What is the SEER2 rating of the Hisense AUW-18U3TJ1?

The Hisense AUW-18U3TJ1 is rated at up to 21.0 SEER2 and 12.0 EER2 for cooling and up to 10.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 5 certified matchups SEER2 ranges from 19.0-21.0.

Is the Hisense AUW-18U3TJ1 good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 18,000 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 AUW-18U3TJ1 cost to run per year?

At its rated efficiency it costs about $404-$1,125 a year in electricity in large U.S. cities, depending on climate and local rates - for example $504 in Phoenix and $945 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the Hisense AUW-18U3TJ1 the same as the Hisense AOU-18U3T25U?

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 AUW-18U3TJ1?

ENERGY STAR lists 5 certified combinations for this outdoor unit. The highest-rated ones use HISENSE AST-18UW3TBBDN00A, HISENSE ACT-18UR3TJA1, HISENSE AST-18UW3TBW**00.

18,000 BTU mini-split heat pump · Hi UNI

Hisense AUW-18U3TJ1

Below average cooling efficiency and average heating efficiency for a 18,000 BTU mini-split heat pump, and certified for cold climates.

Ranks #336 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $466 a year to run in a mixed climate like Atlanta.

SEER2: 21.0 Cooling efficiency over a season
Below average · beats 30%
HSPF2: 10.0 Heating efficiency over a season
Average · beats 43%
EER2: 12.0 Cooling efficiency on a 95°F day
Below average · beats 25%
Heat at 5°F: 18,000 BTU/h100% 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 18,000 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.

Calculate my running cost

Details

Specifications18,000 BTU, R-454B

General
Brand	Hisense
Outdoor unit model	AUW-18U3TJ1
Series	Hi UNI
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	September 25, 2024
Last certified	March 9, 2026
Cooling
SEER2Seasonal efficiency, higher is better	21.0 (range 19.0-21.0)
EER2Efficiency at 95°F outdoors	11.7-12.0
Cooling capacity	18,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	9.0-10.0
Capacity at 47°F	18,000 BTU/h
Capacity at 17°F	13,200-14,100 BTU/h
Capacity at 5°F	18,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.80-2.00
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 AST-18UW3TBBDN00A at the standard test temperatures, in BTU/h:

Certified matchups5 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-18UW3TBBDN00A HISENSE · cold climate	21.0	12.0	10.0	18,000	215743599
ACT-18UR3TJA1 HISENSE · cold climate	20.0	12.0	10.0	18,000	216019252
AST-18UW3TBW**00 HISENSE · cold climate	19.5	11.7	9.5	18,000	217231611
AST-18UW3TBN**00 HISENSE · cold climate	19.5	11.7	9.5	18,000	217231619
ADT-18UX3TGM1 HISENSE · cold climate	19.0	11.7	9.0	18,000	216441724

Same unit, other model numbers1

These model numbers have exactly the same certified ratings and matchups as the Hisense AUW-18U3TJ1: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

Hisense AOU-18U3T25U

Yearly running cost in 10 large cities$404-$1,125

Phoenix, AZ$504/yr
Miami, FL$404/yr
Houston, TX$452/yr
Atlanta, GA$466/yr
Los Angeles, CA$456/yr
New York, NY$1,125/yr
Chicago, IL$916/yr
Denver, CO$763/yr
Seattle, WA$470/yr
Minneapolis, MN$945/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 AUW-18U3TJ1?: The Hisense AUW-18U3TJ1 is rated at up to 21.0 SEER2 and 12.0 EER2 for cooling and up to 10.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 5 certified matchups SEER2 ranges from 19.0-21.0.
Is the Hisense AUW-18U3TJ1 good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 18,000 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 AUW-18U3TJ1 cost to run per year?: At its rated efficiency it costs about $404-$1,125 a year in electricity in large U.S. cities, depending on climate and local rates - for example $504 in Phoenix and $945 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the Hisense AUW-18U3TJ1 the same as the Hisense AOU-18U3T25U?: 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 AUW-18U3TJ1?: ENERGY STAR lists 5 certified combinations for this outdoor unit. The highest-rated ones use HISENSE AST-18UW3TBBDN00A, HISENSE ACT-18UR3TJA1, HISENSE AST-18UW3TBW**00.
What refrigerant does the Hisense AUW-18U3TJ1 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 $503/yrYou save $425/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 AUW-18U3TJ1

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: $503
Current system, per year: $928
You save per year: $425
Payback: 16.5 years
Net after 10 years: -$2,752

Cooling $302Heating $202Electricity used: 3,146 kWhSaved vs. a minimum-efficiency heat pump: $209

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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Guardian URC18CN23STG1 · cold climate21.0 SEER2 · 10.0 HSPF2
TOSOT TM18D6MO · cold climate21.0 SEER2 · 10.0 HSPF2
Guardian UPC18CN23STG1 · cold climate21.0 SEER2 · 10.0 HSPF2
TOSOT TM18H32MO · cold climate21.0 SEER2 · 10.0 HSPF2
Gibson GXH18(5.3)FMK4DH-1 · cold climate21.0 SEER2 · 10.0 HSPF2
TOSOT TMH18D32PO · cold climate21.0 SEER2 · 10.0 HSPF2
GE Appliances ASH218JCDD21.0 SEER2 · 10.0 HSPF2

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

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of March 9, 2026. How we use the data.