What is the SEER2 rating of the Armstrong Air 4DHV2S09S-1L?

The Armstrong Air 4DHV2S09S-1L is rated at up to 21.5 SEER2 and 12.5 EER2 for cooling and up to 9.1 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.

Is the Armstrong Air 4DHV2S09S-1L good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 7,000 BTU/h at 5°F with a COP of 2.16, so it is still 2.2 times as efficient as electric resistance heat at that temperature.

How much does the Armstrong Air 4DHV2S09S-1L cost to run per year?

At its rated efficiency it costs about $199-$662 a year in electricity in large U.S. cities, depending on climate and local rates - for example $263 in Phoenix and $567 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 Armstrong Air 4DHV2S09S-1L?

ENERGY STAR lists 13 certified combinations for this outdoor unit. The highest-rated ones use DWH209S4-*L, Allied DWH209S4-*L, DWH209S4-1L.

What refrigerant does the Armstrong Air 4DHV2S09S-1L 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.

9,000 BTU mini-split heat pump · 4DH SERIES

Armstrong Air 4DHV2S09S-1L

Below average cooling and heating efficiency for a 9,000 BTU mini-split heat pump, and certified for cold climates.

Ranks #292 of 395 9,000 BTU mini-splits for cooling efficiency, and costs about $264 a year to run in a mixed climate like Atlanta.

SEER2: 21.5 Cooling efficiency over a season
Below average · beats 39%
HSPF2: 9.1 Heating efficiency over a season
Below average · beats 13%
EER2: 12.5 Cooling efficiency on a 95°F day
Average · beats 44%
Heat at 5°F: 7,000 BTU/h70% of its 47°F output
Very good · beats 74%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 7,000 BTU/h at 5°F.
You want steady temperatures and quiet running - the compressor varies its speed.
You want a choice of indoor units - 13 certified pairings.

Think twice if…

Cooling cost matters most - its SEER2 is below average for mini-splits.
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

Specifications9,000 BTU, R-410A

General
Brand	Armstrong Air
Also sold as	ALLIED, Ducane, Concord, AIREASE
Outdoor unit model	4DHV2S09S-1L
Series	4DH SERIES
Type	Mini-split heat pump
Nominal size	9,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	January 1, 2022
Last certified	May 12, 2026
Cooling
SEER2Seasonal efficiency, higher is better	21.5 (range 21.5)
EER2Efficiency at 95°F outdoors	12.5
Cooling capacity	9,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	9.1
Capacity at 47°F	10,000 BTU/h
Capacity at 17°F	6,300 BTU/h
Capacity at 5°F	7,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.16
ENERGY STAR cold climate	Yes

Heating output as it gets colder70% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with DWH209S4-*L at the standard test temperatures, in BTU/h:

Certified matchups13 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.
DWH209S4-*L · cold climate	21.5	12.5	9.1	7,000	211034539
DWH209S4-*L Allied · cold climate	21.5	12.5	9.1	7,000	211034513
DWH209S4-1L · cold climate	21.5	12.5	9.1	7,000	208106740
DWH209S4-1L CONCORD · cold climate	21.5	12.5	9.1	7,000	208106751
DWH209S4-1L Allied · cold climate	21.5	12.5	9.1	7,000	208106707
DWH209S4-1L · cold climate	21.5	12.5	9.1	7,000	208106740
DWH209S4-1L AirEase · cold climate	21.5	12.5	9.1	7,000	208106729
DWH209S4-1L DUCANE · cold climate	21.5	12.5	9.1	7,000	208106718
DWH209S4-1L Allied · cold climate	21.5	12.5	9.1	7,000	208106707
DWH209S4-*L AirEase · cold climate	21.5	12.5	9.1	7,000	211034487
DWH209S4-*L CONCORD · cold climate	21.5	12.5	9.1	7,000	211034565
DWH209S4-*L DUCANE · cold climate	21.5	12.5	9.1	7,000	211034591
DWH209S4-1L DUCANE · cold climate	21.5	12.5	9.1	7,000	208106718

Yearly running cost in 10 large cities$199-$662

Phoenix, AZ$263/yr
Miami, FL$199/yr
Houston, TX$237/yr
Atlanta, GA$264/yr
Los Angeles, CA$263/yr
New York, NY$662/yr
Chicago, IL$543/yr
Denver, CO$456/yr
Seattle, WA$284/yr
Minneapolis, MN$567/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 Armstrong Air 4DHV2S09S-1L?: The Armstrong Air 4DHV2S09S-1L is rated at up to 21.5 SEER2 and 12.5 EER2 for cooling and up to 9.1 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
Is the Armstrong Air 4DHV2S09S-1L good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 7,000 BTU/h at 5°F with a COP of 2.16, so it is still 2.2 times as efficient as electric resistance heat at that temperature.
How much does the Armstrong Air 4DHV2S09S-1L cost to run per year?: At its rated efficiency it costs about $199-$662 a year in electricity in large U.S. cities, depending on climate and local rates - for example $263 in Phoenix and $567 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 Armstrong Air 4DHV2S09S-1L?: ENERGY STAR lists 13 certified combinations for this outdoor unit. The highest-rated ones use DWH209S4-*L, Allied DWH209S4-*L, DWH209S4-1L.
What refrigerant does the Armstrong Air 4DHV2S09S-1L 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 $270/yrYou save $210/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 Armstrong Air 4DHV2S09S-1L

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: $270
Current system, per year: $480
You save per year: $210
Payback: 16.7 years
Net after 10 years: -$1,400

Cooling $147Heating $123Electricity used: 1,690 kWhSaved vs. a minimum-efficiency heat pump: $100

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 9,000 BTU models

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MDV MOX230-09HFN1-MT0W-L · cold climate21.5 SEER2 · 9.4 HSPF2
Cooper&Hunter CH-NY09MIA-115VO · cold climate21.5 SEER2 · 9.1 HSPF2
Midea MO1BS-H09B-2A · cold climate21.6 SEER2 · 9.4 HSPF2
Kepler ODUMOX230-09HFN1-BS5W · cold climate21.5 SEER2 · 9.1 HSPF2
CanAir 4C22SCH09H21 · cold climate21.6 SEER2 · 9.4 HSPF2
Lennox MHB009S4S-1L · cold climate21.5 SEER2 · 9.1 HSPF2

See all 395 9,000 BTU mini-splits, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of May 12, 2026. How we use the data.