What is the SEER2 rating of the Midea MOX4-18HFN10AE?

The Midea MOX4-18HFN10AE is rated at up to 23.5 SEER2 and 12.7 EER2 for cooling and up to 10.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.

Is the Midea MOX4-18HFN10AE good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 12,800 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 Midea MOX4-18HFN10AE cost to run per year?

At its rated efficiency it costs about $361-$1,035 a year in electricity in large U.S. cities, depending on climate and local rates - for example $455 in Phoenix and $873 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the Midea MOX4-18HFN10AE the same as the MOOVAIR MSHEA18C2AN?

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 Midea MOX4-18HFN10AE?

ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses MIDEA MSEP-18HFN10AE.

18,000 BTU mini-split heat pump · MSEP Series

Midea MOX4-18HFN10AE

Very good cooling and heating efficiency for a 18,000 BTU mini-split heat pump, and certified for cold climates.

Ranks #119 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $426 a year to run in a mixed climate like Atlanta.

SEER2: 23.5 Cooling efficiency over a season
Very good · beats 70%
HSPF2: 10.8 Heating efficiency over a season
Very good · beats 71%
EER2: 12.7 Cooling efficiency on a 95°F day
Average · beats 54%
Heat at 5°F: 12,800 BTU/h71% of its 47°F output
Average · beats 67%

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 12,800 BTU/h at 5°F.
It will heat most of the year - its HSPF2 beats 71% 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

Specifications18,000 BTU, R-454B

General
Brand	Midea
Also sold as	MOOVAIR
Outdoor unit model	MOX4-18HFN10AE
Series	MSEP Series
Type	Mini-split heat pump
Nominal size	18,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	November 10, 2024
Last certified	May 13, 2026
Cooling
SEER2Seasonal efficiency, higher is better	23.5 (range 23.5)
EER2Efficiency at 95°F outdoors	12.7
Cooling capacity	18,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	10.8
Capacity at 47°F	18,000 BTU/h
Capacity at 17°F	15,000 BTU/h
Capacity at 5°F	12,800 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 colder71% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with MSEP-18HFN10AE at the standard test temperatures, in BTU/h:

Certified matchups1 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.
MSEP-18HFN10AE MIDEA · cold climate	23.5	12.7	10.8	12,800	216093979

Same unit, other model numbers1

These model numbers have exactly the same certified ratings and matchups as the Midea MOX4-18HFN10AE: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

MOOVAIR MSHEA18C2AN

Yearly running cost in 10 large cities$361-$1,035

Phoenix, AZ$455/yr
Miami, FL$361/yr
Houston, TX$408/yr
Atlanta, GA$426/yr
Los Angeles, CA$418/yr
New York, NY$1,035/yr
Chicago, IL$844/yr
Denver, CO$704/yr
Seattle, WA$435/yr
Minneapolis, MN$873/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 Midea MOX4-18HFN10AE?: The Midea MOX4-18HFN10AE is rated at up to 23.5 SEER2 and 12.7 EER2 for cooling and up to 10.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
Is the Midea MOX4-18HFN10AE good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 12,800 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 Midea MOX4-18HFN10AE cost to run per year?: At its rated efficiency it costs about $361-$1,035 a year in electricity in large U.S. cities, depending on climate and local rates - for example $455 in Phoenix and $873 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the Midea MOX4-18HFN10AE the same as the MOOVAIR MSHEA18C2AN?: 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 Midea MOX4-18HFN10AE?: ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses MIDEA MSEP-18HFN10AE.
What refrigerant does the Midea MOX4-18HFN10AE 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 $456/yrYou save $472/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 MOX4-18HFN10AE

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: $456
Current system, per year: $928
You save per year: $472
Payback: 14.8 years
Net after 10 years: -$2,282

Cooling $270Heating $187Electricity used: 2,852 kWhSaved vs. a minimum-efficiency heat pump: $256

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 18,000 BTU models

Kaden KO-PSX18HP-2AAMA23.5 SEER2 · 10.8 HSPF2
Elios DEA18HOS25230E823.5 SEER2 · 10.8 HSPF2
MOOVAIR DMA18HOS25230E823.5 SEER2 · 10.8 HSPF2
DIRECT AIR DIRM-18DA25-1Z23.5 SEER2 · 10.8 HSPF2
Concord 4DHP2S18S-1P23.5 SEER2 · 10.7 HSPF2
Bosch BMS500-AAS018-1CSXRC23.5 SEER2 · 10.8 HSPF2
Lennox MPC018S4S-1P23.5 SEER2 · 10.7 HSPF2
AC Pro AOX430-18HFN1-MT8W23.5 SEER2 · 10.8 HSPF2

See all 465 18,000 BTU mini-splits, ranked

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