What is the SEER2 rating of the AUX ASUM18HPMULO?

The AUX ASUM18HPMULO is rated at up to 23.3 SEER2 and 12.5 EER2 for cooling and up to 11.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 3 certified matchups SEER2 ranges from 20.5-23.3.

Is the AUX ASUM18HPMULO good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 21,800 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 AUX ASUM18HPMULO cost to run per year?

At its rated efficiency it costs about $364-$1,022 a year in electricity in large U.S. cities, depending on climate and local rates - for example $455 in Phoenix and $859 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the AUX ASUM18HPMULO the same as the ACIQ ACIQ-18Z-E-HH-M2?

Yes, as far as the certified ratings go. ENERGY STAR lists 3 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.

18,000 BTU mini-split heat pump · C-Series

AUX ASUM18HPMULO

Average cooling efficiency and very good heating efficiency for a 18,000 BTU mini-split heat pump, and certified for cold climates.

Ranks #134 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $423 a year to run in a mixed climate like Atlanta.

SEER2: 23.3 Cooling efficiency over a season
Average · beats 67%
HSPF2: 11.0 Heating efficiency over a season
Very good · beats 75%
EER2: 12.5 Cooling efficiency on a 95°F day
Average · beats 44%
Heat at 5°F: 21,800 BTU/h121% 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 21,800 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

Specifications18,000 BTU, R-32

General
Brand	AUX
Also sold as	ACIQ, Armbridge
Outdoor unit model	ASUM18HPMULO
Series	C-Series
Type	Mini-split heat pump
Nominal size	18,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-32
Connected (smart) capable	No
On the market since	May 30, 2024
Last certified	August 11, 2026
Cooling
SEER2Seasonal efficiency, higher is better	23.3 (range 20.5-23.3)
EER2Efficiency at 95°F outdoors	12.3-12.5
Cooling capacity	18,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	9.8-11.0
Capacity at 47°F	18,000 BTU/h
Capacity at 17°F	19,000-22,000 BTU/h
Capacity at 5°F	19,000-21,800 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 colder121% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its best matchup 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.
- · cold climate	23.3	12.5	11.0	21,800	214291428
- · cold climate	21.9	12.4	10.4	20,400	216050939
- · cold climate	20.5	12.3	9.8	19,000	216032437

Same unit, other model numbers2

These model numbers have exactly the same certified ratings and matchups as the AUX ASUM18HPMULO: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

ACIQ ACIQ-18Z-E-HH-M2
Armbridge AB-GTMH18-230VO

Yearly running cost in 10 large cities$364-$1,022

Phoenix, AZ$455/yr
Miami, FL$364/yr
Houston, TX$408/yr
Atlanta, GA$423/yr
Los Angeles, CA$413/yr
New York, NY$1,022/yr
Chicago, IL$832/yr
Denver, CO$693/yr
Seattle, WA$427/yr
Minneapolis, MN$859/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 AUX ASUM18HPMULO?: The AUX ASUM18HPMULO is rated at up to 23.3 SEER2 and 12.5 EER2 for cooling and up to 11.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 3 certified matchups SEER2 ranges from 20.5-23.3.
Is the AUX ASUM18HPMULO good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 21,800 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 AUX ASUM18HPMULO cost to run per year?: At its rated efficiency it costs about $364-$1,022 a year in electricity in large U.S. cities, depending on climate and local rates - for example $455 in Phoenix and $859 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the AUX ASUM18HPMULO the same as the ACIQ ACIQ-18Z-E-HH-M2?: Yes, as far as the certified ratings go. ENERGY STAR lists 3 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.
What refrigerant does the AUX ASUM18HPMULO use?: It uses 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 $455/yrYou save $473/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 AUX ASUM18HPMULO

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: $455
Current system, per year: $928
You save per year: $473
Payback: 14.8 years
Net after 10 years: -$2,271

Cooling $272Heating $183Electricity used: 2,845 kWhSaved vs. a minimum-efficiency heat pump: $257

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

GE Appliances ASH118URDE · cold climate23.0 SEER2 · 12.0 HSPF2
WABBAN BB18HXP2A1DO23.5 SEER2 · 9.0 HSPF2
GE Appliances ASH118URDSE23.0 SEER2 · 11.0 HSPF2
TOSOT TWH24AUC25R32A1DO · cold climate23.5 SEER2 · 9.0 HSPF2
ComfortStar CZP18CD(O)23.0 SEER2 · 10.7 HSPF2
BOREAL KULA18HPJ1OB · cold climate23.5 SEER2 · 9.0 HSPF2
Pioneer YN018GMFI22RPE · cold climate23.0 SEER2 · 10.7 HSPF2
ZERO ZMSB-18HVT-USHHCR2 · cold climate23.5 SEER2 · 10.0 HSPF2

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

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of August 11, 2026. How we use the data.