What is the SEER2 rating of the Hitachi RAC-DJ24WHAA?

The Hitachi RAC-DJ24WHAA is rated at up to 18.3 SEER2 and 12.0 EER2 for cooling and up to 10.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.

Is the Hitachi RAC-DJ24WHAA good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 18,400 BTU/h at 5°F with a COP of 2.10, so it is still 2.1 times as efficient as electric resistance heat at that temperature.

How much does the Hitachi RAC-DJ24WHAA cost to run per year?

At its rated efficiency it costs about $566-$1,566 a year in electricity in large U.S. cities, depending on climate and local rates - for example $705 in Phoenix and $1,314 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Which indoor units work with the Hitachi RAC-DJ24WHAA?

ENERGY STAR lists 2 certified combinations for this outdoor unit. The highest-rated ones use RAK-DJ24PHAA, RAK-DJ24RHAA.

24,000 BTU mini-split heat pump · airHome 400

Hitachi RAC-DJ24WHAA

Below average cooling efficiency and average heating efficiency for a 24,000 BTU mini-split heat pump, and certified for cold climates.

Ranks #405 of 430 24,000 BTU mini-splits for cooling efficiency, and costs about $650 a year to run in a mixed climate like Atlanta.

SEER2: 18.3 Cooling efficiency over a season
Below average · beats 5%
HSPF2: 10.0 Heating efficiency over a season
Average · beats 43%
EER2: 12.0 Cooling efficiency on a 95°F day
Below average · beats 25%
Heat at 5°F: 18,400 BTU/h74% of its 47°F output
Average · beats 67%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 18,400 BTU/h at 5°F.
You want steady temperatures and quiet running - the compressor varies its speed.

Think twice if…

Cooling cost matters most - its SEER2 is below average for mini-splits.

Calculate my running cost

Details

Specifications24,000 BTU, R-32

General
Brand	Hitachi
Outdoor unit model	RAC-DJ24WHAA
Series	airHome 400
Type	Mini-split heat pump
Nominal size	24,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-32
Connected (smart) capable	No
On the market since	April 28, 2026
Last certified	May 6, 2026
Cooling
SEER2Seasonal efficiency, higher is better	18.3 (range 18.3)
EER2Efficiency at 95°F outdoors	12.0
Cooling capacity	22,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	10.0
Capacity at 47°F	25,000 BTU/h
Capacity at 17°F	17,500 BTU/h
Capacity at 5°F	18,400 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.10
ENERGY STAR cold climate	Yes

Heating output as it gets colder74% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with RAK-DJ24PHAA at the standard test temperatures, in BTU/h:

Certified matchups2 indoor units

The same outdoor unit scores differently with each indoor unit. Ask your installer for the AHRI reference number of the exact system you are quoted.

Indoor unit	SEER2	EER2	HSPF2	Heat @5°F	AHRI ref.
RAK-DJ24PHAA · cold climate	18.3	12.0	10.0	18,400	215224722
RAK-DJ24RHAA · cold climate	18.3	12.0	10.0	18,400	216759658

Yearly running cost in 10 large cities$566-$1,566

Phoenix, AZ$705/yr
Miami, FL$566/yr
Houston, TX$632/yr
Atlanta, GA$650/yr
Los Angeles, CA$635/yr
New York, NY$1,566/yr
Chicago, IL$1,274/yr
Denver, CO$1,061/yr
Seattle, WA$654/yr
Minneapolis, MN$1,314/yr

At each state's average electricity price and the city's typical heating and cooling hours.

Questions5

What is the SEER2 rating of the Hitachi RAC-DJ24WHAA?: The Hitachi RAC-DJ24WHAA is rated at up to 18.3 SEER2 and 12.0 EER2 for cooling and up to 10.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
Is the Hitachi RAC-DJ24WHAA good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 18,400 BTU/h at 5°F with a COP of 2.10, so it is still 2.1 times as efficient as electric resistance heat at that temperature.
How much does the Hitachi RAC-DJ24WHAA cost to run per year?: At its rated efficiency it costs about $566-$1,566 a year in electricity in large U.S. cities, depending on climate and local rates - for example $705 in Phoenix and $1,314 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Which indoor units work with the Hitachi RAC-DJ24WHAA?: ENERGY STAR lists 2 certified combinations for this outdoor unit. The highest-rated ones use RAK-DJ24PHAA, RAK-DJ24RHAA.
What refrigerant does the Hitachi RAC-DJ24WHAA use?: It uses R-32.

Running cost and savings

Pre-filled with this model. Pick your city and what you heat with today; everything else is optional.

Heat pump $703/yrYou save $480/yrSee details ↓

1. Where you live

StateCityElectricity ¢ per kWh

Adjust heating and cooling hours

Filled in from your city's climate. Change them if you run the system much more or less than usual.

Cooling hours full-load hours per yearHeating hours full-load hours per year

2. The heat pump Hitachi RAC-DJ24WHAA

Find a model (fills in the ratings below)

SEER2 cooling efficiencyHSPF2 heating efficiencyCooling capacity BTU/hHeating capacity BTU/h

3. What it replaces

Current heatingFurnace efficiency (AFUE %)Gas price, $/thermCurrent coolingOld AC rating SEER2 (10 ≈ 15+ years old)

4. Price replace the example with your quote

Installed price, $Rebates and incentives, $ utility, state

Heat pump, per year: $703
Current system, per year: $1,183
You save per year: $480
Payback: 17.7 years
Net after 10 years: -$3,697

Cooling $423Heating $280Electricity used: 4,395 kWhSaved vs. a minimum-efficiency heat pump: $212

Estimates use the unit's rated SEER2 and HSPF2, full-load hours derived from NOAA 1991-2020 degree days, average residential electricity prices from the U.S. EIA (12 months to July 2026) and fuel prices from EIA (2025 for natural gas, week of 2026-10-05 for propane and heating oil). Very cold days that need backup heat are not modelled. Federal minimum for comparison: 14.3 SEER2 / 7.5 HSPF2.

Similar 24,000 BTU models

Midea 37MTRAQ27DA3 · cold climate18.5 SEER2 · 8.5 HSPF2
York YRACDJ24WHAA · cold climate18.3 SEER2 · 10.0 HSPF2
Arcoaire D5CMTAH27DAK · cold climate18.5 SEER2 · 8.5 HSPF2
Daikin RXP24AVJU · cold climate18.3 SEER2 · 9.2 HSPF2
Fujitsu AOU24RLXFZ18.5 SEER2 · 8.7 HSPF2
Mitsubishi Electric RUZ-AH24NL · cold climate18.1 SEER2 · 8.5 HSPF2
Midea MO1BS-H24B-2A · cold climate18.5 SEER2 · 9.0 HSPF2
GE Appliances 1G24CB2BE · cold climate18.0 SEER2 · 9.5 HSPF2

See all 430 24,000 BTU mini-splits, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of May 6, 2026. How we use the data.