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

The MRCOOL DIY-12-HP-C-115C is rated at up to 22.5 SEER2 and 12.5 EER2 for cooling and up to 9.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.

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

It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 12,000 BTU model.

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

At its rated efficiency it costs about $253-$809 a year in electricity in large U.S. cities, depending on climate and local rates - for example $330 in Phoenix and $690 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-115C the same as the MRCOOL DIY-12-HP-C-115C25?

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.

Which indoor units work with the MRCOOL DIY-12-HP-C-115C?

ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses DIY-12-HP-WMAH-115C25.

What refrigerant does the MRCOOL DIY-12-HP-C-115C use?

It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and R-32.

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

MRCOOL DIY-12-HP-C-115C

Average cooling efficiency and below average heating efficiency for a 12,000 BTU mini-split heat pump, but not rated for cold climates.

Ranks #281 of 394 12,000 BTU mini-splits for cooling efficiency, and costs about $326 a year to run in a mixed climate like Atlanta.

SEER2: 22.5 Cooling efficiency over a season
Average · beats 56%
HSPF2: 9.0 Heating efficiency over a season
Below average · beats 10%
EER2: 12.5 Cooling efficiency on a 95°F day
Average · beats 44%
Heat at 5°F: 6,400 BTU/h53% of its 47°F output
Below average · beats 36%

A good fit if…

You want steady temperatures and quiet running - the compressor varies its speed.

Think twice if…

You often see nights below 0°F - it is not cold-climate certified.
You mainly need heat - its HSPF2 is below average for mini-splits.
You want the newest refrigerant - it uses R-410A, which is being phased down.

Calculate my running cost

Details

Specifications12,000 BTU, R-410A

General
Brand	MRCOOL
Also sold as	Blueridge, Coast air
Outdoor unit model	DIY-12-HP-C-115C
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-410A
Connected (smart) capable	No
On the market since	December 18, 2019
Last certified	March 4, 2025
Cooling
SEER2Seasonal efficiency, higher is better	22.5 (range 22.5)
EER2Efficiency at 95°F outdoors	12.5
Cooling capacity	12,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	9.0
Capacity at 47°F	12,000 BTU/h
Capacity at 17°F	7,500 BTU/h
Capacity at 5°F	6,400 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.96
ENERGY STAR cold climate	No

Heating output as it gets colder53% 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-115C25 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-115C25	22.5	12.5	9.0	6,400	207339187

Same unit, other model numbers3

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

MRCOOL DIY-12-HP-C-115C25
Blueridge BMY12DIY22C
Coast air A-CAD12-0A

Yearly running cost in 10 large cities$253-$809

Phoenix, AZ$330/yr
Miami, FL$253/yr
Houston, TX$297/yr
Atlanta, GA$326/yr
Los Angeles, CA$322/yr
New York, NY$809/yr
Chicago, IL$663/yr
Denver, CO$556/yr
Seattle, WA$346/yr
Minneapolis, MN$690/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-115C?: The MRCOOL DIY-12-HP-C-115C is rated at up to 22.5 SEER2 and 12.5 EER2 for cooling and up to 9.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
Is the MRCOOL DIY-12-HP-C-115C good for cold climates?: It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 12,000 BTU model.
How much does the MRCOOL DIY-12-HP-C-115C cost to run per year?: At its rated efficiency it costs about $253-$809 a year in electricity in large U.S. cities, depending on climate and local rates - for example $330 in Phoenix and $690 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-115C the same as the MRCOOL DIY-12-HP-C-115C25?: 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.
Which indoor units work with the MRCOOL DIY-12-HP-C-115C?: ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses DIY-12-HP-WMAH-115C25.
What refrigerant does the MRCOOL DIY-12-HP-C-115C use?: It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and R-32.

Running cost and savings

Pre-filled with this model. Pick your city and what you heat with today; everything else is optional.

Heat pump $337/yrYou save $282/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-115C

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: $337
Current system, per year: $619
You save per year: $282
Payback: 16.0 years
Net after 10 years: -$1,683

Cooling $188Heating $149Electricity used: 2,107 kWhSaved vs. a minimum-efficiency heat pump: $138

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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1HVAC EZ-12ZPL-HP11522.5 SEER2 · 9.0 HSPF2
Star Air Kontrol SAK-12-OCT2/220V · cold climate22.1 SEER2 · 10.0 HSPF2
HAVELLS GHS12H5MWAHD05 · cold climate22.5 SEER2 · 9.7 HSPF2
Mitsubishi Electric SUZ-KA12NA22.0 SEER2 · 11.9 HSPF2
Deye DWA4-12KR2(US)22.5 SEER2 · 9.7 HSPF2
Trane / Mitsubishi Electric NTXSKS12A11222.0 SEER2 · 11.9 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.