What is the SEER2 rating of the MRCOOL DIY-MULTI4-27HP230D-O?

The MRCOOL DIY-MULTI4-27HP230D-O is rated at up to 23.0 SEER2 and 12.0 EER2 for cooling and up to 9.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 3 certified matchups SEER2 ranges from 20.0-23.0.

Is the MRCOOL DIY-MULTI4-27HP230D-O good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 19,200 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 MRCOOL DIY-MULTI4-27HP230D-O cost to run per year?

At its rated efficiency it costs about $535-$1,691 a year in electricity in large U.S. cities, depending on climate and local rates - for example $696 in Phoenix and $1,441 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the MRCOOL DIY-MULTI4-27HP230D-O the same as the MDV M4OD30-27HFPN10-M1D?

Yes, as far as the certified ratings go. ENERGY STAR lists 3 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.

24,000 BTU mini-split heat pump · DIY Series

MRCOOL DIY-MULTI4-27HP230D-O

Average cooling efficiency and below average heating efficiency for a 24,000 BTU mini-split heat pump, and certified for cold climates.

Ranks #120 of 430 24,000 BTU mini-splits for cooling efficiency, and costs about $682 a year to run in a mixed climate like Atlanta.

SEER2: 23.0 Cooling efficiency over a season
Average · beats 62%
HSPF2: 9.5 Heating efficiency over a season
Below average · beats 24%
EER2: 12.0 Cooling efficiency on a 95°F day
Below average · beats 25%
Heat at 5°F: 19,200 BTU/h70% of its 47°F output
Average · beats 67%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 19,200 BTU/h at 5°F.
You want steady temperatures and quiet running - the compressor varies its speed.

Think twice if…

You mainly need heat - its HSPF2 is below average for mini-splits.

Calculate my running cost

Details

Specifications24,000 BTU, R-454B

General
Brand	MRCOOL
Also sold as	MDV, Blueridge
Outdoor unit model	DIY-MULTI4-27HP230D-O
Series	DIY Series
Type	Mini-split heat pump
Nominal size	24,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	October 25, 2024
Last certified	March 4, 2025
Cooling
SEER2Seasonal efficiency, higher is better	23.0 (range 20.0-23.0)
EER2Efficiency at 95°F outdoors	12.0
Cooling capacity	26,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	9.0-9.5
Capacity at 47°F	26,000-27,000 BTU/h
Capacity at 17°F	16,200-19,000 BTU/h
Capacity at 5°F	18,200-19,200 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 colder70% 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 matchups3 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	23.0	12.0	9.0	18,200	216032589
- · cold climate	21.5	12.0	9.3	18,700	216032591
- · cold climate	20.0	12.0	9.5	19,200	216032590

Same unit, other model numbers2

These model numbers have exactly the same certified ratings and matchups as the MRCOOL DIY-MULTI4-27HP230D-O: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

MDV M4OD30-27HFPN10-M1D
Blueridge BDM1A27SC0

Yearly running cost in 10 large cities$535-$1,691

Phoenix, AZ$696/yr
Miami, FL$535/yr
Houston, TX$625/yr
Atlanta, GA$682/yr
Los Angeles, CA$675/yr
New York, NY$1,691/yr
Chicago, IL$1,385/yr
Denver, CO$1,161/yr
Seattle, WA$721/yr
Minneapolis, MN$1,441/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 MRCOOL DIY-MULTI4-27HP230D-O?: The MRCOOL DIY-MULTI4-27HP230D-O is rated at up to 23.0 SEER2 and 12.0 EER2 for cooling and up to 9.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 3 certified matchups SEER2 ranges from 20.0-23.0.
Is the MRCOOL DIY-MULTI4-27HP230D-O good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 19,200 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 MRCOOL DIY-MULTI4-27HP230D-O cost to run per year?: At its rated efficiency it costs about $535-$1,691 a year in electricity in large U.S. cities, depending on climate and local rates - for example $696 in Phoenix and $1,441 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the MRCOOL DIY-MULTI4-27HP230D-O the same as the MDV M4OD30-27HFPN10-M1D?: Yes, as far as the certified ratings go. ENERGY STAR lists 3 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 MRCOOL DIY-MULTI4-27HP230D-O 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 $709/yrYou save $638/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 MRCOOL DIY-MULTI4-27HP230D-O

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: $709
Current system, per year: $1,347
You save per year: $638
Payback: 15.7 years
Net after 10 years: -$3,620

Cooling $398Heating $311Electricity used: 4,432 kWhSaved vs. a minimum-efficiency heat pump: $325

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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See all 430 24,000 BTU mini-splits, ranked

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