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      8,100 BTU U-shaped window air conditioner

      HOUSE KOBO KOBOGJC08BU

      Average efficiency for its size: a CEER of 15.5 ranks #10 of 29 8,000 BTU window air conditioners.

      It cools a room of about 250-350 sq ft, draws about 523 watts and costs about $71 a year to run at typical U.S. use and prices.

      CEER
      15.5 Combined efficiency, higher is better
      Average · beats 66%
      Cooling
      8,100 BTU/hFor about 250-350 sq ft
      Energy use
      392 kWh/yr42% less than the federal minimum
      Unit size
      21" wide 13" high, 18" deep, 61 lb

      A good fit if…

      • 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.

      Think twice if…

      • You also need heat - it cools only.

      Calculate my running costCheck the size for my room

      Details

      Specifications8,100 BTU, 115 V
      General
      BrandHOUSE KOBO
      Model numberKOBOGJC08BU
      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 sinceAugust 2, 2025
      Last certifiedAugust 2, 2025
      Performance
      Cooling capacity8,100 BTU/h
      CEERCombined energy efficiency ratio, includes standby power15.5
      Yearly energy useENERGY STAR test: 750 hours392 kWh
      Better than federal minimum42% less energy
      ENERGY STAR Most EfficientNo
      Size
      Width × height × depth21" W × 13" H × 18" D
      Weight61 lb
      How it compares with 28 other 8,000 BTU window units#10 of 29
      • CEER (class median 15.0)15.5, tied with 1 other
      • Yearly cost vs. class median ($72)$1 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)#5

      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 HOUSE KOBO KOBOGJC08BU cool?
      At 8,100 BTU/h it suits a room of about 250 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 275-385 sq ft; in a very sunny one it shrinks to 225-315 sq ft. A kitchen needs 4,000 BTU more.
      How many watts and amps does the HOUSE KOBO KOBOGJC08BU use?
      About 523 watts at full power (8,100 BTU/h divided by its CEER of 15.5), which is 4.5 amps at 115 V. That is 10 W less than the typical unit in its class (533 W), or $1 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 62% of the 29 units in the class.
      Can the HOUSE KOBO KOBOGJC08BU 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 HOUSE KOBO KOBOGJC08BU, 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 HOUSE KOBO KOBOGJC08BU 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 HOUSE KOBO KOBOGJC08BU 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 HOUSE KOBO KOBOGJC08BU worth buying to replace an old air conditioner?
      An old unit of the same size at 9 CEER would cost about $122 a year to run at 750 hours and 18.0¢/kWh; this one costs about $71, so it saves roughly $51 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 HOUSE KOBO KOBOGJC08BU
      2. How you use it
      Per year
      $110
      Per month of use
      $20
      Per day
      $0.67
      Per hour
      8.4¢
      Power draw
      523 W

      Electricity used: 690 kWh a yearAn old 9 CEER unit of the same size would cost $190

      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 HOUSE KOBO KOBOGJC08BU.

      ModelCEERCompared with this one
      LG LW8022IVSM15.5same CEER, 1.4" narrower, saddle design
      Friedrich CCV08A10A15.00.5 CEER lower, 4 lb lighter, standard box
      Midea MAW08HV1KWT-A15.10.4 CEER lower, 1.6" narrower, 5 lb lighter, standard box, also heats
      Midea MAW08V1KWT-A15.10.4 CEER lower, 1.8" narrower, 8 lb lighter, standard box
      GREE GJC08BU-A6DRNJ2A16.00.5 CEER higher

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

      Source: ENERGY STAR Certified Room Air Conditioners (U.S. EPA), certification of August 2, 2025. How we use the data.