What is the SEER2 rating of the DIYCOOL ES-27Z-M3B?

The DIYCOOL ES-27Z-M3B is rated at up to 24.6 SEER2 and 12.7 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 15 certified matchups SEER2 ranges from 21.0-24.6.

Is the DIYCOOL ES-27Z-M3B 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 30,000 BTU model.

How much does the DIYCOOL ES-27Z-M3B cost to run per year?

At its rated efficiency it costs about $540-$1,779 a year in electricity in large U.S. cities, depending on climate and local rates - for example $712 in Phoenix and $1,522 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

What refrigerant does the DIYCOOL ES-27Z-M3B 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.

30,000 BTU mini-split heat pump · ES SERIES

DIYCOOL ES-27Z-M3B

Very good cooling efficiency and below average heating efficiency for a 30,000 BTU mini-split heat pump, but not rated for cold climates.

Ranks #10 of 171 30,000 BTU mini-splits for cooling efficiency, and costs about $712 a year to run in a mixed climate like Atlanta.

SEER2: 24.6 Cooling efficiency over a season
Very good · beats 80%
HSPF2: 9.5 Heating efficiency over a season
Below average · beats 24%
EER2: 12.7 Cooling efficiency on a 95°F day
Average · beats 54%
Heat at 5°F: 19,000 BTU/h68% of its 47°F output
Average · beats 48%

A good fit if…

You want low cooling bills - its SEER2 beats 80% of mini-splits.
You want steady temperatures and quiet running - the compressor varies its speed.
You want a choice of indoor units - 15 certified pairings.

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

Specifications30,000 BTU, R-410A

General
Brand	DIYCOOL
Also sold as	ACIQ, 1HVAC, PolarWave, STEALTH
Outdoor unit model	ES-27Z-M3B
Series	ES SERIES
Type	Mini-split heat pump
Nominal size	30,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	October 1, 2022
Last certified	April 27, 2026
Cooling
SEER2Seasonal efficiency, higher is better	24.6 (range 21.0-24.6)
EER2Efficiency at 95°F outdoors	11.7-12.7
Cooling capacity	28,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	9.2-9.5
Capacity at 47°F	28,000 BTU/h
Capacity at 17°F	21,000-22,000 BTU/h
Capacity at 5°F	18,700-19,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.00
ENERGY STAR cold climate	No

Heating output as it gets colder68% 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 matchups15 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.
- ACIQ	24.6	12.7	9.5	19,000	210857386
-	24.6	12.7	9.5	19,000	210857404
- 1HVAC	24.6	12.7	9.5	19,000	210857368
- PolarWave	24.6	12.7	9.5	19,000	212316123
- STEALTH	24.6	12.7	9.5	19,000	212316209
- PolarWave	22.8	12.2	9.4	18,800	212316125
- STEALTH	22.8	12.2	9.4	18,800	212316211
-	22.8	12.2	9.4	18,800	210857406
- ACIQ	22.8	12.2	9.4	18,800	210857388
- 1HVAC	22.8	12.2	9.4	18,800	210857370
-	21.0	11.7	9.2	18,700	210857405
- ACIQ	21.0	11.7	9.2	18,700	210857387
- 1HVAC	21.0	11.7	9.2	18,700	210857369
- PolarWave	21.0	11.7	9.2	18,700	212316124
- STEALTH	21.0	11.7	9.2	18,700	212316210

Yearly running cost in 10 large cities$540-$1,779

Phoenix, AZ$712/yr
Miami, FL$540/yr
Houston, TX$640/yr
Atlanta, GA$712/yr
Los Angeles, CA$707/yr
New York, NY$1,779/yr
Chicago, IL$1,459/yr
Denver, CO$1,226/yr
Seattle, WA$763/yr
Minneapolis, MN$1,522/yr

At each state's average electricity price and the city's typical heating and cooling hours.

Questions4

What is the SEER2 rating of the DIYCOOL ES-27Z-M3B?: The DIYCOOL ES-27Z-M3B is rated at up to 24.6 SEER2 and 12.7 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 15 certified matchups SEER2 ranges from 21.0-24.6.
Is the DIYCOOL ES-27Z-M3B 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 30,000 BTU model.
How much does the DIYCOOL ES-27Z-M3B cost to run per year?: At its rated efficiency it costs about $540-$1,779 a year in electricity in large U.S. cities, depending on climate and local rates - for example $712 in Phoenix and $1,522 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
What refrigerant does the DIYCOOL ES-27Z-M3B 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 $731/yrYou save $713/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 DIYCOOL ES-27Z-M3B

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: $731
Current system, per year: $1,444
You save per year: $713
Payback: 14.7 years
Net after 10 years: -$3,370

Cooling $401Heating $330Electricity used: 4,567 kWhSaved vs. a minimum-efficiency heat pump: $377

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 30,000 BTU models

DIRECT AIR DIRM-27DA25-3Z24.6 SEER2 · 9.5 HSPF2
Kaden KO-PS327HP-2AAMA24.6 SEER2 · 9.5 HSPF2
C&H CH-28MES-230VO24.6 SEER2 · 9.5 HSPF2
MDV M3OJ-27HFN1-M24.6 SEER2 · 9.5 HSPF2
Bosch BMS500-AAM027-1CSXRC24.6 SEER2 · 9.5 HSPF2
MRCOOL MULTI3-27HP230B24.6 SEER2 · 9.5 HSPF2
WeatherMaker 37MGRAQ30EA3 · cold climate25.0 SEER2 · 10.0 HSPF2
Armstrong Air 4DHP2S30M-1P24.6 SEER2 · 9.3 HSPF2

See all 171 30,000 BTU mini-splits, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of April 27, 2026. How we use the data.