What is the SEER2 rating of the Hisense AO-09U3T25U?

The Hisense AO-09U3T25U is rated at up to 25.0 SEER2 and 13.7 EER2 for cooling and up to 11.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.

Is the Hisense AO-09U3T25U good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 9,000 BTU/h at 5°F with a COP of 2.10, so it is still 2.1 times as efficient as electric resistance heat at that temperature.

How much does the Hisense AO-09U3T25U cost to run per year?

At its rated efficiency it costs about $170-$504 a year in electricity in large U.S. cities, depending on climate and local rates - for example $216 in Phoenix and $427 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the Hisense AO-09U3T25U the same as the Guardian URC09CN23STG1?

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 Hisense AO-09U3T25U?

ENERGY STAR lists 3 certified combinations for this outdoor unit. The highest-rated ones use HISENSE ASU-09U3THB25U, HISENSE ASU-09U3THB25U-B, HISENSE ASU-09U3THB25U-S.

9,000 BTU mini-split heat pump · Hi-ULTRA

Hisense AO-09U3T25U

Very good cooling and heating efficiency for a 9,000 BTU mini-split heat pump, and certified for cold climates.

Ranks #166 of 395 9,000 BTU mini-splits for cooling efficiency, and costs about $206 a year to run in a mixed climate like Atlanta.

SEER2: 25.0 Cooling efficiency over a season
Very good · beats 83%
HSPF2: 11.0 Heating efficiency over a season
Very good · beats 75%
EER2: 13.7 Cooling efficiency on a 95°F day
Very good · beats 77%
Heat at 5°F: 9,000 BTU/h100% of its 47°F output
Average · beats 67%

A good fit if…

You want low cooling bills - its SEER2 beats 83% of mini-splits.
Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 9,000 BTU/h at 5°F.
It will heat most of the year - its HSPF2 beats 75% 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

Specifications9,000 BTU, R-454B

General
Brand	Hisense
Also sold as	Guardian, Coleman, Luxaire
Outdoor unit model	AO-09U3T25U
Series	Hi-ULTRA
Type	Mini-split heat pump
Nominal size	9,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	February 3, 2026
Last certified	June 25, 2026
Cooling
SEER2Seasonal efficiency, higher is better	25.0 (range 25.0)
EER2Efficiency at 95°F outdoors	13.7
Cooling capacity	9,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	11.0
Capacity at 47°F	9,000 BTU/h
Capacity at 17°F	9,000 BTU/h
Capacity at 5°F	9,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.10
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 ASU-09U3THB25U 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.
ASU-09U3THB25U HISENSE · cold climate	25.0	13.7	11.0	9,000	216409116
ASU-09U3THB25U-B HISENSE · cold climate	25.0	13.7	11.0	9,000	217080955
ASU-09U3THB25U-S HISENSE · cold climate	25.0	13.7	11.0	9,000	218621916

Same unit, other model numbers1

These model numbers have exactly the same certified ratings and matchups as the Hisense AO-09U3T25U: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

Guardian URC09CN23STG1

Yearly running cost in 10 large cities$170-$504

Phoenix, AZ$216/yr
Miami, FL$170/yr
Houston, TX$194/yr
Atlanta, GA$206/yr
Los Angeles, CA$203/yr
New York, NY$504/yr
Chicago, IL$412/yr
Denver, CO$344/yr
Seattle, WA$213/yr
Minneapolis, MN$427/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 Hisense AO-09U3T25U?: The Hisense AO-09U3T25U is rated at up to 25.0 SEER2 and 13.7 EER2 for cooling and up to 11.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
Is the Hisense AO-09U3T25U good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 9,000 BTU/h at 5°F with a COP of 2.10, so it is still 2.1 times as efficient as electric resistance heat at that temperature.
How much does the Hisense AO-09U3T25U cost to run per year?: At its rated efficiency it costs about $170-$504 a year in electricity in large U.S. cities, depending on climate and local rates - for example $216 in Phoenix and $427 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the Hisense AO-09U3T25U the same as the Guardian URC09CN23STG1?: 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 Hisense AO-09U3T25U?: ENERGY STAR lists 3 certified combinations for this outdoor unit. The highest-rated ones use HISENSE ASU-09U3THB25U, HISENSE ASU-09U3THB25U-B, HISENSE ASU-09U3THB25U-S.
What refrigerant does the Hisense AO-09U3T25U 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 $218/yrYou save $246/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 Hisense AO-09U3T25U

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: $218
Current system, per year: $464
You save per year: $246
Payback: 14.2 years
Net after 10 years: -$1,043

Cooling $127Heating $92Electricity used: 1,365 kWhSaved vs. a minimum-efficiency heat pump: $138

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 9,000 BTU models

Friedrich FPHSR09A3D · cold climate25.0 SEER2 · 11.0 HSPF2
Friedrich FPHSR09A3B · cold climate25.0 SEER2 · 11.0 HSPF2
MDV MOX230-09HFN1-BW0Q1W25.0 SEER2 · 10.8 HSPF2
Goodman MSH093E23MCAA · cold climate25.0 SEER2 · 12.0 HSPF2
ApooDr ASG24-09H1B · cold climate25.0 SEER2 · 10.7 HSPF2
Elios DEA09HOS28230E8 · cold climate25.0 SEER2 · 12.0 HSPF2
AUX AMAR09HP115V1CO · cold climate25.0 SEER2 · 10.5 HSPF2
Midea MO1ES-H09B-1A · cold climate25.4 SEER2 · 10.0 HSPF2

See all 395 9,000 BTU mini-splits, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of June 25, 2026. How we use the data.