HITACHI airHome Multi 4-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)

Reliable multi-zone solutions for Montreal and its greater region

At AirGreen, we install the HITACHI airHome Multi 4-zone wall-mounted heat pump (42,000 BTU compressor) to provide precise HVAC comfort in Montreal homes — apartments, condos, duplexes/triplexes, townhouses — as well as in Laval , Longueuil , the North Shore and the South Shore . This multi-split system can power up to four indoor units (and up to five in total) with a single R-32 outdoor compressor, giving each room its own temperature, fan speed and schedules.

The multi-zone designed for Montreal apartments and plexes

Our teams regularly encounter the same needs: a large living space upstairs, closed bedrooms, sometimes a mezzanine office, or a basement that needs reinforcing. The HITACHI airHome Multi 42,000 BTU meets this profile exactly. We balance the load between zones, reduce "hot/cold spots," and maintain control over energy consumption thanks to independent settings per room. For a 4 1/2, 5 1/2, or plex typical of the Plateau, Rosemont, Verdun, or Villeray, it's an architecture that works—summer and winter.

Key points to remember

• Up to 5 rooms powered from a single RAM-G42N5HAA outdoor compressor ; individual control of each head (setpoint, speed, mode).

• Heating operating range down to –20°C , suitable for our winters.

• Seasonal efficiency up to SEER2 23.0 and HSPF2 up to 9.2 (Region 4) , robust performance in Region 5 for our northeastern climate.

• Enhanced air quality : PM2.5 Active Carbon filters, FrostWash technology (self-cleaning of the exchanger), Mold Guard after each cooling/drying cycle.

• R-32 leak detection integrated into indoor units with visual/audible alert; airCloud Go (Wi-Fi) and airPoint Room H700 (wired) control options.

• Careful silence : exterior sound pressure announced at 58 dB(A) in 42,000 BTU; interiors typically 27–35 dB(A) depending on models and speeds.

• Generous refrigeration hydraulics for our complex construction sites: total piping length up to 262 ft (80 m) and total elevation difference up to 75 ft (23 m) , practical for roofs and building column passages.

What we actually install in your home

Common Zone Combinations

• 12 + 12 + 12 + 12

• 12 + 12 + 12 + 18

• 12 + 12 + 12 + 24

• 12 + 12 + 18 + 18

We select the power of each head according to the surface area , insulation , solar orientation , ceiling height and use (bedroom, open area, office). For example:

• Well-insulated enclosed room of 100–200 sq ft → 9,000 to 12,000 BTU .

• Large open living room/kitchen area of ​​350–550 sq ft with windows or high ceiling → 18,000 to 24,000 BTU .

Choosing airHome indoor units

Depending on the configuration, we offer:

• airHome 400 wall units (simplicity, easy maintenance) or 650 (presence sensors, automatic savings).

• 22" x 22" mini-cassette for suspended ceilings (recent businesses/condos).

• “Floor” console ideal as a replacement for a window air conditioner or convector.

• Invisible ducts to preserve aesthetics.

The 400/650 series incorporate a PM2.5 filter and FrostWash ; the 650 adds a motion sensor that switches to Smart Eco or Auto-Off mode when the room is unoccupied—useful for reducing your annual bill.

Performance and key figures (useful summary)

• Nominal cooling capacity : 42,000 BTU/h (typical range 7,000–46,000 depending on demand and heads).

• Nominal heating capacity : 45,000 BTU/h (range 9,000–51,000).

• EER2 up to 12.5 ; SEER2 up to 23.0 ; HSPF2 up to 9.2 (R4) / approx. 7.2 (R5 for 42k unsheathed) .

• Power supply : 208–230 V, 1 Ph, 60 Hz .

• Refrigerant : R-32 low GWP, optimized charge.

• Outdoor unit noise level : ~ 58 dB(A) .

• Lengths/heights : total 262 ft , inter-unit 82 ft , total elevation 75 ft .

Practical note: efficiency indices vary depending on the climate region , the combination of heads , the length of the lines , the installation and daily use . During our visit, we validate the sizing for Montreal, Laval, Longueuil, North Shore and South Shore in order to achieve the announced performances.

Air Quality and HVAC Maintenance

In a Montreal building, the sources of indoor pollutants (kitchen, occupants, furniture, dust) are real. airHome units integrate:

• FrostWash : A frost/defrost cycle that sanitizes the exchanger and maintains airflow over time.

• Mold Guard : Internal drying of approx. 60 min after cold/dry modes to limit odors and mold .

• PM2.5 Active Carbon and ViroSense S filters: action against fine particles and VOCs , inhibition of viruses/bacteria announced by the manufacturer.

For HVAC maintenance , we recommend:

• Vacuum/light clean filters every 4–8 weeks depending on dust.

• Annual professional maintenance (R-32 pressure/charge, evaporator/condenser cleanliness, condensates).

• Check drain slopes , line insulation, and outdoor coil (debris, leaves) before winter.

Recent case studies by AirGreen

Apartment in Outremont (open space + 3 bedrooms)

• Layout : 18k (living room/kitchen) + 12k (master bedroom) + 9k + 9k.

• Constraints : evacuation to rear roof, drop ~48 ft , space saving on balcony.

• Result : better heating performance at –15°C; reduction of approximately 23% in estimated consumption over 4 winter months compared to their electric baseboards (monitored via bills/thermostats).

• Installation tip : use anti-vibration supports and heated condensate outlet to prevent freezing.

Duplex in Laval (Vimont)

• Configuration : 24 k (open area ground floor) + 12 k (office) + 12 k (bedroom).

• Objective : comfort during the day for teleworking, noise reduction on the terrace side.

• Result : 650 wall unit with Smart Eco in the office; automatic switch-off after 30 minutes of vacancy → savings measured over 60 days of approximately 15–18% compared to a previous manual mode.

Condo in Longueuil (downtown)

• Configuration : 12k mini-cassette in open area + 9k bedroom + 9k office.

• Advantage : uniform 4-way blowing without encroaching on the walls, ideal under 2'x2' suspended ceiling.

• Result : temperature uniformity (reduced difference of ~2°C between kitchen and living room during peak summer hours).

HVAC installation: our AirGreen best practices

• 100% free on-site preliminary study : taking measurements, refrigerated transport, electricity, drilling.

• Transparent prices : we send a final offer before work; no deposit , payment is made at the end when you are satisfied.

• Careful installation : brazing under nitrogen, deep vacuum, leak testing, continuous insulation of lines, clean management of condensates (drain heating if necessary).

• Winter at –20°C : we validate the heating sizing and recommend, if necessary, a targeted top-up in very glazed rooms.

• Controls : Getting started, explaining modes , basic programming, help with Wi-Fi connection if you opt for airCloud Go .

Quick FAQs

Is this 42,000 BTU heat pump suitable for a large 6 1/2?
Often yes, provided you have a head of 18–24 k for the open area and 9–12 k in the rooms. We check the insulation, height and sunlight.

Can I cut off one head and leave the others active?
Yes. Each indoor unit is controlled independently , with its own setpoint and ventilation.

What about outside noise in the backyard?
The 42k group typically displays 58 dB(A) . We choose locations and supports that minimize transmission to neighbors.

Is there an app to schedule time slots?
Yes, via airCloud Go (optional Wi-Fi adapter); you can plan, monitor and optimize.

Grants and procedures

The provincial grant (LogisVert) indicated at $1,500 (updated: May 1, 2025) applies according to eligibility criteria. We help you prepare the file and gather the required documents. For Montreal, Laval, Longueuil, North Shore and South Shore , we confirm eligibility during the estimate.

Why AirGreen for your multi-zone installation?

• Team of experienced refrigeration engineers in multi-split on roofs, brick walls, technical duct passages.

• Residential and commercial construction sites throughout Greater Montreal.

• Responsive after-sales support , parts and service available.

• Quality commitment : precise sizing, methodical installation, clean finish.

NEXT STEP

Ready to stabilize comfort room by room? Contact AirGreen for a 100% free on-site estimate in Montreal , Laval , Longueuil , on the North Shore and the South Shore .
Phone: 514-316-2973 · Email: sales@airgreen.ca · 4951 Sainte-Catherine Street East, Montreal
We plan your visit, suggest the optimal configuration , and carry out a clean, fast and guaranteed satisfactory installation upon completion of the work.