What is the SEER2 rating of the Goodman MSH243E23MCAA?

The Goodman MSH243E23MCAA is rated at up to 19.2 SEER2 and 12.0 EER2 for cooling and up to 10.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 4 certified matchups SEER2 ranges from 18.9-19.2.

Is the Goodman MSH243E23MCAA good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 27,000 BTU/h at 5°F with a COP of 2.00, so it is still 2.0 times as efficient as electric resistance heat at that temperature.

How much does the Goodman MSH243E23MCAA cost to run per year?

At its rated efficiency it costs about $587-$1,517 a year in electricity in large U.S. cities, depending on climate and local rates - for example $716 in Phoenix and $1,262 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 Goodman MSH243E23MCAA?

ENERGY STAR lists 4 certified combinations for this outdoor unit. The highest-rated ones use GOODMAN MST243E21ADAA, FRANKLIN MST243E21ADAA, GOODMAN MSH243E23AXAA.

What refrigerant does the Goodman MSH243E23MCAA use?

It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and R-32.

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

Goodman MSH243E23MCAA

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

Ranks #371 of 430 24,000 BTU mini-splits for cooling efficiency, and costs about $640 a year to run in a mixed climate like Atlanta.

SEER2: 19.2 Cooling efficiency over a season
Below average · beats 11%
HSPF2: 10.5 Heating efficiency over a season
Average · beats 61%
EER2: 12.0 Cooling efficiency on a 95°F day
Below average · beats 25%
Heat at 5°F: 27,000 BTU/h108% of its 47°F output
Average · beats 48%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 27,000 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.
You want the newest refrigerant - it uses R-410A, which is being phased down.

Calculate my running cost

Details

Specifications24,000 BTU, R-410A

General
Brand	Goodman
Also sold as	Franklin
Outdoor unit model	MSH243E23MCAA
Series	MSH Series
Type	Mini-split heat pump
Nominal size	24,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	December 8, 2024
Last certified	June 13, 2026
Cooling
SEER2Seasonal efficiency, higher is better	19.2 (range 18.9-19.2)
EER2Efficiency at 95°F outdoors	11.7-12.0
Cooling capacity	21,600-24,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	10.4-10.5
Capacity at 47°F	23,400-25,000 BTU/h
Capacity at 17°F	19,400-21,000 BTU/h
Capacity at 5°F	23,400-27,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.89-2.00
ENERGY STAR cold climate	Yes

Heating output as it gets colder108% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with MST243E21ADAA at the standard test temperatures, in BTU/h:

Certified matchups4 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.
MST243E21ADAA GOODMAN · cold climate	19.2	12.0	10.5	27,000	206900422
MST243E21ADAA FRANKLIN · cold climate	19.2	12.0	10.5	27,000	206900430
MSH243E23AXAA GOODMAN · cold climate	18.9	11.7	10.4	23,400	203991093
MSH243E23AXAA FRANKLIN · cold climate	18.9	11.7	10.4	23,400	206764065

Yearly running cost in 10 large cities$587-$1,517

Phoenix, AZ$716/yr
Miami, FL$587/yr
Houston, TX$641/yr
Atlanta, GA$640/yr
Los Angeles, CA$620/yr
New York, NY$1,517/yr
Chicago, IL$1,229/yr
Denver, CO$1,020/yr
Seattle, WA$625/yr
Minneapolis, MN$1,262/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 Goodman MSH243E23MCAA?: The Goodman MSH243E23MCAA is rated at up to 19.2 SEER2 and 12.0 EER2 for cooling and up to 10.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 4 certified matchups SEER2 ranges from 18.9-19.2.
Is the Goodman MSH243E23MCAA good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 27,000 BTU/h at 5°F with a COP of 2.00, so it is still 2.0 times as efficient as electric resistance heat at that temperature.
How much does the Goodman MSH243E23MCAA cost to run per year?: At its rated efficiency it costs about $587-$1,517 a year in electricity in large U.S. cities, depending on climate and local rates - for example $716 in Phoenix and $1,262 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 Goodman MSH243E23MCAA?: ENERGY STAR lists 4 certified combinations for this outdoor unit. The highest-rated ones use GOODMAN MST243E21ADAA, FRANKLIN MST243E21ADAA, GOODMAN MSH243E23AXAA.
What refrigerant does the Goodman MSH243E23MCAA use?: It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and 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 $707/yrYou save $547/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 Goodman MSH243E23MCAA

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: $707
Current system, per year: $1,254
You save per year: $547
Payback: 16.4 years
Net after 10 years: -$3,528

Cooling $440Heating $267Electricity used: 4,417 kWhSaved vs. a minimum-efficiency heat pump: $257

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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Napoleon NH25-18H-O · cold climate19.4 SEER2 · 10.4 HSPF2
PerfectAire 1KARDA24SZO20.5 · cold climate19.2 SEER2 · 10.5 HSPF2
Trane / Mitsubishi Electric SUZ-KA30NAH19.4 SEER2 · 11.5 HSPF2
PerfectAire 1PAMSHH24-SZW-20.5 · cold climate19.2 SEER2 · 10.5 HSPF2
Trane / Mitsubishi Electric SUZ-KA30NA19.4 SEER2 · 11.7 HSPF2
ECO AC EHH-O24BA · cold climate19.0 SEER2 · 11.2 HSPF2

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

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of June 13, 2026. How we use the data.