HITACHI airHome 400 Wall-Mounted Heat Pump | 24,000 BTU - Sale & Installation

• BROCHURE - FRANÇAIS
• BROCHURE - ENGLISH

• WiFi: Optional
• Warranty (Compressor - Parts - Labor): 10-10-0
• Additional Warranty: Possible
• Piping: 1/4 - 5/8
• Voltage: 220 V
• Sound Pressure Level (Outdoor): 53.0 dB(A)
• Sound Pressure Level (Indoor): 36 / 51 dB(A)

A reliable, simple and effective solution for winters here

At AirGreen, we install the HITACHI airHome 400 – 24,000 BTU wall-mounted heat pump for building owners and managers in Montreal , Laval , Longueuil , on the North Shore and the South Shore who want a high-performance, quiet and economical HVAC machine, without daily complications. This model stands out for its constant thermal output down to -21 °C in heating , its R-32 refrigerant , its SEER2 of 18.3 and its HSPF2 of 10.0 in region 4 - a relevant balance between comfort, energy efficiency and total cost of ownership. According to the official technical data sheet (performance table), there is also an indoor noise level of 36 to 51 dB(A) , 53 dB(A) on the outdoor unit side and a dehumidification flow rate of up to 3.3 L/h for larger sizes; Wi-Fi and wall thermostats are available as options, as are Eco Mode , GoodSleep , FrostWash™ (self-cleaning of the exchanger), Mold Guard (mold prevention) and PM2.5 activated carbon filter functions.

Designed for the real needs of Greater Montreal residences
We see three recurring expectations during the estimation visits: 1) reliable heating in the off-season and in moderately cold weather, 2) uniform cooling in open areas, 3) a discreet noise level for living rooms or bedrooms. The airHome 400 | 24,000 BTU meets these challenges thanks to its DC Vector Inverter compressor , capable of very finely modulating its speed: the machine quickly increases in power, then stabilizes at the set point while consuming just the necessary energy. Result: fewer jolts, a more stable temperature and a better controlled electricity bill.

Why choose the airHome 400 | 24,000 BTU for your home

1) Capacity suitable for open areas and simplified multi-zones

The 24,000 BTU is ideal for:

• open-plan living areas (living room/kitchen/dining room from 800 to 1,100 sq. ft. depending on the envelope and sunlight);

• duplex/triplex dwellings where the main floor is to be stabilized;

• local businesses (offices, clinics, small waiting rooms) requiring a single, robust refrigeration load.

In our load calculations (simplified method based on envelope, orientation, glazing and infiltration), 24k often turns out to be the "sweet spot" for a large Montreal brick ground floor, 8–9 ft ceiling, with constant occupancy.

2) Performance and comfort in cold weather in Quebec

• Nominal heating at -8°C: 17,500 BTU/h , with capacity maintenance at -15°C (maximum value) and continuous operation down to -20.5°C (heating operating range). This data explains why, in practice, many customers reduce the use of their baseboards and maintain a comfortable home in autumn/winter without overconsumption.

• The HSPF2 10.0 (region 4) demonstrates good seasonal efficiency; combined with Eco Mode , it helps limit peak demand in the evening, useful for flexible tariffs.

3) Indoor air quality and easy maintenance

The 400 series focuses on preventive rather than corrective functions:

• FrostWash™ : freeze/thaw cycle that loosens dust from the heat exchanger and evacuates it, helping to maintain aerodynamic performance over the months.

• Mold Guard : drying and heating of the coil (~50°C) after shutdown to prevent mold growth and odors .

• PM2.5 filtration with activated carbon : reduction of fine particles and VOCs , appreciated in homes overlooking busy roads.

• Service access : removable side covers, removable condensate tray, robust deflectors, removable motor support; everything is designed for rapid maintenance , therefore less costly in the long term.

4) Silence and control

• 36–51 dB(A) indoors depending on speed, 53 dB(A) outdoors: suitable for bedrooms , home offices and tight alleyways.

• GoodSleep modulates ventilation and setpoint during the night; airCloud GO (optional) and airPoint H700 (optional) offer weekly programming , cost estimation , mobile control and voice assistants , with internal Wi-Fi adapter (optional).

5) Key technical data (24 k)

• Refrigerant : R-32 .

• SEER2: 18.3 ; EER2: 12.0 .

• HSPF2 (Region 4/5): 10.0/8.0 .

• Operating range : cooling -18 to 46°C , heating -20.5 to 24°C .

• Dimensions (int.): 41.34 × 10.04 × 11.57 in ; (ext.): 37.41 × 14.57 × 37.20 in .

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

• Piping : 1/4" – 5/8" (liquid/gas).

• Model Numbers : RAK-DJ24RHAA (int.), RAC-DJ24WHAA (ext.).

• AHRI : 216759658 .

• ENERGY STAR® : Yes (Cold Climate: No).

• Sound levels : 36/51 dB(A) (int./max), 53 dB(A) (ext.).

• Dehumidification : up to 3.3 L/h (depending on size).

How we install it correctly (and what it means for you)

Sizing and positioning

• 100% free on-site study : we check the envelope , glazing , occupancy , electricity (MCA/MOP), channel routing and condensate drainage .

• Height and orientation of the indoor unit: we avoid stuffy niches and favor longitudinal diffusion in open areas.

• Outdoor unit : clearances, anti-vibration base/slabs , snow management (snow guard available), defrost drain and distance from neighbors for minimal perceived noise .

Refrigeration & electrical connections

• 1/4 – 5/8 lines with brazing/flaring to actual length, deep vacuum , leak testing and additional charging if required.

• 220 V power supply : circuit breaker conforming to the MOP 25 A of the 24 k, adequate cable section, external disconnect .

• Condensate management : positive slopes, pump if necessary, insulation against condensation in closed cupboards.

Commissioning & customer education

• Setting of modes , speeds , GoodSleep , Eco Mode .

• Explanations on the benefit of letting the Inverter modulate rather than switching on/off frequently.

• Maintenance instructions: PM2.5 filter (regular gentle suction), annual professional cleaning (batteries, blower, condensate tray) to preserve the actual SEER2/HSPF2 .

AirGreen Case Studies (Montreal & surrounding areas)

Rosemont–La Petite-Patrie (brick plex, ground floor 980 sq. ft.)
The client wanted to replace an undersized 18k unit that was struggling to dehumidify. We installed a 24k airHome 400 , discreet chutes, isolated condensate outlet . Result: only 0.7 to 1.0 °C variation between kitchen and living room, and humidity level maintained between 45–50% in July. Outside noise went from "annoying" to inaudible in the bedroom on the alley side (measurements ~ 53 dB(A) at 1 m, with a plant screen helping).

Laval – Sainte-Dorothée (cottage 2005, open area 1,050 sq. ft.)
Replacing an energy-intensive window system: average 28% reduction in summer consumption, airCloud GO control with weekly programming (eco-friendly time slots during the day). The couple particularly values ​​nighttime stability via GoodSleep and odor prevention thanks to Mold Guard .

Longueuil – Vieux-Longueuil (900 sq. ft. professional office)
Needs: silence + constant setpoint maintenance. The 24 k manages the airflow at low speed , 36–40 dB(A) measured, with a stable delta T and few deviations in meetings. Annual maintenance reveals a clean exchanger ; FrostWash™ has limited fouling (gain on static pressure observed).

AirGreen Guarantees, Subsidies and Transparency

• Provincial grant (LogisVert) : $875 for this 24,000 BTU model (internal update: July 17, 2025 ).

• Hitachi Warranty : Up to 10 years parts and compressor (depending on registration and extension options), with the possibility of labor extension; we confirm the exact plan upon submission, as it depends on registration and the selected program. The official documentation shows the standard/extended structure and labor extension options.

• At AirGreen : clear final quote before work begins, no deposit —you pay at the end when you're satisfied. And if a technical constraint arises (line length, supports, condensate pumps), we explain and estimate it in advance, with no surprises.

Quick FAQ – Questions our customers often ask

Is this enough to heat an entire ground floor in winter?
Yes, the machine works down to -20.5°C , and its capacity at -8°C reaches ~17,500 BTU/h . In a well-insulated house, this covers the off-season and a large part of the winter. In prolonged extreme cold, keep a backup source (baseboards).

Is Wi-Fi built-in?
Connectivity is optional ; we can add the internal adapter and configure airCloud GO for mobile control, scheduling and cost estimation .

What about maintenance?
Annual maintenance by our technicians (thorough cleaning of the exchangers/wheel, checking the load and condensates) is generally sufficient. The FrostWash™ + Mold Guard functions reduce fouling between visits.

Bottom line: Who do we recommend the 24,000 BTU airHome 400 for?

For customers looking for simplicity , silence , efficiency and air quality , in a large single space or a ground floor of a plex. With its SEER2 18.3 , its HSPF2 10.0 , its proactive maintenance functions and its advanced control options , it is a sure value for Greater Montreal .

Are you planning a project in Montreal , Laval , Longueuil , on the North Shore or the South Shore ? Contact AirGreen for a 100% free on-site estimate . We validate the load , the installation , the subsidy , and we provide you with a transparent final offer , installation by experienced refrigeration engineers .