What is the SEER2 rating of the Custom Comfort CCOESBSZ17HP?

The Custom Comfort CCOESBSZ17HP is rated at up to 23.8 SEER2 and 12.5 EER2 for cooling and up to 13.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 7 certified matchups SEER2 ranges from 18.5-23.8.

Is the Custom Comfort CCOESBSZ17HP good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 14,200 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 Custom Comfort CCOESBSZ17HP cost to run per year?

At its rated efficiency it costs about $352-$863 a year in electricity in large U.S. cities, depending on climate and local rates - for example $425 in Phoenix and $712 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the Custom Comfort CCOESBSZ17HP the same as the Sea Breeze SZ18H525ZMO?

Yes, as far as the certified ratings go. ENERGY STAR lists both 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 Custom Comfort CCOESBSZ17HP?

ENERGY STAR lists 7 certified combinations for this outdoor unit. The highest-rated ones use CCOXHBFM18, CCOXHBWM18, CCOXHBFC18.

18,000 BTU mini-split heat pump · CCO Series

Custom Comfort CCOESBSZ17HP

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

Ranks #98 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $369 a year to run in a mixed climate like Atlanta.

SEER2: 23.8 Cooling efficiency over a season
Very good · beats 72%
HSPF2: 13.5 Heating efficiency over a season
Excellent · beats 96%
EER2: 12.5 Cooling efficiency on a 95°F day
Average · beats 44%
Heat at 5°F: 14,200 BTU/h77% 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 14,200 BTU/h at 5°F.
It will heat most of the year - its HSPF2 beats 96% of mini-splits.
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

Specifications18,000 BTU, R-454B

General
Brand	Custom Comfort
Also sold as	Sea Breeze
Outdoor unit model	CCOESBSZ17HP
Series	CCO Series
Type	Mini-split heat pump
Nominal size	18,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	November 5, 2025
Last certified	June 4, 2026
Cooling
SEER2Seasonal efficiency, higher is better	23.8 (range 18.5-23.8)
EER2Efficiency at 95°F outdoors	12.1-13.3
Cooling capacity	16,000-18,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	9.8-13.5
Capacity at 47°F	17,000-20,000 BTU/h
Capacity at 17°F	13,200-15,000 BTU/h
Capacity at 5°F	12,800-14,200 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.05-2.40
ENERGY STAR cold climate	Yes

Heating output as it gets colder77% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with CCOXHBFM18 at the standard test temperatures, in BTU/h:

Certified matchups7 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.
CCOXHBFM18 · cold climate	23.8	12.5	13.5	13,100	218425835
CCOXHBWM18 · cold climate	23.5	12.7	10.8	12,800	217968401
CCOXHBFC18 · cold climate	22.3	12.5	10.4	12,800	218425836
CCOXHB1C18 · cold climate	22.2	12.5	12.2	13,100	218425840
CCOXHB4C18 · cold climate	20.7	12.5	11.4	12,800	218425827
CCOXHBSD18 · cold climate	20.0	13.3	11.3	14,200	218425831
CCOXHBAHU18 · cold climate	18.5	12.1	9.8	13,000	218425841

Same unit, other model numbers1

These model numbers have exactly the same certified ratings and matchups as the Custom Comfort CCOESBSZ17HP: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

Sea Breeze SZ18H525ZMO

Yearly running cost in 10 large cities$352-$863

Phoenix, AZ$425/yr
Miami, FL$354/yr
Houston, TX$380/yr
Atlanta, GA$369/yr
Los Angeles, CA$356/yr
New York, NY$863/yr
Chicago, IL$697/yr
Denver, CO$576/yr
Seattle, WA$352/yr
Minneapolis, MN$712/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 Custom Comfort CCOESBSZ17HP?: The Custom Comfort CCOESBSZ17HP is rated at up to 23.8 SEER2 and 12.5 EER2 for cooling and up to 13.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 7 certified matchups SEER2 ranges from 18.5-23.8.
Is the Custom Comfort CCOESBSZ17HP good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 14,200 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 Custom Comfort CCOESBSZ17HP cost to run per year?: At its rated efficiency it costs about $352-$863 a year in electricity in large U.S. cities, depending on climate and local rates - for example $425 in Phoenix and $712 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the Custom Comfort CCOESBSZ17HP the same as the Sea Breeze SZ18H525ZMO?: Yes, as far as the certified ratings go. ENERGY STAR lists both 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 Custom Comfort CCOESBSZ17HP?: ENERGY STAR lists 7 certified combinations for this outdoor unit. The highest-rated ones use CCOXHBFM18, CCOXHBWM18, CCOXHBFC18.
What refrigerant does the Custom Comfort CCOESBSZ17HP 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 $416/yrYou save $513/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 Custom Comfort CCOESBSZ17HP

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: $416
Current system, per year: $928
You save per year: $513
Payback: 13.7 years
Net after 10 years: -$1,874

Cooling $266Heating $149Electricity used: 2,597 kWhSaved vs. a minimum-efficiency heat pump: $296

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

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MRCOOL DIY-MULTI3-18HP230D-O · cold climate23.9 SEER2 · 10.0 HSPF2
Pioneer YN018GMSI24RPG · cold climate23.8 SEER2 · 13.5 HSPF2
InfinityLiving EZ-18Z-M2B · cold climate23.9 SEER2 · 10.0 HSPF2
Lennox MMLD018S6S-1P · cold climate23.8 SEER2 · 9.6 HSPF2
Carrier 37MARAQ18AA3 · cold climate23.9 SEER2 · 13.5 HSPF2
Samsung AC018DXSCCG · cold climate23.8 SEER2 · 9.6 HSPF2

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

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of June 4, 2026. How we use the data.