HITACHI airHome Multi 2-Zone Wall-Mounted Heat Pump | 24,000 BTU Compressor

A multi-zone solution designed for Quebec homes that want room-by-room comfort

Installing a 2-zone wall-mounted heat pump is not just a way to air condition two rooms. It's a much more precise way to manage the comfort of a house, condo, duplex, or multi-generational dwelling where needs vary from one space to another. The HITACHI airHome Multi 2-Zone Wall-Mounted Heat Pump with 24,000 BTU compressor precisely addresses this reality: a single outdoor unit, two possible indoor units, independent temperature management, and performance adapted to Quebec winters.

At AirGreen, we offer this type of system when the client wants to avoid installing two outdoor compressors while achieving distinct comfort in two key areas. In Montreal, for example, we often see this need in renovated duplexes, townhouses, two-level condos, and properties where outdoor space is limited. In Laval, on the North Shore, in Longueuil and on the South Shore, this type of configuration is also highly sought after to serve a living room and a master bedroom, a ground floor and a basement, or an open-plan area and a closed office.

The outdoor model RAM-G24N3HAA is designed to offer a nominal capacity of 24,000 BTU for air conditioning and heating, with the possibility of connecting up to 3 indoor units, even if the configuration presented here is optimized for 2 zones. This flexibility is particularly interesting for an owner who wants to start with two wall-mounted units, while keeping room for planning a future third zone, when technically feasible.

The system uses R-32 refrigerant, a technology now favored for several high-performance residential HVAC equipment. It is also ENERGY STAR® and ENERGY STAR® Cold Climate recognized, an important point for customers looking for an efficient wall-mounted heat pump in Quebec, where heating periods are long and temperature variations are significant. According to the information available for this product, the indicated LogisVert provincial subsidy is $1,920, updated as of November 26, 2025, which reinforces the financial interest of the model for owners planning an eligible HVAC installation.

Why a 2-zone heat pump truly changes daily comfort

In a classic house, not all rooms react the same way to heat, sun, wind, or occupancy. A south-facing bedroom can become uncomfortable in the afternoon, while a basement remains cool. An office used all day does not have the same needs as a bedroom used mostly at night. With a 2-zone wall-mounted heat pump, each indoor unit has its own set point, its own fan speed, and its own settings.

This independence is one of the greatest advantages of the HITACHI airHome Multi system. A single outdoor unit can power several indoor units, and each zone can be controlled separately. In summer, the system operates in air conditioning mode and allows the indoor units to be used in cooling, dehumidification, or ventilation mode. In winter, the system operates in heating mode, with management adapted to active zones.

In a recent project in Rosemont–La Petite-Patrie, a client wanted to air condition their open-plan living room and kitchen, while improving the comfort of the master bedroom located at the back of the dwelling. The challenge was not just about power. It was necessary to avoid oversizing a single wall unit in the living room, which would have created short cycles and uneven comfort. The 2-zone solution allowed for better air distribution, limited temperature differences, and a more discreet outdoor installation.

In another case in Boucherville, on the South Shore, the house had a very bright main floor and a basement used as an office. The family did not want to unnecessarily heat or cool both spaces to the same level all day. A multi-zone configuration allowed for adapting usage according to the actual schedule: the office on weekdays, the living area in the evening, both zones during periods of intense heat.

Technical data that matters during an installation in Montreal, Laval, or Longueuil

The product sheet indicates a cooling capacity of 24,000 BTU, an operational heating capacity down to -20 °C, a voltage of 220 V, a minimum circuit ampacity of 19 A, and a maximum overcurrent protection of 35 A. This information is essential before any installation. A professional HVAC installation never begins with the mounting of the wall unit; it begins with the validation of the electrical panel, the refrigerant piping route, outdoor clearances, condensate drainage, and the best position for the indoor units.

The outdoor unit dimensions are 33.5 x 11.7 x 31.5 in, with an outdoor sound pressure level of approximately 54 dB(A). For compatible wall-mounted indoor units, the sound level may vary depending on the chosen capacity, with an indication around 30 to 42 dB(A) depending on the selected model. In practice, this data is important for bedrooms, offices, and rooms where silence is a priority.

Available combinations include several indoor capacities, notably:

• 7,000 + 7,000 BTU
• 7,000 + 9,000 BTU
• 7,000 + 12,000 BTU
• 7,000 + 18,000 BTU
• 9,000 + 9,000 BTU
• 9,000 + 12,000 BTU
• 9,000 + 18,000 BTU
• 12,000 + 12,000 BTU
• 12,000 + 18,000 BTU

This variety allows for a more accurate design. A bedroom does not always need a 12,000 BTU unit. In several Montreal condos, a 7,000 BTU or 9,000 BTU head may be more suitable, especially when the room is well insulated. Conversely, an open-plan area with kitchen, living room, and staircase may require a higher capacity. AirGreen's role is precisely to perform this analysis before recommending a combination.

What the Hitachi brochure adds to the product analysis

The official brochure presents the airHome Multi system as a multi-zone heat pump solution with Inverter technology, capable of air conditioning and heating up to five rooms depending on the chosen outdoor model, with the possibility of combining several types of indoor units. It also highlights advanced filtration, smart control options, heating operation down to -20 °C, as well as durability features such as anti-corrosion blue fins and an outdoor casing with anti-rust paint.

For the RAM-G24N3HAA model, the brochure indicates a nominal cooling capacity of 24,000 BTU/h, a nominal heating capacity of 24,000 BTU/h, a heating range down to -20 °C, R-32 refrigerant, an outdoor sound level of 54 dB(A), and a maximum total piping length of 200 ft depending on installation conditions. These elements confirm that the product is designed for serious residential projects, where design quality is as important as the chosen brand.

Air quality: an often underestimated advantage in choosing a heat pump

Customers first seek thermal comfort: cooler in summer, more stable in winter. However, indoor air quality quickly becomes a decisive factor, especially in well-insulated homes where air circulates less naturally. The HITACHI airHome Multi range highlights several air cleanliness technologies, including PM2.5 activated carbon filtration on some units, ViroSense S filter on some configurations, and FrostWash technology.

The FrostWash function relies on a freezing and thawing process aimed at cleaning the heat exchanger coil. The goal is to reduce the accumulation of contaminants and mold in the indoor unit. For homeowners, this does not replace professional HVAC maintenance, but it helps maintain better airflow and a longer-lasting feeling of freshness between services.

The Mold Guard function, also presented in the documentation, helps reduce odors and mold formation by drying internal components after air conditioning or dehumidification cycles. In Montreal dwellings where summer humidity can become heavy, or in some basements in Laval, Longueuil, on the North Shore, and on the South Shore, this function can make a real difference in the daily experience.

Smart control, optional WiFi, and wall thermostat

WiFi is indicated as optional for this model. This means that customers who wish to control their system remotely can add a compatible interface, notably with the airCloud Go application, depending on the chosen configuration. This type of control allows for programming operations, adjusting settings remotely, and better monitoring system usage.

For some clients, especially in rental properties or multi-generational homes, we sometimes recommend also evaluating the possibility of a compatible wall thermostat. The brochure notably mentions the airPoint Room H700 option and possible connectivity with a third-party thermostat in some cases. However, it is important to understand that a generic thermostat does not always allow the use of all advanced features of the system. During an estimate, we clearly explain the advantages and limitations of each approach.

Mistakes to avoid before buying a 2-zone wall-mounted heat pump

A multi-zone heat pump offers many possibilities, but it must be well designed. Poor capacity selection or incorrect unit positioning can harm performance, comfort, and durability. Here are the mistakes we most often encounter during replacements or corrections of existing installations:

1. Choosing two overly powerful indoor units
   An overly powerful unit can quickly reach the desired temperature without properly dehumidifying the air. Result: a cool but uncomfortable room.
2. Ignoring the solar orientation of rooms
   A south or west-facing bedroom may require a different strategy than a north-facing bedroom.
3. Underestimating the piping route
   The system accepts long lengths, but every foot of piping must be carefully planned: drain slope, mechanical protection, accessibility, aesthetics, and compliance.
4. Placing the outdoor unit without thinking about winter
   In Quebec, snow, ice, clearance around the compressor, and defrost management are essential points.
5. Comparing only the price
   Two quotes may show the same product, but not include the same level of finish, the same support, the same protections, the same care in commissioning, or the same quality of after-sales service.

At AirGreen, we pay particular attention to vacuum drawing, checking connections, protecting lines, condensate drainage, communication with the client before work, and final commissioning. A well-executed HVAC installation protects the investment and limits avoidable service calls.

An AirGreen installation: technical precision, clean finish, and post-installation support

How we evaluate the right 2-zone configuration

Before recommending the HITACHI airHome Multi 2-Zone Wall-Mounted Heat Pump | 24,000 BTU Compressor, we analyze several factors:

• actual floor area of rooms;
• ceiling height;
• insulation level;
• sun exposure;
• number of occupants;
• type of windows;
• room usage;
• electrical constraints;
• possible compressor position;
• distance between indoor and outdoor units;
• desired aesthetics;
• eligibility for available subsidies.

This step allows for a coherent combination to be proposed. For example, a 9,000 + 12,000 BTU configuration may be suitable for a condo with an open living room and a master bedroom. A 12,000 + 18,000 BTU configuration may better suit a house with a large open area and a separate floor. A 7,000 + 9,000 BTU configuration may be more appropriate for two bedrooms or an office and a bedroom.

A solution adapted to residential and light commercial spaces

Even if this product is often chosen for residential use, certain configurations can also be relevant in small professional premises, home offices, consultation rooms, treatment rooms, or premises divided into two zones. In Longueuil and on the South Shore, we are seeing more and more small building owners looking for compact, efficient, and aesthetic solutions, capable of managing two independent spaces without multiplying outdoor equipment.

One of the advantages of the Hitachi system is the possibility of combining different types of indoor units in the multi-zone family, depending on compatible models: wall-mounted units, floor consoles, mini-cassettes, or ducted units. In the case of this product page, the wall-mounted version remains the simplest, most common, and often the most advantageous option in terms of installation cost.

Warranty and peace of mind

The data sheet indicates a warranty of 10 years on the compressor, 10 years on parts, 0 year on labor, with the possibility of an extended warranty. The Hitachi brochure also mentions different manufacturer warranty protections depending on registration and applicable conditions. For customers, it is important to distinguish between the manufacturer's warranty on parts and the labor warranty offered or extended by the contractor.

At AirGreen, we clearly explain what is included before installation. We send a final offer before starting the work to avoid surprises. We want the customer to understand the product, installation, options, and limitations before making their decision.

HVAC Maintenance: Essential for Preserving Performance

Even with features like FrostWash and Mold Guard, regular HVAC maintenance is still recommended. Filters must be cleaned, coils inspected, drains checked, and performance controlled. A multi-zone system has several indoor units; each zone must therefore be considered in the maintenance plan.

Proper maintenance helps to:

• maintain good airflow;
• reduce odor risks;
• prevent drainage problems;
• preserve energy efficiency;
• detect anomalies before they become costly;
• extend equipment lifespan.

In Montreal, Laval, Longueuil, on the North Shore and the South Shore, we generally recommend annual maintenance, especially for systems used for air conditioning in summer and heating during cold periods.

For which customer is this model particularly interesting?

The HITACHI airHome Multi 2-Zone Wall-Mounted Heat Pump with 24,000 BTU compressor is particularly suitable for owners who want to:

• air condition and heat two rooms with a single outdoor compressor;
• avoid the clutter of multiple outdoor units;
• obtain independent temperature management;
• choose a recognized brand with serious multi-zone technology;
• benefit from an R-32 system;
• aim for a solution eligible for incentives like LogisVert, when program conditions are met;
• prepare for a possible extension to a third zone, if the configuration allows;
• improve comfort while maintaining a clean and discreet installation.

This model is also relevant for owners who want a durable solution without necessarily seeking the most complex options. It offers an interesting balance between performance, flexibility, efficiency, and ease of use.

Why choose AirGreen for this type of installation?

A multi-zone heat pump requires more planning than a simple wall-mounted system. Piping lengths, indoor capacities, condensate drainage, compressor access, penetrations, outdoor protection, and commissioning settings must be precisely coordinated.

At AirGreen, we are accustomed to working in a wide variety of contexts: plexes in Montreal, condos in Laval, single-family homes on the North Shore, renovated properties in Longueuil, family residences on the South Shore, and buildings with access constraints in Montérégie. This experience allows us to offer installations that consider not only the product but also the reality of the building.

Our goal is simple: install the right system, in the right place, with a clean finish, a clear explanation, and reliable after-sales service. For a 2-zone wall-mounted heat pump, this rigor makes all the difference.

Request an estimate for your Hitachi airHome Multi project

If you are considering installing a HITACHI airHome Multi 2-Zone Wall-Mounted Heat Pump | 24,000 BTU Compressor, contact AirGreen for an evaluation tailored to your property. We serve Montreal, Laval, Longueuil, the North Shore, the South Shore and surrounding areas, with HVAC solutions designed for the real comfort of Quebec homes.

Call AirGreen today for a quote, a consultation, or more information on this Hitachi multi-zone model and its installation options.