What is the SEER2 rating of the Goodman MSH123G22MCAA?

The Goodman MSH123G22MCAA is rated at up to 23.1 SEER2 and 13.0 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 3 certified matchups SEER2 ranges from 19.5-23.1.

Is the Goodman MSH123G22MCAA good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 12,100 BTU/h at 5°F with a COP of 1.96, so it is still 2.0 times as efficient as electric resistance heat at that temperature.

How much does the Goodman MSH123G22MCAA cost to run per year?

At its rated efficiency it costs about $245-$709 a year in electricity in large U.S. cities, depending on climate and local rates - for example $309 in Phoenix and $598 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the Goodman MSH123G22MCAA the same as the SLIMAIR SHC12VH2AG?

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 Goodman MSH123G22MCAA?

ENERGY STAR lists 3 certified combinations for this outdoor unit. The highest-rated ones use GOODMAN MSH123G22AXAA, GOODMAN MST123E20ACAA, GOODMAN MST123E21ADAA.

What refrigerant does the Goodman MSH123G22MCAA 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.

12,000 BTU mini-split heat pump · MSH Series

Goodman MSH123G22MCAA

Average cooling and heating efficiency for a 12,000 BTU mini-split heat pump, and certified for cold climates.

Ranks #236 of 394 12,000 BTU mini-splits for cooling efficiency, and costs about $291 a year to run in a mixed climate like Atlanta.

SEER2: 23.1 Cooling efficiency over a season
Average · beats 66%
HSPF2: 10.5 Heating efficiency over a season
Average · beats 61%
EER2: 13.0 Cooling efficiency on a 95°F day
Average · beats 62%
Heat at 5°F: 12,100 BTU/h92% of its 47°F output
Below average · beats 36%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 12,100 BTU/h at 5°F.
You want steady temperatures and quiet running - the compressor varies its speed.

Think twice if…

You want the newest refrigerant - it uses R-410A, which is being phased down.

Calculate my running cost

Details

Specifications12,000 BTU, R-410A

General
Brand	Goodman
Also sold as	SLIMAIR
Outdoor unit model	MSH123G22MCAA
Series	MSH Series
Type	Mini-split heat pump
Nominal size	12,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	March 18, 2024
Last certified	June 13, 2026
Cooling
SEER2Seasonal efficiency, higher is better	23.1 (range 19.5-23.1)
EER2Efficiency at 95°F outdoors	11.7-13.0
Cooling capacity	12,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	10.0-10.5
Capacity at 47°F	12,000-12,500 BTU/h
Capacity at 17°F	9,900-10,600 BTU/h
Capacity at 5°F	11,000-12,100 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.88-1.96
ENERGY STAR cold climate	Yes

Heating output as it gets colder92% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with MSH123G22AXAA 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.
MSH123G22AXAA GOODMAN · cold climate	23.1	13.0	10.5	11,000	214438117
MST123E20ACAA GOODMAN · cold climate	22.3	12.7	10.2	11,300	214594900
MST123E21ADAA GOODMAN · cold climate	19.5	11.7	10.0	12,100	214594902

Same unit, other model numbers1

These model numbers have exactly the same certified ratings and matchups as the Goodman MSH123G22MCAA: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

SLIMAIR SHC12VH2AG

Yearly running cost in 10 large cities$245-$709

Phoenix, AZ$309/yr
Miami, FL$245/yr
Houston, TX$278/yr
Atlanta, GA$291/yr
Los Angeles, CA$286/yr
New York, NY$709/yr
Chicago, IL$578/yr
Denver, CO$482/yr
Seattle, WA$298/yr
Minneapolis, MN$598/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 Goodman MSH123G22MCAA?: The Goodman MSH123G22MCAA is rated at up to 23.1 SEER2 and 13.0 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 3 certified matchups SEER2 ranges from 19.5-23.1.
Is the Goodman MSH123G22MCAA good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 12,100 BTU/h at 5°F with a COP of 1.96, so it is still 2.0 times as efficient as electric resistance heat at that temperature.
How much does the Goodman MSH123G22MCAA cost to run per year?: At its rated efficiency it costs about $245-$709 a year in electricity in large U.S. cities, depending on climate and local rates - for example $309 in Phoenix and $598 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the Goodman MSH123G22MCAA the same as the SLIMAIR SHC12VH2AG?: 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 Goodman MSH123G22MCAA?: ENERGY STAR lists 3 certified combinations for this outdoor unit. The highest-rated ones use GOODMAN MSH123G22AXAA, GOODMAN MST123E20ACAA, GOODMAN MST123E21ADAA.
What refrigerant does the Goodman MSH123G22MCAA 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 $311/yrYou save $308/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 MSH123G22MCAA

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: $311
Current system, per year: $619
You save per year: $308
Payback: 14.6 years
Net after 10 years: -$1,421

Cooling $183Heating $128Electricity used: 1,943 kWhSaved vs. a minimum-efficiency heat pump: $164

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 12,000 BTU models

ZERO ZMSB-12HV-USHH · cold climate23.1 SEER2 · 10.8 HSPF2
ZERO ZMSB-12HV-USHHC · cold climate23.1 SEER2 · 10.5 HSPF2
SLIMAIR SHC12VE2AG · cold climate23.1 SEER2 · 10.8 HSPF2
ECO AC EHH-O12BB · cold climate23.1 SEER2 · 10.3 HSPF2
LBG Products LBHB12DUWO · cold climate23.1 SEER2 · 10.8 HSPF2
DUCTLESSAIRE 454-12-O-DA · cold climate23.1 SEER2 · 10.2 HSPF2
ZERO ZMSB-12HV-USHHR2-O · cold climate23.1 SEER2 · 11.5 HSPF2
KANIONco KWSM-12IR410AHS22MV23.1 SEER2 · 9.3 HSPF2

See all 394 12,000 BTU mini-splits, ranked

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