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      2.5-ton central heat pump · INFINITY 18VS HEAT PUMP 2-STAGE

      Carrier 25VNA837A*031*+TSTAT

      Average cooling efficiency and below average heating efficiency for a 2.5-ton central heat pump, but not rated for cold climates.

      Ranks #50 of 199 2.5 ton central heat pumps for cooling efficiency, and costs about $1,267 a year to run in a mixed climate like Atlanta.

      SEER2
      18.0 Cooling efficiency over a season
      Average · beats 66%
      HSPF2
      8.5 Heating efficiency over a season
      Below average · beats 38%
      EER2
      12.0 Cooling efficiency on a 95°F day
      Average · beats 64%
      Heat at 5°F
      24,400 BTU/h51% of its 47°F output
      Below average · beats 31%

      A good fit if…

      • You want a choice of indoor units - 83 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

      Specifications2.5 ton, R-410A
      General
      BrandCarrier
      Outdoor unit model25VNA837A*031*+TSTAT
      SeriesINFINITY 18VS HEAT PUMP 2-STAGE
      TypeCentral heat pump
      Nominal size2.5 ton
      CompressorVariable-speed units run longer at low powerTwo-stage
      RefrigerantR-410A
      Connected (smart) capableNo
      On the market sinceMarch 11, 2021
      Last certifiedMay 15, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better18.0 (range 17.0-18.0)
      EER2Efficiency at 95°F outdoors11.7-12.0
      Cooling capacity31,600-33,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.1-8.5
      Capacity at 47°F46,000-48,000 BTU/h
      Capacity at 17°F30,200-31,000 BTU/h
      Capacity at 5°F8,000-24,400 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.94-1.98
      ENERGY STAR cold climateNo
      Heating output as it gets colder51% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with CNPV*6024AL at the standard test temperatures, in BTU/h:

      Certified matchups83 indoor units

      The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 83 are shown. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      CNPV*6024AL58SP*A090V24**2018.012.08.124,200210464989
      CNPV*6024AL58TP*A135V24**2218.012.08.124,000210465022
      CNPV*6024AL59TP6B100V21**2218.012.08.124,000210464933
      CNPV*6024ALGG96VTAA60100C18.012.08.124,000210464934
      CAP**6121AL58SP*A090V21**2018.011.78.18,000210461411
      CAP**6121AL59TP6B100V21**2218.011.78.124,200210461322
      CAP**6124AL58TP*A090V21**2018.011.78.18,000210461834
      CAP**6124AL59TP6B080V21**2018.011.78.18,000210461958
      CAP**6124AL59TP6B120V24**2218.011.78.124,200210461847
      CAP**6124AL59TP6B100V21**2218.011.78.18,000210461756
      CAP**6124AL58SP*A090V21**2018.011.78.18,000210461801
      CAP**6121AL58TP*A090V17**1618.011.78.124,200210461422
      CAP**6124AL58TP*A135V24**2218.011.78.124,200210461845
      CAP**6124AL59SP6A120V24**2218.011.78.18,000210461745
      CAP**6124AL59SP6A100V21**2018.011.78.124,200210461734
      CAP**6121AL58TP*A090V21**2018.011.78.18,000210461424
      CAP**6024AL59TP6B100V21**2218.011.78.124,200210460977
      CAP**6124AL59TP6B100V21**2018.011.78.124,200210461969
      CAP**6124ALGG96VTAA66120D18.011.78.124,200210461848
      CAP**6121ALGG96VTAA60100C18.011.78.124,200210461323
      CAP**6124ALGG96VTAA60100C18.011.78.124,200210461757
      CAP**6024ALGG96VTAA60100C18.011.78.124,200210460978
      CAP**6124AL58SP*A110V24**2217.511.78.524,200210461823
      CAP**4321AL59TP6B100V21**2217.511.78.58,000210459733
      CAP**3721AL59TP6B100V21**2217.511.78.58,000210458476
      CAP**3721ALGG96VTAA60100C17.511.78.524,400210458477
      CAP**4321ALGG96VTAA60100C17.511.78.524,400210459734
      CNPV*6024AL58SP*A090V21**2017.512.08.124,000210464978
      CNPV*4824AL58SP*A110V24**2217.512.08.124,200210464677
      CNPV*4824AL59TP6B100V21**2217.512.08.124,200210464610
      CNPV*4824ALGG96VTAA60100C17.512.08.124,200210464611
      CNPV*4821ALGG96VTAA60100C17.512.08.124,200210464166
      CNPV*4821AL59TP6B100V21**2217.512.08.124,200210464165
      CNPV*6024AL58SP*A110V24**2217.512.08.124,000210465000
      CNPV*6024AL58TP*A090V21**2017.512.08.124,000210465011
      CNPV*6024AL59SP6A080V21**2017.512.08.124,200210464900
      CNPV*6024AL59SP6A100V21**2017.512.08.124,000210464911
      CNPV*6024AL59SP6A120V24**2217.512.08.124,000210464922
      CNPV*6024AL59TP6B100V21**2017.512.08.124,200210465146
      CNPV*6024AL59TP6B120V24**2217.512.08.124,000210465024
      CNPV*6024ALGG96VTAA66120D17.512.08.124,000210465025
      CAP**6124AL58SP*A090V24**2017.511.78.124,200210461812
      CAP**6024AL58SP*A090V24**2017.511.78.124,200210461033
      CAP**6121AL58TP*A070V17**1617.511.78.124,200210461447
      CAP**6121AL59TP6B100V21**2017.511.78.124,200210461613
      CAP**6124AL59SP6A080V21**2017.511.78.124,200210461723
      CAP**6024AL58SP*A110V24**2217.511.78.124,200210461044
      CAP**6024AL59SP6A100V21**2017.511.78.124,200210460955
      CAP**6024AL58TP*A135V24**2217.511.78.124,000210461066
      CNPV*4824AL59TP6B100V21**2017.511.78.124,000210464823
      CAP**6024AL58TP*A090V21**2017.511.78.124,000210461055
      CNPV*4824AL58TP*A135V24**2217.511.78.124,000210464699
      CNPV*4824AL59TP6B080V21**2017.511.78.124,000210464812
      CNPV*4821AL59TP6B100V21**2017.511.78.124,000210464467
      CNPV*4821AL58TP*A090V17**1617.511.78.124,000210464265
      CAP**6121AL59SP6A100V21**2017.511.78.124,200210461300
      CNPV*4824AL58SP*A090V21**2017.511.78.124,000210464655
      CNPV*4821AL58TP*A070V17**1617.511.78.124,000210464301
      CAP**6121AL59SP6A080V21**2017.511.78.124,200210461289
      CNPV*4824AL59SP6A100V21**2017.511.78.124,000210464588
      Yearly running cost in 10 large cities$856-$3,254

      At each state's average electricity price and the city's typical heating and cooling hours.

      Questions5
      What is the SEER2 rating of the Carrier 25VNA837A*031*+TSTAT?
      The Carrier 25VNA837A*031*+TSTAT is rated at up to 18.0 SEER2 and 12.0 EER2 for cooling and up to 8.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 83 certified matchups SEER2 ranges from 17.0-18.0.
      Is the Carrier 25VNA837A*031*+TSTAT 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 2.5-ton model.
      How much does the Carrier 25VNA837A*031*+TSTAT cost to run per year?
      At its rated efficiency it costs about $856-$3,254 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,189 in Phoenix and $2,822 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 Carrier 25VNA837A*031*+TSTAT?
      ENERGY STAR lists 83 certified combinations for this outdoor unit. The highest-rated ones use CNPV*6024AL, CAP**6121AL, CAP**6124AL.
      What refrigerant does the Carrier 25VNA837A*031*+TSTAT 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 $1,249/yrYou save $653/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 Carrier 25VNA837A*031*+TSTAT
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,249
      Current system, per year
      $1,902
      You save per year
      $653
      Payback
      18.4 years
      Net after 10 years
      -$5,465

      Cooling $630Heating $619Electricity used: 7,806 kWhSaved vs. a minimum-efficiency heat pump: $245

      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 2.5 ton models

      See all 199 2.5 ton central heat pumps, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of May 15, 2025. How we use the data.