What is the SEER2 rating of the Arcoaire D5CSHAH18AAK?

The Arcoaire D5CSHAH18AAK is rated at up to 21.5 SEER2 and 12.5 EER2 for cooling and up to 12.4 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 97 certified matchups SEER2 ranges from 18.0-21.5.

Is the Arcoaire D5CSHAH18AAK 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 2.20, so it is still 2.2 times as efficient as electric resistance heat at that temperature.

How much does the Arcoaire D5CSHAH18AAK cost to run per year?

At its rated efficiency it costs about $371-$973 a year in electricity in large U.S. cities, depending on climate and local rates - for example $455 in Phoenix and $811 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 Arcoaire D5CSHAH18AAK?

ENERGY STAR lists 97 certified combinations for this outdoor unit. The highest-rated ones use ARCOAIRE D5FSHAH18XAK, COMFORTMAKER D5FSHAH18XAK, DAY & NIGHT D5FSHAH18XAK.

18,000 BTU mini-split heat pump · D5F Series

Arcoaire D5CSHAH18AAK

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

Ranks #256 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $409 a year to run in a mixed climate like Atlanta.

SEER2: 21.5 Cooling efficiency over a season
Below average · beats 39%
HSPF2: 12.4 Heating efficiency over a season
Excellent · beats 93%
EER2: 12.5 Cooling efficiency on a 95°F day
Average · beats 44%
Heat at 5°F: 18,000 BTU/h100% of its 47°F output
Very good · beats 78%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 18,000 BTU/h at 5°F.
It will heat most of the year - its HSPF2 beats 93% of mini-splits.
You want steady temperatures and quiet running - the compressor varies its speed.
You want a choice of indoor units - 97 certified pairings.

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	Arcoaire
Also sold as	Comfortmaker, Day & Night, Smart Comfort, Heil, Keeprite, Kenmore, Midea, Tempstar, Airquest, LPS Legacy, Viessmann, Grandaire
Outdoor unit model	D5CSHAH18AAK
Series	D5F Series
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	November 15, 2018
Last certified	May 6, 2026
Cooling
SEER2Seasonal efficiency, higher is better	21.5 (range 18.0-21.5)
EER2Efficiency at 95°F outdoors	12.0-12.6
Cooling capacity	16,000-18,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	10.1-12.4
Capacity at 47°F	17,000-20,000 BTU/h
Capacity at 17°F	14,000-18,000 BTU/h
Capacity at 5°F	17,000-18,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.86-2.20
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 D5FSHAH18XAK at the standard test temperatures, in BTU/h:

Certified matchups97 indoor units

The same outdoor unit scores differently with each indoor unit. The 60 highest-rated of 97 are shown. 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.
D5FSHAH18XAK ARCOAIRE · cold climate	21.5	12.5	11.0	18,000	215324117
D5FSHAH18XAK COMFORTMAKER · cold climate	21.5	12.5	11.0	18,000	215324190
D5FSHAH18XAK DAY & NIGHT · cold climate	21.5	12.5	11.0	18,000	215324263
D5FSHAH18XAK HEIL · cold climate	21.5	12.5	11.0	18,000	215324336
D5FSHAH18XAK KEEPRITE · cold climate	21.5	12.5	11.0	18,000	215324409
D5FSHAH18XAK KENMORE · cold climate	21.5	12.5	11.0	18,000	215324482
D5FSHAH18XAK MIDEA · cold climate	21.5	12.5	11.0	18,000	215324555
D5FSHAH18XAK TEMPSTAR · cold climate	21.5	12.5	11.0	18,000	215324628
D5FSHAH18XAK SMART COMFORT · cold climate	21.5	12.5	11.0	18,000	215324701
D5FSHAH18XAK AIRQUEST · cold climate	21.5	12.5	11.0	18,000	215324774
D5FSHAH18XAK LPS Legacy · cold climate	21.5	12.5	11.0	18,000	215324847
D5FSHAH18XAK Viessmann · cold climate	21.5	12.5	11.0	18,000	217178795
D5FSOAH18XAK ARCOAIRE · cold climate	20.7	12.5	12.2	17,500	215324118
D5FSOAH18XAK COMFORTMAKER · cold climate	20.7	12.5	12.2	17,500	215324191
D5FSOAH18XAK DAY & NIGHT · cold climate	20.7	12.5	12.2	17,500	215324264
D5FSOAH18XAK SMART COMFORT · cold climate	20.7	12.5	12.2	17,500	215324702
D5FSOAH18XAK HEIL · cold climate	20.7	12.5	12.2	17,500	215324337
D5FSOAH18XAK KEEPRITE · cold climate	20.7	12.5	12.2	17,500	215324410
D5FSOAH18XAK KENMORE · cold climate	20.7	12.5	12.2	17,500	215324483
D5FSOAH18XAK MIDEA · cold climate	20.7	12.5	12.2	17,500	215324556
D5FSOAH18XAK TEMPSTAR · cold climate	20.7	12.5	12.2	17,500	215324629
D5FSOAH18XAK AIRQUEST · cold climate	20.7	12.5	12.2	17,500	215324775
D5FSOAH18XAK LPS Legacy · cold climate	20.7	12.5	12.2	17,500	215324848
D5FSOAH18XAK Viessmann · cold climate	20.7	12.5	12.2	17,500	217178796
D5FCFAH18XAK ARCOAIRE · cold climate	20.5	12.6	10.3	17,000	215324121
D5FCFAH18XAK COMFORTMAKER · cold climate	20.5	12.6	10.3	17,000	215324194
D5FCFAH18XAK DAY & NIGHT · cold climate	20.5	12.6	10.3	17,000	215324267
D5FCFAH18XAK HEIL · cold climate	20.5	12.6	10.3	17,000	215324340
D5FCFAH18XAK SMART COMFORT · cold climate	20.5	12.6	10.3	17,000	215324705
D5FCFAH18XAK KEEPRITE · cold climate	20.5	12.6	10.3	17,000	215324413
D5FCFAH18XAK KENMORE · cold climate	20.5	12.6	10.3	17,000	215324486
D5FCFAH18XAK MIDEA · cold climate	20.5	12.6	10.3	17,000	215324559
D5FCFAH18XAK TEMPSTAR · cold climate	20.5	12.6	10.3	17,000	215324632
D5FCFAH18XAK AIRQUEST · cold climate	20.5	12.6	10.3	17,000	215324778
D5FCFAH18XAK LPS Legacy · cold climate	20.5	12.6	10.3	17,000	215324851
D5FCFAH18XAK Viessmann · cold climate	20.5	12.6	10.3	17,000	217178799
D5FSFAH16XAK ARCOAIRE · cold climate	20.2	12.5	10.3	17,500	215324120
D5FSFAH16XAK COMFORTMAKER · cold climate	20.2	12.5	10.3	17,500	215324193
D5FSFAH16XAK DAY & NIGHT · cold climate	20.2	12.5	10.3	17,500	215324266
D5FSFAH16XAK HEIL · cold climate	20.2	12.5	10.3	17,500	215324339
D5FSFAH16XAK SMART COMFORT · cold climate	20.2	12.5	10.3	17,500	215324704
D5FSFAH16XAK KEEPRITE · cold climate	20.2	12.5	10.3	17,500	215324412
D5FSFAH16XAK KENMORE · cold climate	20.2	12.5	10.3	17,500	215324485
D5FSFAH16XAK MIDEA · cold climate	20.2	12.5	10.3	17,500	215324558
D5FSFAH16XAK TEMPSTAR · cold climate	20.2	12.5	10.3	17,500	215324631
D5FSFAH16XAK AIRQUEST · cold climate	20.2	12.5	10.3	17,500	215324777
D5FSFAH16XAK LPS Legacy · cold climate	20.2	12.5	10.3	17,500	215324850
D5FSFAH16XAK Viessmann · cold climate	20.2	12.5	10.3	17,500	217178798
D5FSCAH18XAK ARCOAIRE · cold climate	20.0	12.5	12.4	17,000	215324119
D5FSCAH18XAK COMFORTMAKER · cold climate	20.0	12.5	12.4	17,000	215324192
D5FSCAH18XAK DAY & NIGHT · cold climate	20.0	12.5	12.4	17,000	215324265
D5FSCAH18XAK SMART COMFORT · cold climate	20.0	12.5	12.4	17,000	215324703
D5FSCAH18XAK HEIL · cold climate	20.0	12.5	12.4	17,000	215324338
D5FSCAH18XAK KEEPRITE · cold climate	20.0	12.5	12.4	17,000	215324411
D5FSCAH18XAK KENMORE · cold climate	20.0	12.5	12.4	17,000	215324484
D5FSCAH18XAK MIDEA · cold climate	20.0	12.5	12.4	17,000	215324557
D5FSCAH18XAK TEMPSTAR · cold climate	20.0	12.5	12.4	17,000	215324630
D5FSCAH18XAK AIRQUEST · cold climate	20.0	12.5	12.4	17,000	215324776
D5FSCAH18XAK LPS Legacy · cold climate	20.0	12.5	12.4	17,000	215324849
D5FSCAH18XAK Viessmann · cold climate	20.0	12.5	12.4	17,000	217178797

Yearly running cost in 10 large cities$371-$973

Phoenix, AZ$455/yr
Miami, FL$371/yr
Houston, TX$408/yr
Atlanta, GA$409/yr
Los Angeles, CA$397/yr
New York, NY$973/yr
Chicago, IL$789/yr
Denver, CO$655/yr
Seattle, WA$402/yr
Minneapolis, MN$811/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 Arcoaire D5CSHAH18AAK?: The Arcoaire D5CSHAH18AAK is rated at up to 21.5 SEER2 and 12.5 EER2 for cooling and up to 12.4 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 97 certified matchups SEER2 ranges from 18.0-21.5.
Is the Arcoaire D5CSHAH18AAK 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 2.20, so it is still 2.2 times as efficient as electric resistance heat at that temperature.
How much does the Arcoaire D5CSHAH18AAK cost to run per year?: At its rated efficiency it costs about $371-$973 a year in electricity in large U.S. cities, depending on climate and local rates - for example $455 in Phoenix and $811 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 Arcoaire D5CSHAH18AAK?: ENERGY STAR lists 97 certified combinations for this outdoor unit. The highest-rated ones use ARCOAIRE D5FSHAH18XAK, COMFORTMAKER D5FSHAH18XAK, DAY & NIGHT D5FSHAH18XAK.
What refrigerant does the Arcoaire D5CSHAH18AAK 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 $450/yrYou save $459/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 Arcoaire D5CSHAH18AAK

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: $450
Current system, per year: $909
You save per year: $459
Payback: 14.2 years
Net after 10 years: -$1,907

Cooling $278Heating $172Electricity used: 2,812 kWhSaved vs. a minimum-efficiency heat pump: $252

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

Lennox MLB018S4M-1P · cold climate21.7 SEER2 · 9.8 HSPF2
Carrier 37MAHAQ18AA3 · cold climate21.5 SEER2 · 12.4 HSPF2
ZERO ZMSB-18HV-USHHCR2-O · cold climate21.7 SEER2 · 10.8 HSPF2
York YRACXJ18WHAA · cold climate21.5 SEER2 · 11.5 HSPF2
Convectair 500004494 · cold climate21.7 SEER2 · 10.8 HSPF2
Blueridge BMY18HH22C · cold climate21.5 SEER2 · 11.3 HSPF2
ComfortStar CHF3-18CD(O) · cold climate21.7 SEER2 · 10.8 HSPF2
Bosch BMS500-AAS018-1CSXHC · cold climate21.5 SEER2 · 11.3 HSPF2

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

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of May 6, 2026. How we use the data.