What is the SEER2 rating of the MDV MOX430-18HFN10-M1X?

The MDV MOX430-18HFN10-M1X is rated at up to 21.7 SEER2 and 13.0 EER2 for cooling and up to 12.4 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 17 certified matchups SEER2 ranges from 18.0-21.7.

Is the MDV MOX430-18HFN10-M1X good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 18,000 BTU/h at 5°F with a COP of 2.20, so it is still 2.2 times as efficient as electric resistance heat at that temperature.

How much does the MDV MOX430-18HFN10-M1X cost to run per year?

At its rated efficiency it costs about $368-$971 a year in electricity in large U.S. cities, depending on climate and local rates - for example $452 in Phoenix and $810 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 MOX430-18HFN10-M1X?

ENERGY STAR lists 17 certified combinations for this outdoor unit. The highest-rated ones use MSAG11D-18HRFN10-M1, MSEPC-18HRFN10-M1, MSEPC-18HRFN10-M1-D.

18,000 BTU mini-split heat pump · MSAG series

MDV MOX430-18HFN10-M1X

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

Ranks #242 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $407 a year to run in a mixed climate like Atlanta.

SEER2: 21.7 Cooling efficiency over a season
Average · beats 42%
HSPF2: 12.4 Heating efficiency over a season
Excellent · beats 93%
EER2: 13.0 Cooling efficiency on a 95°F day
Average · beats 62%
Heat at 5°F: 18,000 BTU/h100% of its 47°F output
Very good · beats 78%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 18,000 BTU/h at 5°F.
It will heat most of the year - its HSPF2 beats 93% of mini-splits.
You want steady temperatures and quiet running - the compressor varies its speed.
You want a choice of indoor units - 17 certified pairings.

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	MDV
Outdoor unit model	MOX430-18HFN10-M1X
Series	MSAG 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	October 12, 2022
Last certified	May 6, 2026
Cooling
SEER2Seasonal efficiency, higher is better	21.7 (range 18.0-21.7)
EER2Efficiency at 95°F outdoors	12.0-13.0
Cooling capacity	16,000-18,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	10.0-12.4
Capacity at 47°F	17,000-20,000 BTU/h
Capacity at 17°F	14,000-18,000 BTU/h
Capacity at 5°F	17,000-18,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.86-2.20
ENERGY STAR cold climate	Yes

Heating output as it gets colder100% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with MSAG11D-18HRFN10-M1 at the standard test temperatures, in BTU/h:

Certified matchups17 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.
MSAG11D-18HRFN10-M1 · cold climate	21.7	13.0	10.8	18,000	214311117
MSEPC-18HRFN10-M1 · cold climate	21.5	12.5	11.0	18,000	214311116
MSEPC-18HRFN10-M1-D · cold climate	21.4	12.5	11.0	18,000	214855567
MCB-18HRFN10-M1 · cold climate	20.7	12.5	12.2	17,500	214855414
MCB-18HRFN10-M1-D · cold climate	20.6	12.5	12.2	17,500	214855568
MUE-18HRFN10-M1 · cold climate	20.5	12.6	10.3	17,000	214855483
MUE-18HRFN10-M1-D · cold climate	20.4	12.5	10.3	17,000	214855571
MFA2-16HRFN10-M1 · cold climate	20.2	12.5	10.3	17,500	214855416
MCA4-18HRFN10-M1 · cold climate	20.0	12.5	12.4	17,000	214855415
MCA4-18HRFN10-M1-D · cold climate	20.0	12.5	12.3	17,000	214855569
MFA2-16HRFN10-M1-D · cold climate	20.0	12.5	10.3	17,500	214855570
MTJ-18HWFN10-M1 · cold climate	18.5	12.1	11.1	18,000	214861928
MTJ-18HWFN10-M1-D · cold climate	18.4	12.0	11.1	18,000	214861943
MVBC-18HWFN10-MB1 · cold climate	18.2	12.0	10.1	18,000	214861528
MTI-18HWFN10-M1 · cold climate	18.0	12.0	10.8	18,000	214855417
MTI-18HWFN10-M1-D · cold climate	18.0	12.0	10.5	18,000	214861942
MVBC-18HWFN10-MB1-D · cold climate	18.0	12.0	10.0	18,000	214861572

Yearly running cost in 10 large cities$368-$971

Phoenix, AZ$452/yr
Miami, FL$368/yr
Houston, TX$405/yr
Atlanta, GA$407/yr
Los Angeles, CA$396/yr
New York, NY$971/yr
Chicago, IL$788/yr
Denver, CO$655/yr
Seattle, WA$402/yr
Minneapolis, MN$810/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 MOX430-18HFN10-M1X?: The MDV MOX430-18HFN10-M1X is rated at up to 21.7 SEER2 and 13.0 EER2 for cooling and up to 12.4 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 17 certified matchups SEER2 ranges from 18.0-21.7.
Is the MDV MOX430-18HFN10-M1X good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 18,000 BTU/h at 5°F with a COP of 2.20, so it is still 2.2 times as efficient as electric resistance heat at that temperature.
How much does the MDV MOX430-18HFN10-M1X cost to run per year?: At its rated efficiency it costs about $368-$971 a year in electricity in large U.S. cities, depending on climate and local rates - for example $452 in Phoenix and $810 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 MOX430-18HFN10-M1X?: ENERGY STAR lists 17 certified combinations for this outdoor unit. The highest-rated ones use MSAG11D-18HRFN10-M1, MSEPC-18HRFN10-M1, MSEPC-18HRFN10-M1-D.
What refrigerant does the MDV MOX430-18HFN10-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 $447/yrYou save $462/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 MOX430-18HFN10-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: $447
Current system, per year: $909
You save per year: $462
Payback: 14.1 years
Net after 10 years: -$1,881

Cooling $276Heating $172Electricity used: 2,796 kWhSaved vs. a minimum-efficiency heat pump: $255

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.

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TCL TUM-18HA2/I2I22-21ES · cold climate22.0 SEER2 · 9.0 HSPF2
AI AIR CONDITIONING AO25-18N2-M1H · cold climate21.7 SEER2 · 12.3 HSPF2
TCL TSC-18HA2/I3TI2122.0 SEER2 · 9.0 HSPF2
CanAir 4C28SCH18H21 · cold climate21.7 SEER2 · 12.3 HSPF2
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Cooper&Hunter CH-RHP18-230VO · cold climate21.7 SEER2 · 12.3 HSPF2

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

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