What is the SEER2 rating of the ECO AC EHH-O18BB?

The ECO AC EHH-O18BB is rated at up to 23.7 SEER2 and 13.5 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 3 certified matchups SEER2 ranges from 20.0-23.7.

Is the ECO AC EHH-O18BB good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 13,000 BTU/h at 5°F with a COP of 2.40, so it is still 2.4 times as efficient as electric resistance heat at that temperature.

How much does the ECO AC EHH-O18BB cost to run per year?

At its rated efficiency it costs about $340-$1,088 a year in electricity in large U.S. cities, depending on climate and local rates - for example $444 in Phoenix and $928 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Which indoor units work with the ECO AC EHH-O18BB?

ENERGY STAR lists 3 certified combinations for this outdoor unit. The highest-rated ones use EHH-W18BB, EHH-C18BA, EHH-D18BA.

What refrigerant does the ECO AC EHH-O18BB 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.

18,000 BTU mini-split heat pump · E-series

ECO AC EHH-O18BB

Very good cooling efficiency and average heating efficiency for a 18,000 BTU mini-split heat pump, and certified for cold climates.

Ranks #105 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $438 a year to run in a mixed climate like Atlanta.

SEER2: 23.7 Cooling efficiency over a season
Very good · beats 72%
HSPF2: 10.6 Heating efficiency over a season
Average · beats 65%
EER2: 13.5 Cooling efficiency on a 95°F day
Very good · beats 74%
Heat at 5°F: 13,000 BTU/h70% of its 47°F output
Excellent · beats 93%

A good fit if…

You want low cooling bills - its SEER2 beats 72% of mini-splits.
Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 13,000 BTU/h at 5°F.
You want steady temperatures and quiet running - the compressor varies its speed.

Think twice if…

You want the newest refrigerant - it uses R-410A, which is being phased down.

Calculate my running cost

Details

Specifications18,000 BTU, R-410A

General
Brand	ECO AC
Outdoor unit model	EHH-O18BB
Series	E-series
Type	Mini-split heat pump
Nominal size	18,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	October 15, 2022
Last certified	April 27, 2026
Cooling
SEER2Seasonal efficiency, higher is better	23.7 (range 20.0-23.7)
EER2Efficiency at 95°F outdoors	12.5-13.5
Cooling capacity	16,000-18,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	10.3-10.6
Capacity at 47°F	18,000-20,000 BTU/h
Capacity at 17°F	12,000-14,000 BTU/h
Capacity at 5°F	12,600-13,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.16-2.40
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 EHH-W18BB 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.
EHH-W18BB · cold climate	23.7	13.5	10.3	12,600	207825492
EHH-C18BA	20.5	12.5	10.5	12,700	210586148
EHH-D18BA	20.0	12.5	10.6	13,000	207825496

Yearly running cost in 10 large cities$340-$1,088

Phoenix, AZ$444/yr
Miami, FL$340/yr
Houston, TX$399/yr
Atlanta, GA$438/yr
Los Angeles, CA$434/yr
New York, NY$1,088/yr
Chicago, IL$891/yr
Denver, CO$748/yr
Seattle, WA$464/yr
Minneapolis, MN$928/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 ECO AC EHH-O18BB?: The ECO AC EHH-O18BB is rated at up to 23.7 SEER2 and 13.5 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 3 certified matchups SEER2 ranges from 20.0-23.7.
Is the ECO AC EHH-O18BB good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 13,000 BTU/h at 5°F with a COP of 2.40, so it is still 2.4 times as efficient as electric resistance heat at that temperature.
How much does the ECO AC EHH-O18BB cost to run per year?: At its rated efficiency it costs about $340-$1,088 a year in electricity in large U.S. cities, depending on climate and local rates - for example $444 in Phoenix and $928 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Which indoor units work with the ECO AC EHH-O18BB?: ENERGY STAR lists 3 certified combinations for this outdoor unit. The highest-rated ones use EHH-W18BB, EHH-C18BA, EHH-D18BA.
What refrigerant does the ECO AC EHH-O18BB 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 $453/yrYou save $456/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 ECO AC EHH-O18BB

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: $453
Current system, per year: $909
You save per year: $456
Payback: 14.3 years
Net after 10 years: -$1,940

Cooling $252Heating $201Electricity used: 2,833 kWhSaved vs. a minimum-efficiency heat pump: $249

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 18,000 BTU models

DUCTLESSAIRE 454-18-O-DA · cold climate23.7 SEER2 · 11.9 HSPF2
KANIONco KWSM-18IR410AHS23.5MV · cold climate23.7 SEER2 · 10.3 HSPF2
Lennox MMPD018S6S-1P · cold climate23.8 SEER2 · 9.3 HSPF2
Star Air Kontrol SAK-18-24MS/220 · cold climate23.7 SEER2 · 10.3 HSPF2
Samsung AC018DXSCCG · cold climate23.8 SEER2 · 9.6 HSPF2
Bosch BMS500-AAS018-1CSXRD · cold climate23.5 SEER2 · 12.2 HSPF2
Lennox MMLD018S6S-1P · cold climate23.8 SEER2 · 9.6 HSPF2
ECO-AIR EDSO-18E · cold climate23.5 SEER2 · 12.2 HSPF2

See all 465 18,000 BTU mini-splits, ranked

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