What is the SEER2 rating of the MRCOOL DIY-12-HP-C-115D25-O?

The MRCOOL DIY-12-HP-C-115D25-O is rated at up to 23.5 SEER2 and 12.5 EER2 for cooling and up to 10.2 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.

Is the MRCOOL DIY-12-HP-C-115D25-O good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 8,400 BTU/h at 5°F with a COP of 2.08, so it is still 2.1 times as efficient as electric resistance heat at that temperature.

How much does the MRCOOL DIY-12-HP-C-115D25-O cost to run per year?

At its rated efficiency it costs about $241-$724 a year in electricity in large U.S. cities, depending on climate and local rates - for example $308 in Phoenix and $613 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the MRCOOL DIY-12-HP-C-115D25-O the same as the MRCOOL DIYP-12-HP-C-115DE11-O?

Yes, as far as the certified ratings go. ENERGY STAR lists 5 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 MRCOOL DIY-12-HP-C-115D25-O?

ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses DIY-12-HP-WMAH-115D25-O.

12,000 BTU mini-split heat pump · DIY Series

MRCOOL DIY-12-HP-C-115D25-O

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

Ranks #209 of 394 12,000 BTU mini-splits for cooling efficiency, and costs about $295 a year to run in a mixed climate like Atlanta.

SEER2: 23.5 Cooling efficiency over a season
Very good · beats 70%
HSPF2: 10.2 Heating efficiency over a season
Average · beats 53%
EER2: 12.5 Cooling efficiency on a 95°F day
Average · beats 44%
Heat at 5°F: 8,400 BTU/h70% of its 47°F output
Average · beats 62%

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 8,400 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

Specifications12,000 BTU, R-454B

General
Brand	MRCOOL
Also sold as	MDV, Blueridge, Coast air
Outdoor unit model	DIY-12-HP-C-115D25-O
Series	DIY 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	October 25, 2024
Last certified	March 4, 2025
Cooling
SEER2Seasonal efficiency, higher is better	23.5 (range 23.5)
EER2Efficiency at 95°F outdoors	12.5
Cooling capacity	12,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	10.2
Capacity at 47°F	12,000 BTU/h
Capacity at 17°F	8,500 BTU/h
Capacity at 5°F	8,400 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.08
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 matchup with DIY-12-HP-WMAH-115D25-O 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.
DIY-12-HP-WMAH-115D25-O · cold climate	23.5	12.5	10.2	8,400	216032544

Same unit, other model numbers4

These model numbers have exactly the same certified ratings and matchups as the MRCOOL DIY-12-HP-C-115D25-O: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

MRCOOL DIYP-12-HP-C-115DE11-O
MDV MOX230-12HFPN10-B1
Blueridge BDS2A12SCV
Coast air A-CAD12-0B

Yearly running cost in 10 large cities$241-$724

Phoenix, AZ$308/yr
Miami, FL$241/yr
Houston, TX$277/yr
Atlanta, GA$295/yr
Los Angeles, CA$290/yr
New York, NY$724/yr
Chicago, IL$591/yr
Denver, CO$494/yr
Seattle, WA$306/yr
Minneapolis, MN$613/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 MRCOOL DIY-12-HP-C-115D25-O?: The MRCOOL DIY-12-HP-C-115D25-O is rated at up to 23.5 SEER2 and 12.5 EER2 for cooling and up to 10.2 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
Is the MRCOOL DIY-12-HP-C-115D25-O good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 8,400 BTU/h at 5°F with a COP of 2.08, so it is still 2.1 times as efficient as electric resistance heat at that temperature.
How much does the MRCOOL DIY-12-HP-C-115D25-O cost to run per year?: At its rated efficiency it costs about $241-$724 a year in electricity in large U.S. cities, depending on climate and local rates - for example $308 in Phoenix and $613 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the MRCOOL DIY-12-HP-C-115D25-O the same as the MRCOOL DIYP-12-HP-C-115DE11-O?: Yes, as far as the certified ratings go. ENERGY STAR lists 5 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 MRCOOL DIY-12-HP-C-115D25-O?: ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses DIY-12-HP-WMAH-115D25-O.
What refrigerant does the MRCOOL DIY-12-HP-C-115D25-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 $312/yrYou save $307/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-12-HP-C-115D25-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: $312
Current system, per year: $619
You save per year: $307
Payback: 14.6 years
Net after 10 years: -$1,428

Cooling $180Heating $132Electricity used: 1,947 kWhSaved vs. a minimum-efficiency heat pump: $163

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

InfinityLiving EZ-12ZPL-HP115B · cold climate23.5 SEER2 · 10.2 HSPF2
Blueridge BDS3A12UC0 · cold climate23.5 SEER2 · 10.0 HSPF2
MDV MOX230-12HFN10-B123.5 SEER2 · 10.4 HSPF2
Bosch BMS500-AAS012-0CSXRC23.5 SEER2 · 10.0 HSPF2
MDV MOX230-12HFN1-BW0W23.5 SEER2 · 10.4 HSPF2
ComfortStar CZP12CA(O)23.5 SEER2 · 10.0 HSPF2
Comfortmaker DLCSRBH12AAJ23.5 SEER2 · 10.4 HSPF2
Concord 4DHP2S12S-1L23.5 SEER2 · 10.0 HSPF2

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

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