What is the SEER2 rating of the MDV MOX330-12HFN10-M1X?

The MDV MOX330-12HFN10-M1X is rated at up to 25.5 SEER2 and 13.5 EER2 for cooling and up to 11.6 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 13 certified matchups SEER2 ranges from 20.0-25.5.

Is the MDV MOX330-12HFN10-M1X good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 12,000 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 MDV MOX330-12HFN10-M1X cost to run per year?

At its rated efficiency it costs about $222-$642 a year in electricity in large U.S. cities, depending on climate and local rates - for example $280 in Phoenix and $541 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 MDV MOX330-12HFN10-M1X?

ENERGY STAR lists 13 certified combinations for this outdoor unit. The highest-rated ones use MSEPBM-12HRFN10-M1, MSEPBM-12HRFN10-M1-D, MFA2M-12HRFN10-M1.

12,000 BTU mini-split heat pump · MSAG series

MDV MOX330-12HFN10-M1X

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

Ranks #41 of 394 12,000 BTU mini-splits for cooling efficiency, and costs about $264 a year to run in a mixed climate like Atlanta.

SEER2: 25.5 Cooling efficiency over a season
Very good · beats 88%
HSPF2: 11.6 Heating efficiency over a season
Very good · beats 86%
EER2: 13.5 Cooling efficiency on a 95°F day
Very good · beats 74%
Heat at 5°F: 12,000 BTU/h96% of its 47°F output
Average · beats 48%

A good fit if…

You want low cooling bills - its SEER2 beats 88% of mini-splits.
Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 12,000 BTU/h at 5°F.
It will heat most of the year - its HSPF2 beats 86% 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

Specifications12,000 BTU, R-454B

General
Brand	MDV
Outdoor unit model	MOX330-12HFN10-M1X
Series	MSAG 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	February 4, 2024
Last certified	May 6, 2026
Cooling
SEER2Seasonal efficiency, higher is better	25.5 (range 20.0-25.5)
EER2Efficiency at 95°F outdoors	12.0-13.5
Cooling capacity	12,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	10.0-11.6
Capacity at 47°F	12,000-12,500 BTU/h
Capacity at 17°F	9,600-12,000 BTU/h
Capacity at 5°F	11,300-12,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.80-2.00
ENERGY STAR cold climate	Yes

Heating output as it gets colder96% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with MSEPBM-12HRFN10-M1 at the standard test temperatures, in BTU/h:

Certified matchups13 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.
MSEPBM-12HRFN10-M1 · cold climate	25.5	13.5	10.5	11,500	214311112
MSEPBM-12HRFN10-M1-D · cold climate	25.4	13.4	10.5	11,500	214855563
MFA2M-12HRFN10-M1 · cold climate	25.0	12.7	10.6	11,300	214855412
MFA2M-12HRFN10-M1-D · cold climate	25.0	12.5	10.5	11,300	214855566
MSAG11BM-12HRFN10-M1 · cold climate	24.0	13.2	10.5	11,500	214311109
MCBM-12HRFN10-M1 · cold climate	23.0	13.0	10.2	11,500	214855410
MCBM-12HRFN10-M1-D · cold climate	23.0	13.0	10.0	11,500	214855564
MCA4M-12HRFN10-M1 · cold climate	22.3	12.7	11.6	11,500	214855411
MCA4M-12HRFN10-M1-D · cold climate	22.2	12.5	11.6	11,500	214855565
MTJM-12HWFN10-M1 · cold climate	20.2	12.0	10.6	12,000	214861927
MTJM-12HWFN10-M1-D · cold climate	20.0	12.0	10.6	12,000	214861941
MTIM-12HWFN10-M1 · cold climate	20.0	12.0	10.2	11,800	214855413
MTIM-12HWFN10-M1-D · cold climate	20.0	12.0	10.0	11,800	214861940

Yearly running cost in 10 large cities$222-$642

Phoenix, AZ$280/yr
Miami, FL$222/yr
Houston, TX$251/yr
Atlanta, GA$264/yr
Los Angeles, CA$259/yr
New York, NY$642/yr
Chicago, IL$523/yr
Denver, CO$437/yr
Seattle, WA$270/yr
Minneapolis, MN$541/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 MDV MOX330-12HFN10-M1X?: The MDV MOX330-12HFN10-M1X is rated at up to 25.5 SEER2 and 13.5 EER2 for cooling and up to 11.6 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 13 certified matchups SEER2 ranges from 20.0-25.5.
Is the MDV MOX330-12HFN10-M1X good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 12,000 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 MDV MOX330-12HFN10-M1X cost to run per year?: At its rated efficiency it costs about $222-$642 a year in electricity in large U.S. cities, depending on climate and local rates - for example $280 in Phoenix and $541 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 MDV MOX330-12HFN10-M1X?: ENERGY STAR lists 13 certified combinations for this outdoor unit. The highest-rated ones use MSEPBM-12HRFN10-M1, MSEPBM-12HRFN10-M1-D, MFA2M-12HRFN10-M1.
What refrigerant does the MDV MOX330-12HFN10-M1X 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 $282/yrYou save $337/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 MDV MOX330-12HFN10-M1X

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: $282
Current system, per year: $619
You save per year: $337
Payback: 13.3 years
Net after 10 years: -$1,128

Cooling $166Heating $116Electricity used: 1,759 kWhSaved vs. a minimum-efficiency heat pump: $193

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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Arcoaire D5CSHAH12AAK · cold climate25.5 SEER2 · 11.6 HSPF2
CanAir 4C25SCH12H21 · cold climate25.5 SEER2 · 11.5 HSPF2
Mitsubishi Electric MUZ-GX12NLHZ · cold climate25.6 SEER2 · 10.0 HSPF2
Cooper&Hunter CH-RES12-230VO · cold climate25.5 SEER2 · 11.5 HSPF2
Mitsubishi Electric MUZ-GS12NAH · cold climate25.6 SEER2 · 10.0 HSPF2
Goodman MSH123G32MCAA · cold climate25.5 SEER2 · 11.5 HSPF2

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

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of May 6, 2026. How we use the data.