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

      InfinityLiving EZ-18Z-M2B

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

      Ranks #95 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $446 a year to run in a mixed climate like Atlanta.

      SEER2
      23.9 Cooling efficiency over a season
      Very good · beats 72%
      HSPF2
      10.0 Heating efficiency over a season
      Average · beats 43%
      EER2
      13.0 Cooling efficiency on a 95°F day
      Average · beats 62%
      Heat at 5°F
      13,300 BTU/h74% of its 47°F output
      Very good · beats 86%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 72% of mini-splits.
      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 13,300 BTU/h at 5°F.
      • You want steady temperatures and quiet running - the compressor varies its speed.

      Think twice if…

      • Nothing stands out - its ratings have no weak spot for its class.

      Calculate my running cost

      Details

      Specifications18,000 BTU, R-454B
      General
      BrandInfinityLiving
      Also sold asDIYCOOL, PolarWave, 1HVAC
      Outdoor unit modelEZ-18Z-M2B
      SeriesEZ Series
      TypeMini-split heat pump
      Nominal size18,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceFebruary 10, 2025
      Last certifiedMarch 4, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better23.9 (range 23.9)
      EER2Efficiency at 95°F outdoors13.0
      Cooling capacity18,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better10.0
      Capacity at 47°F18,000 BTU/h
      Capacity at 17°F13,400 BTU/h
      Capacity at 5°F13,300 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.30
      ENERGY STAR cold climateYes
      Heating output as it gets colder74% kept at 5°F

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

      Certified matchups4 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 unitSEER2EER2HSPF2Heat @5°FAHRI ref.
      - · cold climate23.913.010.013,300216980909
      - DIYCOOL · cold climate23.913.010.013,300216980919
      - PolarWave · cold climate23.913.010.013,300216980929
      - 1HVAC · cold climate23.913.010.013,300216980939
      Yearly running cost in 10 large cities$356-$1,100

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

      Questions4
      What is the SEER2 rating of the InfinityLiving EZ-18Z-M2B?
      The InfinityLiving EZ-18Z-M2B is rated at up to 23.9 SEER2 and 13.0 EER2 for cooling and up to 10.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the InfinityLiving EZ-18Z-M2B good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 13,300 BTU/h at 5°F with a COP of 2.30, so it is still 2.3 times as efficient as electric resistance heat at that temperature.
      How much does the InfinityLiving EZ-18Z-M2B cost to run per year?
      At its rated efficiency it costs about $356-$1,100 a year in electricity in large U.S. cities, depending on climate and local rates - for example $460 in Phoenix and $935 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      What refrigerant does the InfinityLiving EZ-18Z-M2B 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 $467/yrYou save $461/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 InfinityLiving EZ-18Z-M2B
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $467
      Current system, per year
      $928
      You save per year
      $461
      Payback
      15.2 years
      Net after 10 years
      -$2,386

      Cooling $265Heating $202Electricity used: 2,917 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.

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      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of March 4, 2025. How we use the data.