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      14,300 BTU through-the-wall air conditioner with heat

      Wallmaster WHVT14B33B

      Below average efficiency for its size: a CEER of 12.8 ranks #13 of 15 through-the-wall air conditioners.

      It cools a room of about 550-700 sq ft, draws about 1117 watts and costs about $151 a year to run at typical U.S. use and prices.

      CEER
      12.8 Combined efficiency, higher is better
      Below average · beats 17%
      Cooling
      14,300 BTU/hFor about 550-700 sq ft
      Energy use
      838 kWh/yr47% less than the federal minimum
      Unit size
      26.5" wide 15.8" high, 21" deep, 115 lb

      A good fit if…

      • You want heat in spring and fall - it runs as a heat pump in reverse.
      • You want the very top tier - it meets the ENERGY STAR Most Efficient criteria.

      Think twice if…

      • Running cost matters most - its CEER is below average for through-the-wall air conditioners.
      • You only have ordinary outlets - it needs a 230 V circuit and plug.
      • You plan to install it alone - at 115 lb it is a two-person job.
      • You want to mount it in a window - it needs a wall sleeve.

      Calculate my running costCheck the size for my room

      Details

      Specifications14,300 BTU, 230 V
      General
      BrandWallmaster
      Model numberWHVT14B33B
      TypeThrough-the-wall
      HeatingYes (heat pump, reverse cycle)
      CompressorVariable speed (inverter)
      Voltage230 V (needs a 230 V outlet)
      RefrigerantR-32 (GWP 675)
      Support bracket includedNo
      On the market sinceJune 2, 2026
      Last certifiedJune 17, 2026
      Performance
      Cooling capacity14,300 BTU/h
      CEERCombined energy efficiency ratio, includes standby power12.8
      Yearly energy useENERGY STAR test: 750 hours838 kWh
      Better than federal minimum47% less energy
      ENERGY STAR Most EfficientYes
      Size
      Width × height × depth26.5" W × 15.8" H × 21" D
      Weight115 lb
      How it compares with 14 other through-the-wall units#13 of 15
      • CEER (class median 13.9)12.8, no ties
      • Yearly cost vs. class median ($117)$34 more
      • Width 26.5" (class median 26.5")narrower than 0%
      • Weight 115 lb (class median 90 lb)lighter than 0%
      • Rank among 2 similar designs that heat#1

      Compared with the other ENERGY STAR certified through-the-wall units. Yearly cost at 750 hours and 18.0¢/kWh.

      Questions6
      How many square feet does the Wallmaster WHVT14B33B cool?
      At 14,300 BTU/h it suits a room of about 550 to 700 sq ft with normal sun and two people, following the ENERGY STAR sizing guide. In a heavily shaded room that stretches to about 605-770 sq ft; in a very sunny one it shrinks to 495-630 sq ft. A kitchen needs 4,000 BTU more.
      How many watts and amps does the Wallmaster WHVT14B33B use?
      About 1117 watts at full power (14,300 BTU/h divided by its CEER of 12.8), which is 4.9 amps at 230 V. That is 254 W more than the typical unit in its class (863 W), or $34 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 13% of the 15 units in the class.
      What outlet does the Wallmaster WHVT14B33B need?
      It is a 230 V unit that draws 4.9 A, so it needs its own 230 V circuit with a matching plug (typically NEMA 6-15 or 6-20). If the room has only ordinary 115 V outlets, an electrician has to add one. Only 60% of the 15 certified units in this class are 230 V.
      What are the dimensions of the Wallmaster WHVT14B33B, and will it fit my window?
      26.5" W × 15.8" H × 21" D, 115 lb. It is narrower than 0% of its 14 competitors and lighter than 0% of them. It slides into a wall sleeve, so compare the sleeve opening with the unit before buying.
      How does the Wallmaster WHVT14B33B heat?
      It reverses its refrigerant cycle to work as a heat pump, which makes it one of only 2 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 Wallmaster WHVT14B33B worth buying to replace an old air conditioner?
      An old unit of the same size at 9 CEER would cost about $215 a year to run at 750 hours and 18.0¢/kWh; this one costs about $151, so it saves roughly $64 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 Wallmaster WHVT14B33B
      2. How you use it
      Per year
      $236
      Per month of use
      $43
      Per day
      $1.43
      Per hour
      17.9¢
      Power draw
      1117 W

      Electricity used: 1,475 kWh a yearAn old 9 CEER unit of the same size would cost $336

      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 Wallmaster WHVT14B33B.

      ModelCEERCompared with this one
      Friedrich WCVT10B30A13.00.2 CEER higher, 25 lb lighter, cooling only
      Friedrich WCVT16B30A12.60.2 CEER lower, 5 lb lighter, cooling only
      Friedrich WCVT10B10A13.00.2 CEER higher, 25 lb lighter, cooling only, 115 V
      Friedrich WCVT12B10A13.20.4 CEER higher, 5 lb lighter, cooling only, 115 V
      Friedrich WHVT14B33A12.00.8 CEER lower

      See all 15 through-the-wall air conditioners, ranked

      Source: ENERGY STAR Certified Room Air Conditioners (U.S. EPA), certification of June 17, 2026. How we use the data.