HITACHI airHome 400 Wall-Mounted Heat Pump | 12,000 BTU - Sale & Installation

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• WiFi: Optional
• Warranty (Compressor - Parts - Labor): 10-10-0
• Additional Warranty: Possible
• Piping: 1/4 - 3/8
• Voltage: 220 V
• Sound Pressure Level (Outdoor): 51.0 dB(A)
• Sound Pressure Level (Indoor): 29 / 46 dB(A)

Simple comfort, real efficiency: the 12,000 BTU designed for Montreal and its surrounding areas

At AirGreen , we recommend the HITACHI airHome 400 – 12,000 BTU to homeowners who want reliable comfort without the hassle of complicated settings. This wall-mounted heat pump combines solid energy efficiency ( SEER2 19.5 , HSPF2 9.2 , R-32 refrigerant ) and quiet operation (up to 29 dB(A) in “Silent” mode indoors; approx. 51 dB(A) outdoors), while remaining easy to install in typical apartments, condos and plexes in Montreal , Laval , Longueuil , North Shore and South Shore.

Why the airHome 400 12,000 BTU is so well suited to your home

Key specifications that matter every day

• Capacity : 12,000 BTU cooling; 13,000 BTU heating nominal, with good resistance down to -21°C (series operation around -20.5°C according to data sheet). Ideal for a main room or a well-insulated dwelling of approximately 400–600 sq ft , depending on the envelope and occupancy.

• Efficiency : SEER2 19.5 to reduce summer consumption; HSPF2 9.2 (Region 4) for economical heating during the shoulder seasons and moderate peaks.
• Quietness : 29–46 dB(A) indoors depending on speed, for a bedroom or living room without disturbance; 51 dB(A) outdoor unit side.
• Dehumidification : up to 3.3 L/h (depending on model and conditions) to keep the air comfortable during the humid heatwaves of July and August.
• Electrical : 220–230 V , MCA 9 A , MOP 15 A for 12 k BTU; compatible with most residential panels.
• Refrigeration connections : 1/4" – 3/8" (standard piping ), total length up to 25 m and height difference up to 15 m (depending on line gauge).
• Dimensions : indoor unit 780×280×222 mm , outdoor 750×570×280 mm – a compact profile that fits well on balconies or backyards.

Useful “smart” features (without gimmicks)

• Vector DC Inverter : accelerates to reach the setpoint then slows down to maintain it while reducing consumption (up to 30% savings vs. non-inverter compressor).

• Eco Mode : Automatically adjusts the temperature to save energy without losing comfort.
• GoodSleep : temperature curve and reduced fan speed for quieter nights.
• optional Wi-Fi ( SPX-WFG03 ) and airPoint H700 wall thermostat (SPX-URFG1) ; control possible via airCloud GO , Alexa and Google Home.

Healthier air and easier maintenance

• FrostWash™ : Freezes then melts to loosen impurities from the coil, helping to maintain airflow over time.

• Mold Guard : Automatic cycle of approximately 60 minutes with coil heating to 50°C after shutdown to limit mold and odors.
• PM2.5 Filtration + Activated Carbon : captures fine particles and deodorizes ; washable stainless steel pre-filter included.
• Service-friendly design : removable side covers, removable condensate tray and fan motor , access to baffles – a plus for maintenance.

AirGreen Case Study — Apartment in Villeray (Montreal)

Context : 4 1/2 on the 2nd floor, southwest-facing windows, brick wall surfaces . The old window air conditioning was no longer sufficient and electric heating was expensive in the off-season.

AirGreen Solution : HITACHI airHome 400 – 12,000 BTU (indoor RAK-DJ12RHAA , outdoor RAC-DJ12WHAA , AHRI 216759656 ) with 1/4–3/8 piping and wall pass-through on the sill side. Measured noise level : 31–33 dB(A) in the living room at low speed; very noticeable dehumidification on a day at 29°C and 70% RH.

Result : reduction of approximately 25–30% in summer consumption vs. the window unit, improved nighttime comfort thanks to GoodSleep , and efficient additional heating until mid-November without starting the baseboards.

AirGreen Case Study — New Condo in Laval-des-Rapides

Context : 600 sq ft, high-performance insulation , co-ownership with aesthetic restrictions on the facade.

AirGreen Solution : Installation on anti-vibration wall bracket with concealed conduits , covered painted in the color of the coating. Wi-Fi added for weekly programming via airCloud GO.

Result : Owner satisfied with temperature stability and consumption alerts ; the Eco Mode option reduced the bill by 10–15% during a heat wave.

Grants, guarantees and options

• Provincial LogisVert grant : $1,008 (updated July 17, 2025 — subject to file eligibility).

• ENERGY STAR® and CCE/NEEP : Product is eligible for North American rebate programs (depending on province and configuration).

• Cold climate accessories : snow hood for the outdoor unit, anti-corrosion fins , fire-resistant electrical box – useful on river banks or open parking lots.

HVAC installation: our technical approach in the field

Sizing and positioning

We validate the thermal load room by room (orientation, glazing, infiltration, level of sealing ). On a 12 k BTU, we aim for a line length ≤ 15 m when possible, to optimize the efficiency and the quantity of R-32 . The cable gutters and tube covers are laid with a line for a clean finish, particularly on brick facades.

Power supply & protection

220–230 V connection with dedicated 15 A circuit breaker and external disconnect box , according to local building code and RBQ / ESA requirements. The 9 A MCA current of the 12 k leaves room in recent panels.

Condensate management & frost risks

Since the indoor unit's tray and drain are removable , we provide an odor trap and a continuous slope , with a heating cable if the discharge is to the outside. The Mold Guard option helps keep the core of the unit dry after shutdown, limiting biofilm and mold.

Tips for maximizing savings

• Auto + Inverter Mode : Let the machine regulate rather than switching on/off frequently; this is when the inverter is most effective.

• GoodSleep at night : you will gain in silence and temperature stability .

• Filtration : Rinse the stainless steel pre-filter every 4–6 weeks; schedule an annual deep cleaning to maintain performance.

• Eco Mode during periods of absence: a few degrees of shift are enough to save money without losing comfort upon return.

Mistakes to avoid (seen in the field)

• Undersize a 12k BTU for an open area > 700 sq ft : the unit will run quickly at high speed , increasing noise and consumption.

• Ignore the clearance around the outdoor unit (small balconies): air recirculation penalizes the COP and longevity.

• Neglecting the drain slope or tight elbows : risk of odor returns , frost and leaks in the wall. The service access provided by HITACHI simplifies corrections, but it is better to do it right from the installation.

Product sheet — practical elements

• Model Numbers : Indoor RAK-DJ12RHAA | Outdoor RAC-DJ12WHAA | AHRI 216759656

• ENERGY STAR® : Yes ; Cold Climate : Yes

• Refrigerant : R-32 | Wi-Fi : Optional | Voltage : 220 V

• Sound levels : 29 / 46 dB(A) (indoor min/max); 51 dB(A) (outdoor)

• Standard warranty : 10 years compressor / 10 years parts / 0 labor (options available)

• Connections : 1/4 – 3/8 | Max length : 25 m | Max height difference : 15 m

• Accessories : snow-hood , anti-corrosion blue fins , fireproof electrical box , SPX-WFG03 , SPX-URFG1.

Why choose AirGreen for the airHome 400

• Local HVAC expertise : our teams intervene every week in Montreal , Laval , Longueuil , North Shore , South Shore , with in-depth knowledge of brick buildings , plexes and condos .

• Transparency : final quote before work , no deposit , payment at the end when you are 100% satisfied .

• After-sales service : HITACHI parts and FrostWash-friendly maintenance; user training (Wi-Fi, GoodSleep , Eco Mode ).

• Grant support : setting up the LogisVert file to maximize your discounts .

Conclusion & Call to Action

The HITACHI airHome 400 – 12,000 BTU offers the balance that homeowners are looking for: energy efficiency , quietness , cleaner air , and reliability designed for our winters. For a careful and durable HVAC installation , AirGreen supports you from the free on-site estimate to service years later.

Need a price and expert advice?
Contact us at 514-316-2973 or sales@airgreen.ca We serve Montreal , Laval , Longueuil , the North Shore and the South Shore . Schedule your free visit today!