What is the SEER2 rating of the MDV M6OE30-48HFN10-M1?

The MDV M6OE30-48HFN10-M1 is rated at up to 24.0 SEER2 and 12.5 EER2 for cooling and up to 10.6 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 6 certified matchups SEER2 ranges from 20.5-24.0.

Is the MDV M6OE30-48HFN10-M1 good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 38,000 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 MDV M6OE30-48HFN10-M1 cost to run per year?

At its rated efficiency it costs about $887-$2,740 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,144 in Phoenix and $2,328 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the MDV M6OE30-48HFN10-M1 the same as the MDV M6OE30-48HFN10-M1-D?

Yes, as far as the certified ratings go. ENERGY STAR lists 4 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.

42,000 BTU mini-split heat pump · M6O Series

MDV M6OE30-48HFN10-M1

Very good cooling efficiency and average heating efficiency for a 42,000 BTU mini-split heat pump, and certified for cold climates.

Ranks #1 of 61 42,000 BTU mini-splits for cooling efficiency, and costs about $1,110 a year to run in a mixed climate like Atlanta.

SEER2: 24.0 Cooling efficiency over a season
Very good · beats 75%
HSPF2: 10.6 Heating efficiency over a season
Average · beats 65%
EER2: 12.5 Cooling efficiency on a 95°F day
Average · beats 44%
Heat at 5°F: 38,000 BTU/h75% of its 47°F output
Average · beats 67%

A good fit if…

You want low cooling bills - its SEER2 beats 75% of mini-splits.
Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 38,000 BTU/h at 5°F.
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

Specifications42,000 BTU, R-454B

General
Brand	MDV
Also sold as	Mainline
Outdoor unit model	M6OE30-48HFN10-M1
Series	M6O Series
Type	Mini-split heat pump
Nominal size	42,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	November 1, 2015
Last certified	May 6, 2026
Cooling
SEER2Seasonal efficiency, higher is better	24.0 (range 20.5-24.0)
EER2Efficiency at 95°F outdoors	11.7-12.5
Cooling capacity	45,000-47,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	10.0-10.6
Capacity at 47°F	47,000-48,000 BTU/h
Capacity at 17°F	36,800-40,000 BTU/h
Capacity at 5°F	36,000-38,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.00-2.10
ENERGY STAR cold climate	Yes

Heating output as it gets colder75% kept at 5°F

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

Certified matchups6 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.
- · cold climate	24.0	12.5	10.4	36,000	214861740
- · cold climate	22.3	12.3	10.5	37,000	214861742
- · cold climate	21.3	11.7	10.0	36,000	214861803
- · cold climate	20.9	11.9	10.3	37,000	214861805
- · cold climate	20.5	12.0	10.6	38,000	214861804
- · cold climate	20.5	12.0	10.6	38,000	214861741

Same unit, other model numbers3

These model numbers have exactly the same certified ratings and matchups as the MDV M6OE30-48HFN10-M1: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

MDV M6OE30-48HFN10-M1-D
MDV M6OE30-48HFN10-M1D-D
Mainline ML48HP230MUL-O

Yearly running cost in 10 large cities$887-$2,740

Phoenix, AZ$1,144/yr
Miami, FL$887/yr
Houston, TX$1,028/yr
Atlanta, GA$1,110/yr
Los Angeles, CA$1,096/yr
New York, NY$2,740/yr
Chicago, IL$2,241/yr
Denver, CO$1,876/yr
Seattle, WA$1,164/yr
Minneapolis, MN$2,328/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 M6OE30-48HFN10-M1?: The MDV M6OE30-48HFN10-M1 is rated at up to 24.0 SEER2 and 12.5 EER2 for cooling and up to 10.6 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 6 certified matchups SEER2 ranges from 20.5-24.0.
Is the MDV M6OE30-48HFN10-M1 good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 38,000 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 MDV M6OE30-48HFN10-M1 cost to run per year?: At its rated efficiency it costs about $887-$2,740 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,144 in Phoenix and $2,328 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the MDV M6OE30-48HFN10-M1 the same as the MDV M6OE30-48HFN10-M1-D?: Yes, as far as the certified ratings go. ENERGY STAR lists 4 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.
What refrigerant does the MDV M6OE30-48HFN10-M1 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 $1,162/yrYou save $1,199/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 M6OE30-48HFN10-M1

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: $1,162
Current system, per year: $2,361
You save per year: $1,199
Payback: 14.2 years
Net after 10 years: -$5,007

Cooling $660Heating $502Electricity used: 7,262 kWhSaved vs. a minimum-efficiency heat pump: $655

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 42,000 BTU models

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AUX ASUM42HPMULO · cold climate24.0 SEER2 · 10.5 HSPF2
DELLA 048-TCQ-MODU-1D5 · cold climate24.0 SEER2 · 10.0 HSPF2
TCL H42FMH22XQC · cold climate24.0 SEER2 · 10.0 HSPF2
TCL TMH42HDI2NAO0U25 · cold climate24.0 SEER2 · 10.0 HSPF2
York YRAMX42N5HBA · cold climate23.0 SEER2 · 10.5 HSPF2
York YRAMG42N5HAA23.0 SEER2 · 9.2 HSPF2
TOSHIBA CARRIER RAV-BP421AT2P-UL · cold climate22.6 SEER2 · 11.2 HSPF2

See all 61 42,000 BTU mini-splits, ranked

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