What is the SEER2 rating of the ACIQ UB1MSHQCO18?

The ACIQ UB1MSHQCO18 is rated at up to 22.5 SEER2 and 13.0 EER2 for cooling and up to 8.6 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.

Is the ACIQ UB1MSHQCO18 good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 12,700 BTU/h at 5°F with a COP of 1.80, so it is still 1.8 times as efficient as electric resistance heat at that temperature.

How much does the ACIQ UB1MSHQCO18 cost to run per year?

At its rated efficiency it costs about $380-$1,261 a year in electricity in large U.S. cities, depending on climate and local rates - for example $502 in Phoenix and $1,080 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 ACIQ UB1MSHQCO18?

ENERGY STAR lists 4 certified combinations for this outdoor unit. The highest-rated ones use ACiQ UB1MSHQCW18, Buck Cool UB1MSHQCW18, Perfect Aire UB1MSHQCW18.

What refrigerant does the ACIQ UB1MSHQCO18 use?

It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and R-32.

18,000 BTU mini-split heat pump · Hi MULTI Xtreme

ACIQ UB1MSHQCO18

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

Ranks #185 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $504 a year to run in a mixed climate like Atlanta.

SEER2: 22.5 Cooling efficiency over a season
Average · beats 56%
HSPF2: 8.6 Heating efficiency over a season
Below average · beats 5%
EER2: 13.0 Cooling efficiency on a 95°F day
Average · beats 62%
Heat at 5°F: 12,700 BTU/h71% of its 47°F output
Below average · beats 9%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 12,700 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.
You want the newest refrigerant - it uses R-410A, which is being phased down.

Calculate my running cost

Details

Specifications18,000 BTU, R-410A

General
Brand	ACIQ
Also sold as	Buck Cool, PerfectAire, ProAire
Outdoor unit model	UB1MSHQCO18
Series	Hi MULTI Xtreme
Type	Mini-split heat pump
Nominal size	18,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	May 20, 2022
Last certified	June 9, 2026
Cooling
SEER2Seasonal efficiency, higher is better	22.5 (range 22.5)
EER2Efficiency at 95°F outdoors	13.0
Cooling capacity	18,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	8.6
Capacity at 47°F	18,000 BTU/h
Capacity at 17°F	10,000 BTU/h
Capacity at 5°F	12,700 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.80
ENERGY STAR cold climate	Yes

Heating output as it gets colder71% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with UB1MSHQCW18 at the standard test temperatures, in BTU/h:

Certified matchups4 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.
UB1MSHQCW18 ACiQ · cold climate	22.5	13.0	8.6	12,700	208287567
UB1MSHQCW18 Buck Cool · cold climate	22.5	13.0	8.6	12,700	208287574
UB1MSHQCW18 Perfect Aire · cold climate	22.5	13.0	8.6	12,700	208287583
UB1MSHQCW18 ProAire · cold climate	22.5	13.0	8.6	12,700	208287593

Yearly running cost in 10 large cities$380-$1,261

Phoenix, AZ$502/yr
Miami, FL$380/yr
Houston, TX$451/yr
Atlanta, GA$504/yr
Los Angeles, CA$501/yr
New York, NY$1,261/yr
Chicago, IL$1,035/yr
Denver, CO$870/yr
Seattle, WA$541/yr
Minneapolis, MN$1,080/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 ACIQ UB1MSHQCO18?: The ACIQ UB1MSHQCO18 is rated at up to 22.5 SEER2 and 13.0 EER2 for cooling and up to 8.6 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
Is the ACIQ UB1MSHQCO18 good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 12,700 BTU/h at 5°F with a COP of 1.80, so it is still 1.8 times as efficient as electric resistance heat at that temperature.
How much does the ACIQ UB1MSHQCO18 cost to run per year?: At its rated efficiency it costs about $380-$1,261 a year in electricity in large U.S. cities, depending on climate and local rates - for example $502 in Phoenix and $1,080 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 ACIQ UB1MSHQCO18?: ENERGY STAR lists 4 certified combinations for this outdoor unit. The highest-rated ones use ACiQ UB1MSHQCW18, Buck Cool UB1MSHQCW18, Perfect Aire UB1MSHQCW18.
What refrigerant does the ACIQ UB1MSHQCO18 use?: It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and 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 $516/yrYou save $412/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 ACIQ UB1MSHQCO18

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: $516
Current system, per year: $928
You save per year: $412
Payback: 17.0 years
Net after 10 years: -$2,879

Cooling $282Heating $234Electricity used: 3,225 kWhSaved vs. a minimum-efficiency heat pump: $196

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

Hitachi RAC-SH18WHLAE22.5 SEER2 · 9.2 HSPF2
PerfectAire 3PAMSHQCO18 · cold climate22.5 SEER2 · 8.6 HSPF2
Friedrich FPHSR18A3A · cold climate22.5 SEER2 · 9.2 HSPF2
TGM MRS5VHT18AS · cold climate22.3 SEER2 · 11.4 HSPF2
MDV M2OX330-18HFN8-M1 · cold climate22.5 SEER2 · 9.6 HSPF2
AproDr ALC24-18H1B · cold climate22.2 SEER2 · 12.2 HSPF2
LG KUMXB181A22.5 SEER2 · 9.8 HSPF2
Elios ESHEA18C2AN1 · cold climate22.2 SEER2 · 12.2 HSPF2

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

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