What is the SEER2 rating of the Panasonic CU-YM24CBUC?

The Panasonic CU-YM24CBUC is rated at up to 23.5 SEER2 and 13.0 EER2 for cooling and up to 11.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 3 certified matchups SEER2 ranges from 19.0-23.5.

Is the Panasonic CU-YM24CBUC good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 19,000 BTU/h at 5°F with a COP of 2.30, so it is still 2.3 times as efficient as electric resistance heat at that temperature.

How much does the Panasonic CU-YM24CBUC cost to run per year?

At its rated efficiency it costs about $482-$1,406 a year in electricity in large U.S. cities, depending on climate and local rates - for example $610 in Phoenix and $1,188 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the Panasonic CU-YM24CBUC the same as the Napoleon NDHAS22BA-24-O?

Yes, as far as the certified ratings go. ENERGY STAR lists both model numbers with identical efficiency, capacity and matchups, which means the same outdoor unit sold under a different brand or with a minor variant code (voltage, colour or region). The full list is on this page.

Which indoor units work with the Panasonic CU-YM24CBUC?

ENERGY STAR lists 3 certified combinations for this outdoor unit. The highest-rated ones use CS-YM24CKUW, CS-YM24CL4UW, CS-YM24CD1UW.

24,000 BTU mini-split heat pump · CU Series

Panasonic CU-YM24CBUC

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

Ranks #74 of 430 24,000 BTU mini-splits for cooling efficiency, and costs about $577 a year to run in a mixed climate like Atlanta.

SEER2: 23.5 Cooling efficiency over a season
Very good · beats 70%
HSPF2: 11.0 Heating efficiency over a season
Very good · beats 75%
EER2: 13.0 Cooling efficiency on a 95°F day
Average · beats 62%
Heat at 5°F: 19,000 BTU/h71% of its 47°F output
Very good · beats 86%

A good fit if…

You want low cooling bills - its SEER2 beats 70% of mini-splits.
Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 19,000 BTU/h at 5°F.
It will heat most of the year - its HSPF2 beats 75% of mini-splits.
You want steady temperatures and quiet running - the compressor varies its speed.

Think twice if…

Nothing stands out - its ratings have no weak spot for its class.

Calculate my running cost

Details

Specifications24,000 BTU, R-454B

General
Brand	Panasonic
Also sold as	Napoleon
Outdoor unit model	CU-YM24CBUC
Series	CU Series
Type	Mini-split heat pump
Nominal size	24,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	December 10, 2025
Last certified	May 28, 2026
Cooling
SEER2Seasonal efficiency, higher is better	23.5 (range 19.0-23.5)
EER2Efficiency at 95°F outdoors	12.0-13.0
Cooling capacity	24,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	10.0-11.0
Capacity at 47°F	25,000 BTU/h
Capacity at 17°F	20,400-22,400 BTU/h
Capacity at 5°F	17,800-19,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.15-2.30
ENERGY STAR cold climate	Yes

Heating output as it gets colder71% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with CS-YM24CKUW at the standard test temperatures, in BTU/h:

Certified matchups3 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.
CS-YM24CKUW · cold climate	23.5	13.0	10.0	17,800	218027963
CS-YM24CL4UW · cold climate	22.0	12.0	10.5	18,500	218027967
CS-YM24CD1UW · cold climate	19.0	12.5	11.0	19,000	218027971

Same unit, other model numbers1

These model numbers have exactly the same certified ratings and matchups as the Panasonic CU-YM24CBUC: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

Napoleon NDHAS22BA-24-O

Yearly running cost in 10 large cities$482-$1,406

Phoenix, AZ$610/yr
Miami, FL$482/yr
Houston, TX$548/yr
Atlanta, GA$577/yr
Los Angeles, CA$566/yr
New York, NY$1,406/yr
Chicago, IL$1,147/yr
Denver, CO$958/yr
Seattle, WA$592/yr
Minneapolis, MN$1,188/yr

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

Questions6

What is the SEER2 rating of the Panasonic CU-YM24CBUC?: The Panasonic CU-YM24CBUC is rated at up to 23.5 SEER2 and 13.0 EER2 for cooling and up to 11.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 3 certified matchups SEER2 ranges from 19.0-23.5.
Is the Panasonic CU-YM24CBUC good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 19,000 BTU/h at 5°F with a COP of 2.30, so it is still 2.3 times as efficient as electric resistance heat at that temperature.
How much does the Panasonic CU-YM24CBUC cost to run per year?: At its rated efficiency it costs about $482-$1,406 a year in electricity in large U.S. cities, depending on climate and local rates - for example $610 in Phoenix and $1,188 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the Panasonic CU-YM24CBUC the same as the Napoleon NDHAS22BA-24-O?: Yes, as far as the certified ratings go. ENERGY STAR lists both model numbers with identical efficiency, capacity and matchups, which means the same outdoor unit sold under a different brand or with a minor variant code (voltage, colour or region). The full list is on this page.
Which indoor units work with the Panasonic CU-YM24CBUC?: ENERGY STAR lists 3 certified combinations for this outdoor unit. The highest-rated ones use CS-YM24CKUW, CS-YM24CL4UW, CS-YM24CD1UW.
What refrigerant does the Panasonic CU-YM24CBUC use?: It uses R-454B.

Running cost and savings

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

Heat pump $614/yrYou save $640/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 Panasonic CU-YM24CBUC

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: $614
Current system, per year: $1,254
You save per year: $640
Payback: 14.1 years
Net after 10 years: -$2,602

Cooling $359Heating $255Electricity used: 3,838 kWhSaved vs. a minimum-efficiency heat pump: $350

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

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ZERO ZMSB-24HV-USHHR2-O · cold climate23.5 SEER2 · 10.5 HSPF2
SLIMAIR SHC24AE2AG · cold climate23.5 SEER2 · 11.1 HSPF2
ApooDr ASG24-24H1B · cold climate23.5 SEER2 · 10.0 HSPF2
Mainline ML24HP230NEX-O · cold climate23.5 SEER2 · 11.1 HSPF2
Continental CDHAS22B-24-O · cold climate23.5 SEER2 · 10.0 HSPF2
AI AIR CONDITIONING AO24-24N2-M1 · cold climate23.5 SEER2 · 11.1 HSPF2
KANIONco KWSM-24IR454BHS22.5R · cold climate23.5 SEER2 · 10.0 HSPF2

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

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of May 28, 2026. How we use the data.