What is the SEER2 rating of the Hisense AST-12UW3TXU00?

The Hisense AST-12UW3TXU00 is rated at up to 23.0 SEER2 and 12.3 EER2 for cooling and up to 9.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.

Is the Hisense AST-12UW3TXU00 good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 10,600 BTU/h at 5°F with a COP of 2.00, so it is still 2.0 times as efficient as electric resistance heat at that temperature.

How much does the Hisense AST-12UW3TXU00 cost to run per year?

At its rated efficiency it costs about $247-$771 a year in electricity in large U.S. cities, depending on climate and local rates - for example $320 in Phoenix and $656 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 Hisense AST-12UW3TXU00?

ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses HISENSE AST-12UW3TXU**00.

12,000 BTU mini-split heat pump · HiULTRA

Hisense AST-12UW3TXU00

Average cooling efficiency and below average heating efficiency for a 12,000 BTU mini-split heat pump, and certified for cold climates.

Ranks #264 of 394 12,000 BTU mini-splits for cooling efficiency, and costs about $312 a year to run in a mixed climate like Atlanta.

SEER2: 23.0 Cooling efficiency over a season
Average · beats 62%
HSPF2: 9.5 Heating efficiency over a season
Below average · beats 24%
EER2: 12.3 Cooling efficiency on a 95°F day
Below average · beats 34%
Heat at 5°F: 10,600 BTU/h88% of its 47°F output
Average · beats 48%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 10,600 BTU/h at 5°F.
You want steady temperatures and quiet running - the compressor varies its speed.

Think twice if…

You mainly need heat - its HSPF2 is below average for mini-splits.

Calculate my running cost

Details

Specifications12,000 BTU, R-454B

General
Brand	Hisense
Outdoor unit model	AST-12UW3TXU00
Series	HiULTRA
Type	Mini-split heat pump
Nominal size	12,000 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	March 27, 2026
Cooling
SEER2Seasonal efficiency, higher is better	23.0 (range 23.0)
EER2Efficiency at 95°F outdoors	12.3
Cooling capacity	12,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	9.5
Capacity at 47°F	12,000 BTU/h
Capacity at 17°F	10,800 BTU/h
Capacity at 5°F	10,600 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.00
ENERGY STAR cold climate	Yes

Heating output as it gets colder88% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with AST-12UW3TXU**00 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.
AST-12UW3TXU**00 HISENSE · cold climate	23.0	12.3	9.5	10,600	216019254

Yearly running cost in 10 large cities$247-$771

Phoenix, AZ$320/yr
Miami, FL$247/yr
Houston, TX$287/yr
Atlanta, GA$312/yr
Los Angeles, CA$308/yr
New York, NY$771/yr
Chicago, IL$631/yr
Denver, CO$528/yr
Seattle, WA$328/yr
Minneapolis, MN$656/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 Hisense AST-12UW3TXU00?: The Hisense AST-12UW3TXU00 is rated at up to 23.0 SEER2 and 12.3 EER2 for cooling and up to 9.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
Is the Hisense AST-12UW3TXU00 good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 10,600 BTU/h at 5°F with a COP of 2.00, so it is still 2.0 times as efficient as electric resistance heat at that temperature.
How much does the Hisense AST-12UW3TXU00 cost to run per year?: At its rated efficiency it costs about $247-$771 a year in electricity in large U.S. cities, depending on climate and local rates - for example $320 in Phoenix and $656 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 Hisense AST-12UW3TXU00?: ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses HISENSE AST-12UW3TXU**00.
What refrigerant does the Hisense AST-12UW3TXU00 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 $325/yrYou save $294/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 AST-12UW3TXU00

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: $325
Current system, per year: $619
You save per year: $294
Payback: 15.3 years
Net after 10 years: -$1,564

Cooling $184Heating $141Electricity used: 2,032 kWhSaved vs. a minimum-efficiency heat pump: $149

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 12,000 BTU models

TCL TSC-12HA2/I3TI23 · cold climate23.0 SEER2 · 9.5 HSPF2
TCL TSH12HDI1NAN0T2323.0 SEER2 · 9.5 HSPF2
GREE GWH12AUCXD-D6DNA1E/O · cold climate23.0 SEER2 · 9.5 HSPF2
Fujitsu AOU12RLFF · cold climate22.7 SEER2 · 11.2 HSPF2
Ameristar M3THS2212A91NA23.0 SEER2 · 9.5 HSPF2
Fujitsu AOU12RLFFH · cold climate22.7 SEER2 · 11.0 HSPF2
TCL TH12SVH23BWC · cold climate23.0 SEER2 · 9.8 HSPF2
AI AIR CONDITIONING AO24-12N1-B1H22.7 SEER2 · 10.4 HSPF2

See all 394 12,000 BTU mini-splits, ranked

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