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      8,300 BTU U-shaped window air conditioner

      GREE GJC08BU-A6DRNJ2A

      Very good efficiency for its size: a CEER of 16.0 ranks #9 of 29 8,000 BTU window air conditioners.

      It cools a room of about 300-350 sq ft, draws about 519 watts and costs about $70 a year to run at typical U.S. use and prices.

      CEER
      16.0 Combined efficiency, higher is better
      Very good · beats 83%
      Cooling
      8,300 BTU/hFor about 300-350 sq ft
      Energy use
      389 kWh/yr47% less than the federal minimum
      Unit size
      21" wide 13" high, 18" deep, 61 lb

      A good fit if…

      • You want low bills - its CEER beats 83% of 8,000 BTU window air conditioners.
      • You want a quieter room and a usable window - the window closes into the U, so the compressor sits outside the glass.
      • You want to plug it into an ordinary outlet - it runs on 115 V.
      • You want the very top tier - it meets the ENERGY STAR Most Efficient criteria.

      Think twice if…

      • You also need heat - it cools only.

      Calculate my running costCheck the size for my room

      Details

      Specifications8,300 BTU, 115 V
      General
      BrandGREE
      Model numberGJC08BU-A6DRNJ2A
      TypeWindow
      DesignU-shaped (window closes through it)
      HeatingNo, cooling only
      CompressorVariable speed (inverter)
      Voltage115 V (standard outlet)
      RefrigerantR-32 (GWP 675)
      Support bracket includedYes
      On the market sinceNovember 28, 2024
      Last certifiedNovember 25, 2024
      Performance
      Cooling capacity8,300 BTU/h
      CEERCombined energy efficiency ratio, includes standby power16.0
      Yearly energy useENERGY STAR test: 750 hours389 kWh
      Better than federal minimum47% less energy
      ENERGY STAR Most EfficientYes
      Size
      Width × height × depth21" W × 13" H × 18" D
      Weight61 lb
      How it compares with 28 other 8,000 BTU window units#9 of 29
      • CEER (class median 15.0)16.0, tied with 7 others
      • Yearly cost vs. class median ($72)$2 less
      • Width 21" (class median 19.4")narrower than 21%
      • Weight 61 lb (class median 56 lb)lighter than 21%
      • Rank among 10 similar designs (U-shaped)#4

      Compared with the other ENERGY STAR certified 8,000 BTU window units. Yearly cost at 750 hours and 18.0¢/kWh.

      Questions7
      How many square feet does the GREE GJC08BU-A6DRNJ2A cool?
      At 8,300 BTU/h it suits a room of about 300 to 350 sq ft with normal sun and two people, following the ENERGY STAR sizing guide. In a heavily shaded room that stretches to about 330-385 sq ft; in a very sunny one it shrinks to 270-315 sq ft. A kitchen needs 4,000 BTU more.
      How many watts and amps does the GREE GJC08BU-A6DRNJ2A use?
      About 519 watts at full power (8,300 BTU/h divided by its CEER of 16.0), which is 4.5 amps at 115 V. That is 14 W less than the typical unit in its class (533 W), or $2 a year cheaper to run at 18.0¢/kWh. Its inverter compressor slows down instead of cycling, so real use is usually lower. Its CEER beats 69% of the 29 units in the class.
      Can the GREE GJC08BU-A6DRNJ2A run on a standard outlet?
      Yes. It runs on 115 V and draws about 4.5 A, well inside a standard 15 A outlet, but do not share the circuit with a space heater, microwave or other big load. Every certified unit in this class is 115 V.
      What are the dimensions of the GREE GJC08BU-A6DRNJ2A, and will it fit my window?
      21" W × 13" H × 18" D, 61 lb. It is narrower than 21% of its 28 competitors and lighter than 21% of them. The window closes into the U-shaped slot, so measure the opening height as well as the width: you need at least the unit's 21" width between the frame sides.
      Is the GREE GJC08BU-A6DRNJ2A U-shaped design an advantage?
      Mostly yes. The sash closes into the unit, so the window stays sealed and daylight comes in, and the compressor is outside the glass, which cuts noise indoors. The trade-off is a window that must slide up and down, and a few extra steps to fit the foam seals.
      Can the GREE GJC08BU-A6DRNJ2A also heat the room?
      No, it only cools. If you also need heat, 4 certified units in this class can do both; see the list of air conditioners with heat.
      Is the GREE GJC08BU-A6DRNJ2A worth buying to replace an old air conditioner?
      An old unit of the same size at 9 CEER would cost about $125 a year to run at 750 hours and 18.0¢/kWh; this one costs about $70, so it saves roughly $55 a year.

      Running cost calculator

      Pre-filled with this model. Pick your state and how many hours you run it, or see the yearly cost in every state.

      1. The air conditioner GREE GJC08BU-A6DRNJ2A
      2. How you use it
      Per year
      $110
      Per month of use
      $20
      Per day
      $0.66
      Per hour
      8.3¢
      Power draw
      519 W

      Electricity used: 685 kWh a yearAn old 9 CEER unit of the same size would cost $195

      Power draw is capacity divided by CEER, which already includes standby power. Inverter units often run below full power, so real use can be lower. Electricity prices: U.S. EIA residential averages (12 months to July 2026). Days a year start from your state's cooling degree days (NOAA 1991-2020 normals).

      Closest alternatives

      Units with a similar CEER in the same class, and what sets each one apart from the GREE GJC08BU-A6DRNJ2A.

      ModelCEERCompared with this one
      Midea MWEUWA-08CRFN8-BCP016.0same CEER, 1.8" narrower, 8 lb lighter, standard box
      Midea MAW08V1WBK16.0same CEER, 2" narrower, 17 lb lighter, standard box
      GE PWJV08W16.0same CEER, 2.4" narrower, 14 lb lighter, standard box
      Midea 101045131516.0same CEER, 1.8" narrower, 6 lb lighter
      Whirlpool WHAW081CX16.0same CEER, 2.4" narrower, 18 lb lighter

      See all 29 8,000 BTU window air conditioners, ranked

      Source: ENERGY STAR Certified Room Air Conditioners (U.S. EPA), certification of November 25, 2024. How we use the data.