LG LW1223HRSM 12,200 BTU Window AC Review: ThinQ, Heat, 570 Sq Ft
A 12,200 BTU smart window air conditioner with supplemental heat for rooms up to 570 sq. ft. Includes LG ThinQ app control, a remote, 24-hour timer, 4-way air deflection and Auto Restart. Runs on 230V.
By Daniel Brooks
Updated October 8, 2026
The LG LW1223HRSM 12,200 BTU Smart Window Air Conditioner combines cooling, supplemental heat and LG ThinQ app control in one unit for medium rooms up to 570 square feet. It is one of the few smart conventional window air conditioners that can also warm a room on cooler days.
The specifications list a 230V power supply, so check your outlet before anything else. The other considerations are its 86 pound weight and a fairly tall window requirement. We evaluated it based on the manufacturer’s specifications.
Our Verdict
This LG is a smart, year-round option for a bedroom or living room. Its strongest points are 12,200 BTU of cooling, supplemental heat, ThinQ app control that lets you start, stop or adjust the unit on the go, voice command support, a remote, a 24-hour programmable timer, 4-way air deflection and Auto Restart. The listed noise level is 58 dB.
The trade-offs are the 230V power requirement, 86 pound weight, only 2 fan speeds and no stated heating capacity. If you have the right outlet and want app-controlled cooling plus mild-weather heat for a room up to 570 square feet, it is worth considering.
LG LW1223HRSM 12200 BTU Window Air Conditioner
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Key Specifications
| Feature | Specification |
|---|---|
| Brand | LG |
| Model | LW1223HRSM |
| Type | Smart window air conditioner with supplemental heat |
| Cooling Capacity | 12,200 BTU |
| Heating | Supplemental heat (capacity not listed) |
| Room Size (listed) | Up to 570 sq. ft. (19′ x 30′) |
| Efficiency | 11.6 (listed as SEER) |
| Noise Level | 58 dB |
| Voltage / Power | 230V, 3500W |
| Window Fit | 23″ to 36″ wide, 16″ minimum height |
| Dimensions | 22″D x 23.63″W x 15″H |
| Weight | 86 pounds |
| Fan Speeds | 2 cooling, heating and fan speeds |
| Airflow | 4-way air deflection |
| Smart Controls | LG ThinQ app, voice commands, remote |
| Timer | 24-hour programmable |
| Compressor | Rotary, no inverter |
| Refrigerant | R-32 |
| Warranty | 1 year limited |
Cooling Capacity and Room Size
LG rates the LW1223HRSM at 12,200 BTU for medium rooms up to 570 square feet, about 19′ x 30′, and names bedrooms and living rooms. That covers a large primary bedroom, a living room or an open home office.
The supplemental heat is designed for cooler days. It is a convenient way to take the chill off a room in spring and fall without a separate space heater, but it is not a replacement for central heating in winter.
The 12,200 BTU capacity is slightly above the common 12,000 BTU size. It suits a living room or a large bedroom with a seating area, and the 4-way air deflection helps spread air in rooms that are longer than they are wide.
ENERGY STAR publishes this general guide for sizing a room air conditioner by floor area:
| Room Size (sq ft) | Cooling Capacity (BTU/hr) |
|---|---|
| 100 to 150 | 5,000 |
| 150 to 250 | 6,000 |
| 250 to 300 | 7,000 |
| 300 to 350 | 8,000 |
| 350 to 400 | 9,000 |
| 400 to 450 | 10,000 |
| 450 to 550 | 12,000 |
| 550 to 700 | 14,000 |
| 700 to 1,000 | 18,000 |
Adjust for your room: reduce capacity by 10 percent for a heavily shaded room, increase it by 10 percent for a very sunny room, add 600 BTU for each regular occupant beyond two, and add 4,000 BTU if the unit cools a kitchen. Source: ENERGY STAR.
At its listed 12,200 BTU, it lines up with rooms of about 450 to 550 square feet on the chart, so LG’s 570 square foot claim is slightly above the chart’s range for this capacity.
Installation and Fit
The listed window opening is 23 to 36 inches wide with a minimum height of 16 inches. Window curtain panels, an easy window installation kit, the remote and batteries are included.
The cabinet measures 22 inches deep, 23.63 inches wide and 15 inches tall, and weighs 86 pounds. Plan on two strong people and follow the manual for any support bracket. The specifications list a 230V supply, so the outlet must be a matching receptacle. Never use an adapter or extension cord, and have an electrician confirm the circuit.
Noise, Energy Use and Efficiency
The listed noise level is 58 dB. That is acceptable in a living room and on the lower fan speed in a bedroom, though light sleepers may notice it.
The listing gives an efficiency figure of 11.6, labeled as SEER, and a power draw of 3500 watts, which likely reflects the heater. The compressor has no inverter. App scheduling and the 24-hour timer help you avoid running the unit when nobody is in the room.
Controls and Smart Features
LG ThinQ lets you control the unit from anywhere: start or stop cooling, change the mode or set the temperature while you are out. LG’s description also mentions voice command control.
Electronic controls on the unit and the included remote cover cooling and supplemental heating from across the room. You get 2 cooling, heating and fan speeds, a 24-hour programmable timer and 4-way air deflection. Auto Restart turns the unit back on after a power failure.
App control is particularly useful with a heat and cool unit. You can warm the room before getting up on a cool spring morning or start cooling on a hot afternoon before you get home, without leaving it running all day.
Maintenance and Drainage
The removable, washable filter makes cleaning easy. Because this unit can run for cooling in summer and heating in the shoulder seasons, check and clean the filter regularly throughout the year.
The listing does not describe condensate drainage. Check the manual for how water is handled in cooling and heating modes, and for seasonal storage steps.
Pros and Cons
| Pros | Cons |
|---|---|
| Cooling plus supplemental heat | Requires a 230V outlet |
| LG ThinQ app and voice commands | Heavy at 86 pounds |
| Remote and 24-hour programmable timer | Only 2 fan speeds |
| 4-way air deflection | Heating capacity not listed |
| Auto Restart after power failures | Needs a window at least 16″ high |
Who Should Buy It
| Who Should Buy It? | Who Should Look Elsewhere? |
|---|---|
| Bedrooms and living rooms up to 570 sq. ft. | Homes with only standard outlets |
| Smart home users who want app control | Anyone needing a primary winter heater |
| Buyers wanting cooling and mild-weather heat | Anyone installing alone |
| Homes with a 230V circuit near the window | Windows under 16″ of opening height |
| Buyers who want a remote and timer | Buyers set on an inverter compressor |
Final Verdict
The LG LW1223HRSM 12,200 BTU Smart Window Air Conditioner brings ThinQ app control, voice commands, a remote and supplemental heat to a unit for rooms up to 570 square feet. It suits a bedroom or living room where one unit should handle summer cooling and cooler spring and fall days. The compromises are a 230V power requirement, an 86 pound weight and only 2 fan speeds. You can check the current price and details for the LG LW1223HRSM 12,200 BTU Smart Window Air Conditioner, or compare other window air conditioners with multiple fan speeds.
Frequently Asked Questions
Does the LG LW1223HRSM need a 230V outlet?
The specifications list a 230V supply, so it needs a matching receptacle. Confirm the plug type in the manual and have an electrician check the circuit.
Can I control it from my phone?
Yes. LG ThinQ lets you start or stop cooling, change the mode or set the temperature from anywhere.
Does it heat?
Yes. It provides supplemental heat for cooler days. LG does not list the heating capacity.
What size room is it for?
LG rates it for rooms up to 570 square feet, about 19′ x 30′.
About the author
Daniel Brooks is a home cooling editor at WikiCooling, covering window, portable, through-the-wall and mini-split air conditioners, fans, and dehumidifiers. He researches cooling capacity, energy efficiency, noise levels, installation requirements, and buyer feedback to help homeowners choose the right unit for their room size, climate, and budget.