What is the SEER2 rating of the AI AIR CONDITIONING AO21-30N2-M1?

The AI AIR CONDITIONING AO21-30N2-M1 is rated at up to 22.3 SEER2 and 12.0 EER2 for cooling and up to 9.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 2 certified matchups SEER2 ranges from 17.0-22.3.

Is the AI AIR CONDITIONING AO21-30N2-M1 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 AI AIR CONDITIONING AO21-30N2-M1 cost to run per year?

At its rated efficiency it costs about $637-$2,026 a year in electricity in large U.S. cities, depending on climate and local rates - for example $830 in Phoenix and $1,727 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the AI AIR CONDITIONING AO21-30N2-M1 the same as the ComfortStar CPP3-30CD(O)?

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 AI AIR CONDITIONING AO21-30N2-M1?

ENERGY STAR lists 2 certified combinations for this outdoor unit. The highest-rated ones use AW21-30N2-M1, AAH-30N2-CM1.

30,000 BTU mini-split heat pump · AO Series

AI AIR CONDITIONING AO21-30N2-M1

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

Ranks #65 of 171 30,000 BTU mini-splits for cooling efficiency, and costs about $816 a year to run in a mixed climate like Atlanta.

SEER2: 22.3 Cooling efficiency over a season
Average · beats 53%
HSPF2: 9.0 Heating efficiency over a season
Below average · beats 10%
EER2: 12.0 Cooling efficiency on a 95°F day
Below average · beats 25%
Heat at 5°F: 20,400 BTU/h67% of its 47°F output
Average · beats 67%

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.

Calculate my running cost

Details

Specifications30,000 BTU, R-454B

General
Brand	AI AIR CONDITIONING
Also sold as	ComfortStar
Outdoor unit model	AO21-30N2-M1
Series	AO Series
Type	Mini-split heat pump
Nominal size	30,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	October 10, 2024
Last certified	November 24, 2025
Cooling
SEER2Seasonal efficiency, higher is better	22.3 (range 17.0-22.3)
EER2Efficiency at 95°F outdoors	11.0-12.0
Cooling capacity	30,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	8.7-9.0
Capacity at 47°F	30,000 BTU/h
Capacity at 17°F	19,400-20,000 BTU/h
Capacity at 5°F	20,000-20,400 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.94-2.10
ENERGY STAR cold climate	No

Heating output as it gets colder67% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with AW21-30N2-M1 at the standard test temperatures, in BTU/h:

Certified matchups2 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.
AW21-30N2-M1	22.3	12.0	9.0	20,000	215866726
AAH-30N2-CM1	17.0	11.0	8.7	20,400	217162306

Same unit, other model numbers1

These model numbers have exactly the same certified ratings and matchups as the AI AIR CONDITIONING AO21-30N2-M1: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

ComfortStar CPP3-30CD(O)

Yearly running cost in 10 large cities$637-$2,026

Phoenix, AZ$830/yr
Miami, FL$637/yr
Houston, TX$746/yr
Atlanta, GA$816/yr
Los Angeles, CA$808/yr
New York, NY$2,026/yr
Chicago, IL$1,659/yr
Denver, CO$1,391/yr
Seattle, WA$864/yr
Minneapolis, MN$1,727/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 AI AIR CONDITIONING AO21-30N2-M1?: The AI AIR CONDITIONING AO21-30N2-M1 is rated at up to 22.3 SEER2 and 12.0 EER2 for cooling and up to 9.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 2 certified matchups SEER2 ranges from 17.0-22.3.
Is the AI AIR CONDITIONING AO21-30N2-M1 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 AI AIR CONDITIONING AO21-30N2-M1 cost to run per year?: At its rated efficiency it costs about $637-$2,026 a year in electricity in large U.S. cities, depending on climate and local rates - for example $830 in Phoenix and $1,727 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the AI AIR CONDITIONING AO21-30N2-M1 the same as the ComfortStar CPP3-30CD(O)?: 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 AI AIR CONDITIONING AO21-30N2-M1?: ENERGY STAR lists 2 certified combinations for this outdoor unit. The highest-rated ones use AW21-30N2-M1, AAH-30N2-CM1.
What refrigerant does the AI AIR CONDITIONING AO21-30N2-M1 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 $847/yrYou save $700/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 AI AIR CONDITIONING AO21-30N2-M1

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: $847
Current system, per year: $1,547
You save per year: $700
Payback: 16.4 years
Net after 10 years: -$4,500

Cooling $474Heating $373Electricity used: 5,293 kWhSaved vs. a minimum-efficiency heat pump: $340

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

Midea MO1BS-H30B-2A22.3 SEER2 · 9.5 HSPF2
AproDr AAG22-30H1B22.3 SEER2 · 9.0 HSPF2
Cooper&Hunter CH-REL30-230VO22.3 SEER2 · 9.5 HSPF2
Blueridge BMS3022YC22.3 SEER2 · 9.0 HSPF2
Carrier 37MHRAQ30AA322.4 SEER2 · 9.0 HSPF2
Elios ESHBA30C2AN · cold climate22.3 SEER2 · 9.0 HSPF2
Arcoaire D5CERAH30AAK22.4 SEER2 · 9.0 HSPF2
Fujitsu AOUH30LUAH1 · cold climate22.0 SEER2 · 11.0 HSPF2

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

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of November 24, 2025. How we use the data.