Whirlpool · Model WHAT122-HAW
12,000 BTU Through-The-Wall Air Conditioner 230V - With Heat
A through-the-wall air conditioner rated at 12,000 BTU for rooms up to 550 sq ft. It heats in winter too and installs in a wall sleeve.
$599.99
Live price at SylvanePrice checked Oct 27, 2026
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Will it cool your room?
This unit's cooling matches your 550 sq ft room.
At a glance
Best for replacing a through-the-wall unit in an existing wall sleeve.
Performance
- Cooling capacity
- 12,000 BTU · 3.5 kW
- Power while cooling
- 980 W, about $0.18 an hour
- Heating capacity
- 10,600 BTU
- Heat source
- Electric coil
- Power at rated heat
- 3,650 W, about $0.67 an hour
- Room coverage
- up to 550 sq ft
- Energy Star
- Not published
- CEER
- Not published
- Annual energy (cooling)
- Not published
Noise, size & features
- Model number
- WHAT122-HAW
- Indoor noise
- 56 dB(A)about as loud as a dishwasher
- Outdoor noise
- Not published
- Indoor unit
- 24.2 x 14.5 x 20.2 in
- Outdoor unit
- None
- Refrigerant
- R-32
- Wi-Fi / app
- Not published
- Outdoor unit needed
- No
- Power supply
- 208/230 V, NEMA 6-15P plug
- Wall sleeve
- Fits a 26 in. standard sleeve
- Warranty
- 1-Year Replacement Warranty (Cool Models Only) 1-Year Limited Warranty (Heat Models Only)
Heating capacity, heating power, supply voltage, plug, cooling power, refrigerant and warranty are from Sylvane's published specifications for this exact configuration, checked Oct 27, 2026.
Power while cooling: From the maximum cooling draw its retailer lists for this exact model. An hour's cost is at that draw and the US average electricity price of 18.44¢/kWh (U.S. Energy Information Administration, Electric Power Monthly Table 5.6.A (residential average, May 2026)). The compressor cycles once the room is cool, so most hours cost less.
Hourly heating cost: At the rated heating output and the US average electricity price of 18.44¢/kWh (U.S. Energy Information Administration, Electric Power Monthly Table 5.6.A (residential average, May 2026)). A thermostat cycles the heat, so most hours cost less. A heat pump's output and advantage shrink as it gets colder outside, and one with an electric back-up heater draws far more while that runs.
Will it fit your wall sleeve?
Whirlpool's manual gives its standard sleeve as 26 inches wide, 15¾ high and 16¾ deep, and asks you to check that another maker's sleeve suits the unit before installing. A universal interior trim kit for an existing standard sleeve comes with it; new sleeves are sold separately. Source: Whirlpool installation manual
Every through-the-wall AC and PTAC by the sleeve it fitsWhat is good
- At $600 it undercuts 12 of the 13 other 12,000-14,000 BTU through-the-wall units we list with a live price.
- Uses R-32 (GWP 675), the low-GWP class new US residential equipment moved to.
Installation & the rules that apply
This is a through-the-wall air conditioner. It sits in a sleeve built into an exterior wall, so the window-unit mounting and bracket rules do not apply to it. Swapping it into an existing sleeve is a like-for-like replacement; cutting a new opening changes the building's exterior wall, which usually needs a building permit and, in a condo, co-op or historic building, approval first.
Slides into a wall sleeve
R-32
Common questions about the Whirlpool 12,000 BTU Through-The-Wall Air Conditioner 230V - With Heat
- How loud is the Whirlpool 12,000 BTU Through-The-Wall Air Conditioner 230V - With Heat?
- 56 dB(A) indoors, about as loud as a dishwasher.
- How many watts does the Whirlpool 12,000 BTU Through-The-Wall Air Conditioner 230V - With Heat use?
- It draws 980 watts while cooling at full power, per its retailer's specification for this exact model. At the US average electricity price that is about $0.18 an hour; once the room is cool the compressor cycles, so most hours cost less.
- What size room does the Whirlpool 12,000 BTU Through-The-Wall Air Conditioner 230V - With Heat cool?
- It is rated to cool a room up to 550 sq ft (12,000 BTU · 3.5 kW).
- Do I need a professional to install the Whirlpool 12,000 BTU Through-The-Wall Air Conditioner 230V - With Heat?
- Not to replace a unit, but usually yes for a new opening. Sliding it into an existing wall sleeve it fits is a job you can do yourself (it is heavy, so plan on two people), with no refrigerant work. A new installation means cutting an opening through an exterior wall and fitting a sleeve, which is contractor work and usually needs a building permit. It runs on 230 volts, so it needs a matching 230-volt outlet on its own circuit, and adding one is a job for an electrician.
- Does the Whirlpool 12,000 BTU Through-The-Wall Air Conditioner 230V - With Heat heat as well as cool?
- Yes. It heats with an electric coil, rated 10,600 BTU of heating output on 3,650 watts. At its rated heat it costs about $0.67 an hour at the US average electricity price.
Buying guides for a through-the-wall unit like this
The questions buyers ask, answered from live prices and real specs. See where a through-the-wall unit like this fits.
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