HITACHI airHome Multi Dual Zone Wall-Mounted Heat Pump | 42,000 BTU Compressor

• BROCHURE FRANÇAIS
• BROCHURE ENGLISH

• WiFi: Optional
• Warranty (Compressor - Parts - Labor): 10-10-0 years
• Additional Warranty (10-10-10): Possible
• Voltage: 220 V
• Sound Pressure Level (Outdoor): 58.0 dB(A)

A DoubleZone designed for the Montreal climate: strong, agile and designed for the comfort of each room

Why this DoubleZone HITACHI airHome Multi appeals to our customers in Montreal, Laval, Longueuil, North Shore and South Shore
At AirGreen, we recommend the DoubleZone wall-mounted heat pump with the 42,000 BTU compressor (RAM-G42N5HAA) for homeowners who want to cool and heat two separate zones with a single outdoor unit. This multi-split system combines energy efficiency (SEER2 up to 23.0, HSPF2 up to 7.85) , **reliable heating down to –20°C , R-32 refrigerant , and mix & match compatibility with several types of indoor units (wall-mounted, cassette, floor/console, ducted) to finely adapt to the architecture of your home. These elements are illustrated in the technical table (page 4) and the feature sheets (pages 2–3) of the official HITACHI brochure.

Choose the configuration of your 2 zones intelligently

Indoor unit combinations available

The 42,000 BTU RAM-G42N5HAA compressor accepts 2 to 5 units, but in DoubleZone we pair 2 heads depending on the size and use of the rooms:

• airHome 400 / 650 wall units : 7k, 9k, 12k, 18k, 24k BTU (quiet down to 27–29 dB(A) for some sizes, easy maintenance, motion sensor on 650 )

• Floor console (airHome Floor) : 7k to 18k BTU (ideal replacement for a convector or window air conditioner, 22 dB(A) at its lowest)

• 4-Way Mini Cassette : 7k to 20.5k BTU (22"x22" ceiling, uniform flow over large areas)

• Ducted : 7k to 24k BTU (invisible, perfect when you want to preserve the design)

Good AirGreen reflex : we evaluate the building envelope, the orientation, the solar gains and the actual use of each room. In an open-plan living room/kitchen of 30–40 m² with large windows, we will favor 18k–24k BTU . For a well-insulated closed bedroom , 7k–9k BTU is generally sufficient. The advantage of multi-zone is to size each zone as precisely as possible, not to install two "12k" by default.

Examples of DoubleZone configurations that work

• 9k + 18k : condo in Griffintown with open concept west side + master bedroom. Result: rapid cooling in summer, stable heating in winter, while moderating exterior noise.

• 12k + 24k : townhouse in Rosemont—La Petite-Patrie with finished basement. The 24k manages the open ground floor area; the 12k stabilizes the upper floor (two bedrooms).

• 7k + 12k (console + wall) : plex in Villeray where aesthetics prevail. A discreet console under the front window, a 12k wall unit on the kitchen side.

What you earn daily

Precise comfort, room by room

Each indoor unit has its own setpoint, fan speed, and schedules . You can turn off one zone when it's not in use, while the other is working. This granularity improves comfort and reduces consumption .

Healthier air and easier maintenance

HITACHI units incorporate technologies that we like to see in Montreal and surrounding areas where indoor air can be loaded with fine dust:

• FrostWash : Frosts/defrosts the coil to sanitize the exchanger and maintain airflow.

• Mold Guard : Automatic drying cycle ~60 min after cold/dry to counter summer humidity and odors .

• PM2.5 / ViroSense S filters : traps fine particles and inhibits viruses/bacteria, useful for traffic areas and bedrooms.

• R-32 leak sensor : visual/audible alarm in case of refrigerant anomaly.
  These elements appear on pages 2–3 of the brochure (diagrams and pictograms).

Energy management and saving

• Presence sensor (Smart Eco / Auto-Off) : automatically lowers consumption when the room is empty (page 3).

• airCloud Go (optional) : Wi-Fi control for scheduling, energy tracking, and remote adjustments—handy if you own a cottage or rent short-term.

• Multi-split mode : the compressor adapts its power to the demands of the two zones, limiting on/off cycles and extending its lifespan.

The numbers that matter for an urban northern climate

Key Technical Data of the 42,000 BTU Compressor (RAM-G42N5HAA)

• Nominal Cooling : 42,000 BTU/h (7,000 to 46,000 BTU/h)

• Nominal heating : 45,000 BTU/h (9,000 to 51,000 BTU/h)

• Continuous heating down to –20°C

• SEER2 up to 23.0 – HSPF2 up to 7.85

• Power supply : 208–230 V / 1Ø / 60 Hz

• External noise level (high) : 58 dB(A)

• Refrigerant : R-32

• Total piping length : up to 262 ft (80 m)

• Total elevation gain : up to 23 m

• External dimensions : 37.4 × 14.6 × 37.2 in

• ENERGY STAR® : Yes (general category), Cold Climate : No

• AHRI : 215827114
  These values ​​come from the technical table (page 4) of the AirGreen brochure and product sheet .

When these numbers make the difference

• Outside noise : 58 dB(A) on a rear balcony of the Plateau is acceptable, especially if the supports are separated and the distance from the neighbors' windows is respected.

• –20°C : Montreal experiences cold peaks ; the unit continues to heat, but the sizing of the heads and the start-up strategy (pre-heating, holding) remain essential to avoid temperature dips.

• 262 ft of lines : useful for narrow buildings with compressor in the backyard and heads on the 2nd/3rd; we always validate the diameters, elbows, and oil according to the actual lengths.

Three AirGreen case studies (summarized)

1) New condo in Longueuil – “open concept + bedroom”

• Config : 18k (living room/kitchen) + 9k (bedroom) – two airHome 650 wall units.

• Issue : large west-facing windows, summer overheating.

• Result : 2°C faster lowering when returning home, Eco mode active during the day, reduced exterior noise pollution after installation on silent blocks.

2) Century-old house in Outremont – “aesthetics vs. comfort”

• Config : 12k floor console (front living room) + 18k mini-cassette (rear kitchen).

• Challenge : preserve the moldings and avoid visible murals.

• Result : uniform 4-way diffusion on the ground floor, effective dehumidification in the kitchen during heat waves.

3) Triplex Ahuntsic – “two apartments, one yard”

• Config : 24k (main accommodation on ground floor) + 12k (office in basement).

• Challenge : long refrigerated routes and uneven terrain.

• Result : compliant installation thanks to the max 80 m piping , nitrogen leak tests , commissioning and measurement of overheating to validate the R-32 charger.

AirGreen Installation Best Practices

Electricity & protection

• The device operates on 220 V (208–230 V). We size the circuit breaker and wiring according to the actual configuration (run length, panel constraints).

• 4/5 wire communication between units, condensate drainage by gravity or pump when necessary.

Compressor installation

• Wall mount or floor stand depending on vibrations and service access.

• Clearance for air exchange (blowing/suction) and maintenance access.

• Snow management : deflector and ground clearance recommended on the North Shore / windy areas .

Commissioning

• Calibrated flares , nitrogen brazing , triple vacuum up to <500 microns, additional load weighing if lengths exceed the standard.

• Check overcurrent , voltages , R-32 leak via sensor, drainage under load.

• Wi-Fi airCloud Go setup (if added) and Eco profile according to schedule.

Common Mistakes to Avoid (and How We Prevent Them)

• Oversizing heads “to be safe”: leads to mid-season cold airflow and short cycles.

• Underestimate the heating load of an open area with a mezzanine: we favor a stronger head or a wall + cassette mix .

• Refrigeration path too long without recalculation: capacity losses; we check the equivalent length (elbows, heights), adjust the load and validate with the pressure gauge .

• Ceiling installation of a mural : obstruction, deceived sensors, accentuated stratification .

• No maintenance plan : Even with FrostWash and Mold Guard , annual cleaning extends performance and air quality.

Express FAQ

Is this DoubleZone suitable for a new home on the South Shore?
Yes, especially in open plan + bedroom/office . The 42k provides power reserve and flexibility to expand later (up to 5 zones if desired).

Can I combine a wall light and a cassette?
Yes. The mix & match system allows for room optimization (pages 2–3 of the HITACHI document).

Does it still work at -20°C?
Yes: the compressor keeps the heating continuously at -20°C . The important thing is to adapt the size of the heads and the instructions for very cold nights.

Is Wi-Fi included?
The airCloud Go module is optional . We can install it during commissioning.

Why entrust your project to AirGreen?

• 100% free on-site diagnosis : our refrigeration engineers assess thermal load, air circulation and installation constraints.

• Transparent final offer before work: clear price , schedule , and choice of validated components .

• Experienced installation teams : installation, commissioning, adjustments and usage advice.

• Responsive after-sales service : availability in Montreal, Laval, Longueuil, North Shore, South Shore .

Product specifications (useful summary)

• Outdoor model : RAM-G42N5HAA

• Zones : 2 (expandable up to 5) – possible combinations : 7+7; 7+9; 7+12; 7+18; 7+24; 9+9; 9+12; 9+18; 9+24; 12+12; 12+18; 12+24; 18+18; 18+24; 24+24

• Compatible indoor units (examples) : RAK-DJ07QHAA, RAK-DJ09RHAA, RAK-DJ12RHAA, RAK-DJ18RHAA, RAK-DJ24RHAA, RAK-GJ07QHAA, RAK-GJ09QHAA, RAK-GJ12QHAA, RAK-GJ18QHAA, RAK-GJ24QHAA

• Refrigerant : R-32 – leak sensor integrated on indoor units (LED alarm + buzzer)

• Air Features : FrostWash , Mold Guard , PM2.5 / ViroSense S filters

• Control : airCloud Go (Wi-Fi) optional

• Power supply : 208–230 V / 1Ø / 60 Hz

• External noise : 58 dB(A)

• External dimensions : 37.4 × 14.6 × 37.2 in

• ENERGY STAR® : Yes (general) – Cold Climate : No

Ready to get precise room-by-room comfort?
Contact us for your 100% free on-site estimate in Montreal, Laval, Longueuil, North Shore and South Shore . Our team will offer you the most efficient DoubleZone configuration for your home, with a transparent price and careful installation .
Phone : 514-316-2973 • Email : sales@airgreen.ca