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      4-ton central heat pump · 4SHP18LX SERIES

      Armstrong Air 4SHP18LX160P

      Average cooling efficiency and below average heating efficiency for a 4-ton central heat pump, but not rated for cold climates.

      Ranks #154 of 319 4 ton central heat pumps for cooling efficiency, and costs about $1,509 a year to run in a mixed climate like Atlanta.

      SEER2
      17.5 Cooling efficiency over a season
      Average · beats 58%
      HSPF2
      7.8 Heating efficiency over a season
      Below average · beats 5%
      EER2
      11.0 Cooling efficiency on a 95°F day
      Below average · beats 23%
      Heat at 5°F
      27,000 BTU/h57% of its 47°F output
      Below average · beats 25%

      A good fit if…

      • You want steady temperatures and quiet running - the compressor varies its speed.
      • You want a choice of indoor units - 36 certified pairings.

      Think twice if…

      • You often see nights below 0°F - it is not cold-climate certified.
      • You mainly need heat - its HSPF2 is below average for central heat pumps.
      • You want the newest refrigerant - it uses R-410A, which is being phased down.

      Calculate my running cost

      Details

      Specifications4 ton, R-410A
      General
      BrandArmstrong Air
      Also sold asAIREASE
      Outdoor unit model4SHP18LX160P
      Series4SHP18LX SERIES
      TypeCentral heat pump
      Nominal size4 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-410A
      Connected (smart) capableNo
      On the market sinceJanuary 1, 2023
      Last certifiedJune 2, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better17.5 (range 16.0-17.5)
      EER2Efficiency at 95°F outdoors11.0-11.5
      Cooling capacity46,000-46,500 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better7.8
      Capacity at 47°F46,000-46,500 BTU/h
      Capacity at 17°F30,600-31,400 BTU/h
      Capacity at 5°F26,200-27,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.80-1.92
      ENERGY STAR cold climateNo
      Heating output as it gets colder57% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with EA(C;U)1P49C+TDR+TXV at the standard test temperatures, in BTU/h:

      Certified matchups36 indoor units

      The same outdoor unit scores differently with each indoor unit and furnace. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      EA(C;U)1P49C+TDR+TXVA98USMV090C1617.511.07.826,600212539013
      EA(C;U)1P49C+TDR+TXVA98USMV090C2017.511.07.826,600212539016
      EAC4X49C+TDRA98USMV090C1617.511.07.826,600212539023
      EAC4X49C+TDRA98USMV090C2017.511.07.826,600212539025
      EAH1P48C+TDR+TXVA98USMV090C1617.511.07.827,000212539029
      EAH1P48C+TDR+TXVA98USMV090C2017.511.07.827,000212539031
      EAH1P48C+TDR+TXVA98USMV110C2017.511.07.827,000212539033
      EA(C;U)1P49C+TDR+TXVA98USMV090C1617.511.07.826,600212539103
      EA(C;U)1P49C+TDR+TXVA98USMV090C2017.511.07.826,600212539106
      EAC4X49C+TDRA98USMV090C1617.511.07.826,600212539112
      EAC4X49C+TDRA98USMV090C2017.511.07.826,600212539116
      EAH1P48C+TDR+TXVA98USMV090C1617.511.07.827,000212539121
      EAH1P48C+TDR+TXVA98USMV090C2017.511.07.827,000212539123
      EAH1P48C+TDR+TXVA98USMV110C2017.511.07.827,000212539126
      7EC49CX-0*+TDRA98USMV090C1617.511.07.826,600214729483
      7EC49CX-0*+TDRA98USMV090C2017.511.07.826,600214729484
      7EH48CX-0*+TDRA98USMV090C1617.511.07.827,000214729540
      7EH48CX-0*+TDRA98USMV090C2017.511.07.827,000214729541
      7EH48CX-0*+TDRA98USMV110C2017.511.07.827,000214729542
      7EC49CX-0*+TDRA98USMV090C1617.511.07.826,600214730177
      7EC49CX-0*+TDRA98USMV090C2017.511.07.826,600214730178
      7EH48CX-0*+TDRA98USMV090C1617.511.07.827,000214730243
      7EH48CX-0*+TDRA98USMV090C2017.511.07.827,000214730245
      7EH48CX-0*+TDRA98USMV110C2017.511.07.827,000214730248
      EA(C;U)1P49C+TDR+TXVA98USMV110C2017.111.07.826,400212539018
      EAC4X49C+TDRA98USMV110C2017.111.07.826,400212539027
      EA(C;U)1P49C+TDR+TXVA98USMV110C2017.111.07.826,400212539108
      EAC4X49C+TDRA98USMV110C2017.111.07.826,400212539118
      7EC49CX-0*+TDRA98USMV110C2017.111.07.826,400214729485
      7EC49CX-0*+TDRA98USMV110C2017.111.07.826,400214730179
      EA(C,U)1P49C+TDR+TXVA97UH2E110C2016.011.57.826,200213927734
      EAC4X49C+TDRA97UH2E110C2016.011.57.826,200213927735
      EA(C,U)1P49C+TDR+TXVA97UH2E110C2016.011.57.826,200213927737
      EAC4X49C+TDRA97UH2E110C2016.011.57.826,200213927738
      7EC49CX-0*+TDRA97UH2E110C2016.011.57.826,200214729473
      7EC49CX-0*+TDRA97UH2E110C2016.011.57.826,200214730162
      Yearly running cost in 10 large cities$1,254-$3,684

      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 4SHP18LX160P?
      The Armstrong Air 4SHP18LX160P is rated at up to 17.5 SEER2 and 11.0 EER2 for cooling and up to 7.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 36 certified matchups SEER2 ranges from 16.0-17.5.
      Is the Armstrong Air 4SHP18LX160P 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 4-ton model.
      How much does the Armstrong Air 4SHP18LX160P cost to run per year?
      At its rated efficiency it costs about $1,254-$3,684 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,592 in Phoenix and $3,113 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 4SHP18LX160P?
      ENERGY STAR lists 36 certified combinations for this outdoor unit. The highest-rated ones use EA(C;U)1P49C+TDR+TXV, EAC4X49C+TDR, EAH1P48C+TDR+TXV.
      What refrigerant does the Armstrong Air 4SHP18LX160P 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 $1,603/yrYou save $795/yrSee details ↓
      1. Where you live
      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.

      2. The heat pump Armstrong Air 4SHP18LX160P
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,603
      Current system, per year
      $2,398
      You save per year
      $795
      Payback
      22.0 years
      Net after 10 years
      -$9,554

      Cooling $935Heating $668Electricity used: 10,019 kWhSaved vs. a minimum-efficiency heat pump: $236

      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.

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      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of June 2, 2026. How we use the data.