate nor the model numbers of the three heads. We therefore avoid arbitrarily assigning a specific capacity to this installation.
The technical table on page 2 presents five FreeMatch R32 outdoor units. The 18,000 BTU model accepts two indoor units, while the following units can power a three-head configuration:
- GWHD(24)ND6MO : rated cooling capacity of 24,000 BTU/h and connection for two to three indoor units;
- GWHD(30)ND6MO : rated cooling capacity of 28,400 BTU/h and connection for two to four units;
- GWHD(36)ND6MO : rated capacity of 36,000 BTU/h and connection for two to four units;
- GWHD(42)ND6MO : rated capacity of 42,000 BTU/h and connection for two to five units.
The right choice depends on more than just the number of heads. We assess the area and volume of each zone, insulation, fenestration, building orientation, air infiltration, and design temperature. A combination of three small heads does not necessarily require the same outdoor unit as three large units installed in open spaces.
Sizing the three zones—not just the entire house
In a centralized system, the total capacity is distributed through the ducts. In a ductless installation, each head must be sized for the room it serves.
An oversized unit can quickly reach the setpoint and then reduce its operation before sufficiently dehumidifying the room in summer. An undersized head may run continuously without maintaining comfort during periods of extreme heat or severe cold.
We therefore analyze each zone separately before approving the final combination. This method helps avoid, among other things:
- a head that is too powerful for a small bedroom;
- a direct and uncomfortable airflow onto a bed or sofa;
- a unit that is too small for a room with extensive glazing;
- an outdoor unit unable to support all three simultaneous demands;
- an unapproved combination by the manufacturer.
The total capacities listed for the indoor units can sometimes exceed the rated capacity of the outdoor unit, provided that GREE permits the combination. This does not mean that all the heads can deliver their maximum output at the same time. The selection should match the building’s actual usage profile.
The stated efficiency of the GREE FreeMatch R32
The supplied technical data sheet states that efficiency can reach 21 SEER2, 12.5 EER2 and 10 HSPF2. It also has an operating range from -30°C to 48°C in cooling mode, in -30°C to 24°C in heating mode, as well as a total line length of up to 100 metres, depending on the outdoor unit.
This data is particularly relevant for a property located in Blainville, where the system must cope with cold winters, rapid temperature changes, and humid summer periods.
Actual performance nevertheless depends on several factors:
- the exact combination of units;
- the quality of the sizing;
- the length of the lines;
- the refrigerant charge;
- the location of the outdoor unit;
- the cleanliness of the filters;
- the requested temperature in each zone.
An appliance with good seasonal efficiency must be properly installed and commissioned to maintain this advantage under real-world conditions.
Inverter technology designed to modulate capacity
GREE introduces the FreeMatch R32 with a technology G10 inverter, intelligent defrosting, self-diagnostics, automatic voltage adjustment, and quiet operation. The specifications also indicate that the indoor units are powered by the outdoor unit and that the platform can be paired with several types of compatible indoor units. An A2L leak detection sensor is also included.
Inverter modulation allows the compressor to adjust its speed according to demand. When the temperature approaches the setpoint, the system can reduce its capacity rather than shutting down completely and restarting a few minutes later.
In a three-head installation, this modulation is particularly useful. Requirements constantly change depending on which rooms are occupied, sunlight exposure, and the selected settings. The outdoor unit can adjust its operation to a single active zone or to several indoor units operating simultaneously.
Technical decisions that protect the performance of a multi-zone installation
The piping route must be calculated before drilling
A clean installation begins well before the units are mounted. We determine the routing of the three refrigerant circuits while taking into account the walls, ceilings, windows, exterior downspouts, and the location of the outdoor unit.
The product line’s specification sheet indicates piping sizes of 1/4 in. for liquid and 3/8 in. for gas. Depending on the outdoor model, the maximum total length ranges from 40 to 100 meters, and the maximum height difference ranges from 15 to 25 meters.
These limits do not mean that it is advisable to systematically use the maximum available. Shorter, better-organized runs reduce detours, unnecessary connections, and the amount of additional refrigerant.
The specification sheet also states that the precharged length varies by outdoor unit. When the actual length exceeds the amount covered by the factory charge, additional refrigerant must be calculated in accordance with the manufacturer’s instructions. An approximate charge can lead to reduced performance or operating problems.
Each indoor unit’s drainage must be checked separately
Each indoor unit produces condensation during cooling. A three-head heat pump therefore has three drains to plan and test.
Whenever the configuration allows, we favor gravity drainage with a continuous slope. The drain must not rise, form a low spot, or be pinched behind the trim. If a condensate pump is necessary, it must be selected and installed to minimize noise and facilitate maintenance.
Before completing the job, we check each drain separately. This step confirms that the water flows properly without backing up into the unit’s drain pan or appearing at the bottom of the wall.
Identifying the circuits prevents communication errors
In a multi-zone system, each indoor unit is associated with a specific refrigerant port and communication wiring. Mixing up two units can cause confusing symptoms: one indoor unit calls for heating, but the outdoor unit sends refrigerant to another circuit; one unit starts even though the control was intended for a different room.
We identify each line during installation. This method simplifies connections, commissioning, and future service work.
The sequence generally includes:
- identifying the three indoor units;
- connecting the lines to the corresponding ports;
- checking the power and communication wiring;
- leak testing;
- vacuuming;
- controlled opening of the valves;
- individual and simultaneous testing of the three heads.
Electrical requirements vary according to the outdoor unit
All models in the table operate at 208/230 V, but their power supplies are not identical. The minimum circuit ampacity ranges from 14.5 to 30 A, while the maximum overcurrent protection ranges from 20 to 45 A depending on capacity.
The circuit breaker and conductor sizes must therefore be selected based on the nameplate of the exact model. It would be incorrect to automatically choose a 30 or 40 A circuit breaker simply because the system has three heads.
We also check the available capacity in the electrical panel and the location of the outdoor disconnect. The technician must be able to shut off the power near the unit before performing maintenance or diagnostic work.
Outdoor noise depends as much on the model as on its location
The specifications indicate an outdoor high-speed sound pressure level ranging from 54 to 63 dB(A) depending on the unit.
In Blainville, where houses can be relatively close together in some areas, the condenser’s location deserves particular attention. Whenever the layout allows, we avoid placing it directly beneath a bedroom window or in a space where two walls could reflect the sound.
The support must be stable, level, and equipped with suitable anti-vibration devices. The outdoor unit must also be raised sufficiently to limit the risk of snow obstruction and allow water produced during defrost cycles to drain.
Commissioning must include all three zones
A head blowing air does not, on its own, confirm that the system has been installed correctly. We must verify the complete response of each zone.
Commissioning includes, among other things:
- heating and cooling operation;
- communication between each head and the outdoor unit;
- damper response;
- fan stability;
- drainage;
- the absence of abnormal noise or vibration;
- consistent supply-air temperatures;
- the simultaneous operation of the units according to the installed combination.
We also explain to the homeowner how to use the three zones. Continuously turning off two heads and requesting an extreme temperature from the third is not always the most efficient strategy. Reasonable and relatively stable settings generally allow the inverter compressor to modulate more effectively.
The filters must remain easy to maintain
The head visible in the photo remains accessible from the front. This accessibility is essential, since the filters must be cleaned regularly.
A clogged filter reduces airflow, increases noise, and may decrease heating or cooling capacity. In a home with three indoor units, cleaning intervals may vary depending on how each room is used, whether there are pets, and the amount of dust.
We recommend checking the filters periodically rather than waiting for an obvious drop in performance. The curtain near this unit should also be kept clean, as fibers and dust can be drawn toward the air return.
Warranty, AHRI certification, and financial assistance
The table on page 2 provides numbers Separate AHRI numbers for ductless, ducted, and mixed combinations. It also presents the range as ENERGY STAR certified.
For a financial assistance application, the AHRI number of the combination actually installed is generally more important than the simple name FreeMatch R32. The outdoor unit, the three indoor units, and their configuration must match the eligible application.
The document also mentions a standard 10-year warranty, with two additional years potentially available through Wolseley when the registration or proof-of-installation requirements are met. It indicates possible eligibility for local rebates, without specifying the program, amount, or conditions applicable to the building in this document.
We therefore verify separately:
- the exact models of the four units;
- the AHRI combination;
- the purchase and installation date;
- the current program criteria;
- the documents to retain;
- warranty registration.
A general statement of eligibility does not, by itself, confirm the amount that will be paid.
The most common mistakes to avoid with a three-head heat pump
Placing a unit solely to hide the lines
The shortest route is not always the best location for comfort. A head must first distribute air throughout the area being served. The routing of the lines must then be adapted to that location, not the other way around.
Installing the head too close to a curtain
Even when a curtain does not obstruct the unit during installation, its movement must be anticipated. The fabric must not enter the air intake or float in front of the louver.
Choosing BTUs based on an approximate rule
Square footage alone is not enough. A south-facing room, a top floor beneath the roof, or a large glazed area may require a different approach from a well-insulated interior bedroom.
Forgetting that the three heads share the outdoor unit
The nominal capacity of the heads does not add up like three independent units. The outdoor unit distributes its capacity among the active zones.
Neglecting drains and vacuuming
An attractive finish does not compensate for improperly sloped drainage, a leak, or moisture left in the lines. These invisible steps are decisive for reliability.
Promising a rebate before confirming the combination
The series name is not enough. The AHRI number, indoor models, and program criteria must be verified before announcing a specific financial incentive.
An installation adapted to the room’s actual constraints
This installation of GREE multi-zone heat pump in Blainville shows the importance of interior details. The visible head unit is installed high enough to free up wall space, while leaving the clearance required for air intake. The curtain remains to the side. The louver directs airflow toward the open part of the room. The trim protects the lines while maintaining a discreet appearance.
These decisions seem simple once the work is complete. Yet they require coordination between air distribution, drainage, refrigerant-line routing, maintenance access, and the existing layout.
At AirGreen, we apply the same level of rigor to our installations of heat pumps in Montreal, and multi-zone systems with Laval, in wall-mounted air conditioners in Longueuil, as well as our projects involving North Shore and the South Shore. Our goal remains to select the right combination, position each head according to the needs of its zone, and deliver a system that remains accessible, stable, and consistent after commissioning.
With three zones powered by a single outdoor unit, GREE FreeMatch R32 offers a particularly interesting solution for homes where rooms have different needs. Comfort quality nevertheless depends on the project as a whole: load calculation, head-unit placement, line routing, electrical supply, drainage, refrigerant charge, and final adjustments.