What is the SEER2 rating of the Midea MO1ES-H12B-1A?

The Midea MO1ES-H12B-1A is rated at up to 23.4 SEER2 and 13.0 EER2 for cooling and up to 9.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.

Is the Midea MO1ES-H12B-1A good for cold climates?

It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 12,000 BTU model.

How much does the Midea MO1ES-H12B-1A cost to run per year?

At its rated efficiency it costs about $243-$768 a year in electricity in large U.S. cities, depending on climate and local rates - for example $316 in Phoenix and $655 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 Midea MO1ES-H12B-1A?

ENERGY STAR lists 2 certified combinations for this outdoor unit. The highest-rated ones use MIDEA MSEEU-H12B-1A, MIDEA MSEES-H12B-1A.

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

Midea MO1ES-H12B-1A

Average cooling efficiency and below average heating efficiency for a 12,000 BTU mini-split heat pump, but not rated for cold climates.

Ranks #224 of 394 12,000 BTU mini-splits for cooling efficiency, and costs about $310 a year to run in a mixed climate like Atlanta.

SEER2: 23.4 Cooling efficiency over a season
Average · beats 68%
HSPF2: 9.5 Heating efficiency over a season
Below average · beats 24%
EER2: 13.0 Cooling efficiency on a 95°F day
Average · beats 62%
Heat at 5°F: 7,700 BTU/h64% of its 47°F output
Very good · beats 88%

A good fit if…

You want steady temperatures and quiet running - the compressor varies its speed.

Think twice if…

You often see nights below 0°F - it is not cold-climate certified.
You mainly need heat - its HSPF2 is below average for mini-splits.

Calculate my running cost

Details

Specifications12,000 BTU, R-454B

General
Brand	Midea
Outdoor unit model	MO1ES-H12B-1A
Series	MSE Series
Type	Mini-split heat pump
Nominal size	12,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	September 5, 2024
Last certified	March 4, 2025
Cooling
SEER2Seasonal efficiency, higher is better	23.4 (range 23.4)
EER2Efficiency at 95°F outdoors	13.0
Cooling capacity	12,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	9.5
Capacity at 47°F	12,000 BTU/h
Capacity at 17°F	8,700 BTU/h
Capacity at 5°F	7,700 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.33
ENERGY STAR cold climate	No

Heating output as it gets colder64% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with MSEEU-H12B-1A 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.
MSEEU-H12B-1A MIDEA	23.4	13.0	9.5	7,700	215471374
MSEES-H12B-1A MIDEA	23.4	13.0	9.5	7,700	215540512

Yearly running cost in 10 large cities$243-$768

Phoenix, AZ$316/yr
Miami, FL$243/yr
Houston, TX$284/yr
Atlanta, GA$310/yr
Los Angeles, CA$307/yr
New York, NY$768/yr
Chicago, IL$629/yr
Denver, CO$528/yr
Seattle, WA$328/yr
Minneapolis, MN$655/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 Midea MO1ES-H12B-1A?: The Midea MO1ES-H12B-1A is rated at up to 23.4 SEER2 and 13.0 EER2 for cooling and up to 9.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
Is the Midea MO1ES-H12B-1A good for cold climates?: It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 12,000 BTU model.
How much does the Midea MO1ES-H12B-1A cost to run per year?: At its rated efficiency it costs about $243-$768 a year in electricity in large U.S. cities, depending on climate and local rates - for example $316 in Phoenix and $655 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 Midea MO1ES-H12B-1A?: ENERGY STAR lists 2 certified combinations for this outdoor unit. The highest-rated ones use MIDEA MSEEU-H12B-1A, MIDEA MSEES-H12B-1A.
What refrigerant does the Midea MO1ES-H12B-1A 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 $322/yrYou save $297/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 Midea MO1ES-H12B-1A

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: $322
Current system, per year: $619
You save per year: $297
Payback: 15.2 years
Net after 10 years: -$1,532

Cooling $181Heating $141Electricity used: 2,012 kWhSaved vs. a minimum-efficiency heat pump: $153

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

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CanAir 4C25SCH12H1123.4 SEER2 · 10.4 HSPF2
Mainline ML12HP115NEX-O23.2 SEER2 · 10.4 HSPF2
Innovair WIN12H7H51(O) · cold climate23.5 SEER2 · 9.5 HSPF2
ZERO ZMSB-12HV110-USHHR2-O23.2 SEER2 · 10.4 HSPF2
Carrier 37MARAQ12AA123.5 SEER2 · 9.5 HSPF2
ApooDr ASG24-12H220V1B · cold climate23.1 SEER2 · 11.5 HSPF2

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

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of March 4, 2025. How we use the data.