What is the SEER2 rating of the Concord 4DHP2S18S-1P?

The Concord 4DHP2S18S-1P is rated at up to 23.5 SEER2 and 12.4 EER2 for cooling and up to 10.7 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 43 certified matchups SEER2 ranges from 20.0-23.5.

Is the Concord 4DHP2S18S-1P good for cold climates?

It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 18,000 BTU model.

How much does the Concord 4DHP2S18S-1P cost to run per year?

At its rated efficiency it costs about $343-$1,081 a year in electricity in large U.S. cities, depending on climate and local rates - for example $445 in Phoenix and $921 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 Concord 4DHP2S18S-1P?

ENERGY STAR lists 43 certified combinations for this outdoor unit. The highest-rated ones use CONCORD DWM218S4-*P, Armstrong Air DWM218S4-*P, Allied DWM218S4-*P.

What refrigerant does the Concord 4DHP2S18S-1P 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 · 4DH SERIES

Concord 4DHP2S18S-1P

Very good cooling efficiency and average heating efficiency for a 18,000 BTU mini-split heat pump, but not rated for cold climates.

Ranks #122 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $436 a year to run in a mixed climate like Atlanta.

SEER2: 23.5 Cooling efficiency over a season
Very good · beats 70%
HSPF2: 10.7 Heating efficiency over a season
Average · beats 68%
EER2: 12.4 Cooling efficiency on a 95°F day
Below average · beats 36%
Heat at 5°F: 13,000 BTU/h59% of its 47°F output
Excellent · beats 93%

A good fit if…

You want low cooling bills - its SEER2 beats 70% of mini-splits.
You want steady temperatures and quiet running - the compressor varies its speed.
You want a choice of indoor units - 43 certified pairings.

Think twice if…

You often see nights below 0°F - it is not cold-climate certified.
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	Concord
Also sold as	Armstrong Air, ALLIED, Ducane, AIREASE
Outdoor unit model	4DHP2S18S-1P
Series	4DH SERIES
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	January 1, 2022
Last certified	May 12, 2026
Cooling
SEER2Seasonal efficiency, higher is better	23.5 (range 20.0-23.5)
EER2Efficiency at 95°F outdoors	12.3-12.5
Cooling capacity	16,000-18,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	10.4-10.7
Capacity at 47°F	19,000-20,000 BTU/h
Capacity at 17°F	12,000-14,900 BTU/h
Capacity at 5°F	11,300-13,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.02-2.40
ENERGY STAR cold climate	No

Heating output as it gets colder59% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with DWM218S4-*P at the standard test temperatures, in BTU/h:

Certified matchups43 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.
DWM218S4-*P CONCORD	23.5	12.4	10.7	11,300	211034548
DWM218S4-*P Armstrong Air	23.5	12.4	10.7	11,300	211034522
DWM218S4-*P Allied	23.5	12.4	10.7	11,300	211034496
DWM218S4-*P AirEase	23.5	12.4	10.7	11,300	211034470
DWM218S4-1P CONCORD	23.5	12.4	10.7	11,300	208106691
DWM218S4-1P CONCORD	23.5	12.4	10.7	11,300	208106691
DWM218S4-1P Armstrong Air	23.5	12.4	10.7	11,300	208106673
DWM218S4-1P Armstrong Air	23.5	12.4	10.7	11,300	208106673
DWM218S4-1P AirEase	23.5	12.4	10.7	11,300	208106682
DWM218S4-1P DUCANE	23.5	12.4	10.7	11,300	208106664
DWM218S4-1P Allied	23.5	12.4	10.7	11,300	208106654
DWM218S4-*P DUCANE	23.5	12.4	10.7	11,300	211034574
DWM218S4-1P AirEase	23.5	12.4	10.7	11,300	208106682
DWM218S4-1P DUCANE	23.5	12.4	10.7	11,300	208106664
DWM218S4-1P Allied	23.5	12.4	10.7	11,300	208106654
D22C118S4-*P Armstrong Air	20.5	12.5	10.4	12,700	211034535
D22C118S4-*P Allied	20.5	12.5	10.4	12,700	211034509
D22C118S4-*P AirEase	20.5	12.5	10.4	12,700	211034483
D22C118S4-1P CONCORD	20.5	12.5	10.4	12,700	208106694
D22C118S4-1P CONCORD	20.5	12.5	10.4	12,700	208106694
D22C118S4-1P Armstrong Air	20.5	12.5	10.4	12,700	208106676
D22C118S4-1P Armstrong Air	20.5	12.5	10.4	12,700	208106676
D22C118S4-1P DUCANE	20.5	12.5	10.4	12,700	208106667
D22C118S4-1P AirEase	20.5	12.5	10.4	12,700	208106685
D22C118S4-*P DUCANE	20.5	12.5	10.4	12,700	211034587
D22C118S4-1P DUCANE	20.5	12.5	10.4	12,700	208106667
D22C118S4-1P Allied	20.5	12.5	10.4	12,700	208106658
D22C118S4-*P CONCORD	20.5	12.5	10.4	12,700	211034561
D22C118S4-1P Allied	20.5	12.5	10.4	12,700	208106658
DMD218S4-*P Armstrong Air	20.0	12.3	10.5	13,000	211034529
DMD218S4-*P CONCORD	20.0	12.3	10.5	13,000	211034555
DMD218S4-*P AirEase	20.0	12.3	10.5	13,000	211034477
DMD218S4-1P CONCORD	20.0	12.3	10.5	13,000	208106697
DMD218S4-1P CONCORD	20.0	12.3	10.5	13,000	208106697
DMD218S4-1P AirEase	20.0	12.3	10.5	13,000	208106688
DMD218S4-1P Armstrong Air	20.0	12.3	10.5	13,000	208106679
DMD218S4-1P Armstrong Air	20.0	12.3	10.5	13,000	208106679
DMD218S4-1P DUCANE	20.0	12.3	10.5	13,000	208106670
DMD218S4-1P DUCANE	20.0	12.3	10.5	13,000	208106670
DMD218S4-1P Allied	20.0	12.3	10.5	13,000	208106661
DMD218S4-1P Allied	20.0	12.3	10.5	13,000	208106661
DMD218S4-*P Allied	20.0	12.3	10.5	13,000	211034503
DMD218S4-*P DUCANE	20.0	12.3	10.5	13,000	211034581

Yearly running cost in 10 large cities$343-$1,081

Phoenix, AZ$445/yr
Miami, FL$343/yr
Houston, TX$400/yr
Atlanta, GA$436/yr
Los Angeles, CA$431/yr
New York, NY$1,081/yr
Chicago, IL$885/yr
Denver, CO$742/yr
Seattle, WA$461/yr
Minneapolis, MN$921/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 Concord 4DHP2S18S-1P?: The Concord 4DHP2S18S-1P is rated at up to 23.5 SEER2 and 12.4 EER2 for cooling and up to 10.7 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 43 certified matchups SEER2 ranges from 20.0-23.5.
Is the Concord 4DHP2S18S-1P good for cold climates?: It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 18,000 BTU model.
How much does the Concord 4DHP2S18S-1P cost to run per year?: At its rated efficiency it costs about $343-$1,081 a year in electricity in large U.S. cities, depending on climate and local rates - for example $445 in Phoenix and $921 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 Concord 4DHP2S18S-1P?: ENERGY STAR lists 43 certified combinations for this outdoor unit. The highest-rated ones use CONCORD DWM218S4-*P, Armstrong Air DWM218S4-*P, Allied DWM218S4-*P.
What refrigerant does the Concord 4DHP2S18S-1P 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 $454/yrYou save $456/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 Concord 4DHP2S18S-1P

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: $454
Current system, per year: $909
You save per year: $456
Payback: 14.3 years
Net after 10 years: -$1,942

Cooling $255Heating $199Electricity used: 2,834 kWhSaved vs. a minimum-efficiency heat pump: $249

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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Midea MOX4-18HFN1AA23.5 SEER2 · 10.8 HSPF2
MDV MOX430-18HFN1-MU0W-L23.5 SEER2 · 10.7 HSPF2
Midea MOX4-18HFN10AE · cold climate23.5 SEER2 · 10.8 HSPF2
Mitsubishi Electric MUZ-FX24NLHZ · cold climate23.5 SEER2 · 10.5 HSPF2
Kaden KO-PSX18HP-2AAMA23.5 SEER2 · 10.8 HSPF2
DELLA 048-TPH-18K2V-23S-OUT · 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 May 12, 2026. How we use the data.