What is the SEER2 rating of the Sea Breeze CSZ36H424ZMO?

The Sea Breeze CSZ36H424ZMO is rated at up to 19.4 SEER2 and 9.5 EER2 for cooling and up to 10.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.

Is the Sea Breeze CSZ36H424ZMO good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 40,000 BTU/h at 5°F with a COP of 1.85, so it is still 1.9 times as efficient as electric resistance heat at that temperature.

How much does the Sea Breeze CSZ36H424ZMO cost to run per year?

At its rated efficiency it costs about $873-$2,392 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,084 in Phoenix and $2,005 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 Sea Breeze CSZ36H424ZMO?

ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses SEA BREEZE+ CA36H424ZMI.

What refrigerant does the Sea Breeze CSZ36H424ZMO 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.

36,000 BTU mini-split heat pump · CSZ Sseies

Sea Breeze CSZ36H424ZMO

Below average cooling efficiency and average heating efficiency for a 36,000 BTU mini-split heat pump, and certified for cold climates.

Ranks #183 of 205 36,000 BTU mini-splits for cooling efficiency, and costs about $995 a year to run in a mixed climate like Atlanta.

SEER2: 19.4 Cooling efficiency over a season
Below average · beats 11%
HSPF2: 10.5 Heating efficiency over a season
Average · beats 61%
EER2: 9.5 Cooling efficiency on a 95°F day
Below average · beats 3%
Heat at 5°F: 40,000 BTU/h100% of its 47°F output
Below average · beats 20%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 40,000 BTU/h at 5°F.
You want steady temperatures and quiet running - the compressor varies its speed.

Think twice if…

Cooling cost matters most - its SEER2 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

Specifications36,000 BTU, R-410A

General
Brand	Sea Breeze
Outdoor unit model	CSZ36H424ZMO
Series	CSZ Sseies
Type	Mini-split heat pump
Nominal size	36,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	February 28, 2025
Last certified	May 28, 2026
Cooling
SEER2Seasonal efficiency, higher is better	19.4 (range 19.4)
EER2Efficiency at 95°F outdoors	9.5
Cooling capacity	36,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	10.5
Capacity at 47°F	40,000 BTU/h
Capacity at 17°F	33,000 BTU/h
Capacity at 5°F	40,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.85
ENERGY STAR cold climate	Yes

Heating output as it gets colder100% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with CA36H424ZMI 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.
CA36H424ZMI SEA BREEZE+ · cold climate	19.4	9.5	10.5	40,000	208128274

Yearly running cost in 10 large cities$873-$2,392

Phoenix, AZ$1,084/yr
Miami, FL$873/yr
Houston, TX$972/yr
Atlanta, GA$995/yr
Los Angeles, CA$971/yr
New York, NY$2,392/yr
Chicago, IL$1,945/yr
Denver, CO$1,619/yr
Seattle, WA$997/yr
Minneapolis, MN$2,005/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 Sea Breeze CSZ36H424ZMO?: The Sea Breeze CSZ36H424ZMO is rated at up to 19.4 SEER2 and 9.5 EER2 for cooling and up to 10.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
Is the Sea Breeze CSZ36H424ZMO good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 40,000 BTU/h at 5°F with a COP of 1.85, so it is still 1.9 times as efficient as electric resistance heat at that temperature.
How much does the Sea Breeze CSZ36H424ZMO cost to run per year?: At its rated efficiency it costs about $873-$2,392 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,084 in Phoenix and $2,005 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 Sea Breeze CSZ36H424ZMO?: ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses SEA BREEZE+ CA36H424ZMI.
What refrigerant does the Sea Breeze CSZ36H424ZMO 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 $1,080/yrYou save $842/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 Sea Breeze CSZ36H424ZMO

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: $1,080
Current system, per year: $1,922
You save per year: $842
Payback: 16.0 years
Net after 10 years: -$5,082

Cooling $653Heating $427Electricity used: 6,749 kWhSaved vs. a minimum-efficiency heat pump: $404

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 36,000 BTU models

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MDV MOE30U-36HFN1-M(GA)-L · cold climate19.4 SEER2 · 11.0 HSPF2
Mitsubishi Electric MXZ-5D36NL19.2 SEER2 · 9.3 HSPF2
MDV MOE30U-36HFN1-M(GA) · cold climate19.4 SEER2 · 11.0 HSPF2
Carrier 38VMB036HDS3-119.2 SEER2 · 9.2 HSPF2
Lennox MLB036S4S-2P · cold climate19.4 SEER2 · 11.0 HSPF2
Midea MDV-H36DVN1-(D)19.2 SEER2 · 9.2 HSPF2

See all 205 36,000 BTU mini-splits, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of May 28, 2026. How we use the data.