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      12,000 BTU U-shaped window air conditioner with heat

      Midea MAW12HV1CWT

      Below average efficiency for its size: a CEER of 13.3 ranks #33 of 34 12,000 BTU window air conditioners.

      It cools a room of about 450-550 sq ft, draws about 902 watts and costs about $122 a year to run at typical U.S. use and prices.

      CEER
      13.3 Combined efficiency, higher is better
      Below average · beats 4%
      Cooling
      12,000 BTU/hFor about 450-550 sq ft
      Energy use
      677 kWh/yr36% less than the federal minimum
      Unit size
      19.4" wide 13.9" high, 22.2" deep, 58 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 heat in spring and fall - it runs as a heat pump in reverse.
      • You want to plug it into an ordinary outlet - it runs on 115 V.

      Think twice if…

      • Running cost matters most - its CEER is below average for 12,000 BTU window air conditioners.

      Calculate my running costCheck the size for my room

      Details

      Specifications12,000 BTU, 115 V
      General
      BrandMidea
      Also sold asKeystone, LUBECK
      Model numberMAW12HV1CWT
      TypeWindow
      DesignU-shaped (window closes through it)
      HeatingYes (heat pump, reverse cycle)
      CompressorVariable speed (inverter)
      Voltage115 V (standard outlet)
      RefrigerantR-32 (GWP 675)
      Support bracket includedNo
      On the market sinceMarch 22, 2023
      Last certifiedNovember 24, 2025
      Performance
      Cooling capacity12,000 BTU/h
      CEERCombined energy efficiency ratio, includes standby power13.3
      Yearly energy useENERGY STAR test: 750 hours677 kWh
      Better than federal minimum36% less energy
      ENERGY STAR Most EfficientNo
      Size
      Width × height × depth19.4" W × 13.9" H × 22.2" D
      Weight58 lb
      How it compares with 33 other 12,000 BTU window units#33 of 34
      • CEER (class median 15.0)13.3, no ties
      • Yearly cost vs. class median ($108)$14 more
      • Width 19.4" (class median 20.7")narrower than 64%
      • Weight 58 lb (class median 59 lb)lighter than 67%

      Compared with the other ENERGY STAR certified 12,000 BTU window units. Yearly cost at 750 hours and 18.0¢/kWh.

      Same unit, other model numbers4

      These model numbers have the same capacity, efficiency, energy use, dimensions and weight as the Midea MAW12HV1CWT: the same unit under another brand, or with a colour or retailer code. Everything on this page applies to them.

      • Midea MAW12HV1CWT-A
      • Midea MWAUQB-12HRFN8-BCL0
      • Keystone KSTAW12INV-HC
      • LUBECK 57H-ID0-B12HRFN8BCL0
      Questions8
      How many square feet does the Midea MAW12HV1CWT cool?
      At 12,000 BTU/h it suits a room of about 450 to 550 sq ft with normal sun and two people, following the ENERGY STAR sizing guide. In a heavily shaded room that stretches to about 495-605 sq ft; in a very sunny one it shrinks to 405-495 sq ft. A kitchen needs 4,000 BTU more.
      How many watts and amps does the Midea MAW12HV1CWT use?
      About 902 watts at full power (12,000 BTU/h divided by its CEER of 13.3), which is 7.8 amps at 115 V. That is 102 W more than the typical unit in its class (800 W), or $14 a year dearer to run at 18.0¢/kWh. Its inverter compressor slows down instead of cycling, so real use is usually lower. Its CEER beats 3% of the 34 units in the class.
      Can the Midea MAW12HV1CWT run on a standard outlet?
      Yes. It runs on 115 V and draws about 7.8 A, well inside a standard 15 A outlet, but do not share the circuit with a space heater, microwave or other big load. 12% of certified units in this class need 230 V, so a 115 V model is the easy case.
      What are the dimensions of the Midea MAW12HV1CWT, and will it fit my window?
      19.4" W × 13.9" H × 22.2" D, 58 lb. It is narrower than 64% of its 33 competitors and lighter than 67% 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 19.4" width between the frame sides.
      Is the Midea MAW12HV1CWT 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.
      How does the Midea MAW12HV1CWT heat?
      It reverses its refrigerant cycle to work as a heat pump, which makes it one of only 5 certified units in its class that heat. Heating output is not part of the ENERGY STAR data, so ask the maker for its heating capacity and lowest outdoor temperature before relying on it in winter.
      Is the Midea MAW12HV1CWT worth buying to replace an old air conditioner?
      An old unit of the same size at 9 CEER would cost about $180 a year to run at 750 hours and 18.0¢/kWh; this one costs about $122, so it saves roughly $58 a year.
      Is the Midea MAW12HV1CWT the same as the Midea MAW12HV1CWT-A?
      As far as the certified data goes, yes. ENERGY STAR lists 5 model numbers with the same capacity, efficiency, energy use, dimensions and weight, which means the same unit sold under another brand or with a different colour or retailer code. The full list is on this page.

      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 Midea MAW12HV1CWT
      2. How you use it
      Per year
      $191
      Per month of use
      $35
      Per day
      $1.15
      Per hour
      14.4¢
      Power draw
      902 W

      Electricity used: 1,191 kWh a yearAn old 9 CEER unit of the same size would cost $282

      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 Midea MAW12HV1CWT.

      ModelCEERCompared with this one
      GE Appliances AWGP12W13.20.1 CEER lower, 10 lb lighter, standard box
      GE Profile PHNT12CCH114.71.4 CEER higher, 22 lb heavier, saddle design, cooling only
      Midea MAW12HV1KWT-A14.41.1 CEER higher, standard box
      GREE GJC12BU-A6DRNJ2A14.71.4 CEER higher, 1.6" wider, 7 lb heavier, cooling only
      GE Profile PWDV12W15.01.7 CEER higher, 8 lb lighter, standard box, cooling only

      See all 34 12,000 BTU window air conditioners, ranked

      Source: ENERGY STAR Certified Room Air Conditioners (U.S. EPA), certification of November 24, 2025. How we use the data.