LG 14,000 BTU Dual Inverter Window AC Review: LW1522FVSM
An ENERGY STAR Dual Inverter window air conditioner for rooms up to 700 square feet on a 115V outlet, with sleep mode noise as low as 44 dB, LG ThinQ, Alexa and Google Assistant control.
By Daniel Brooks
Updated October 15, 2026
The LG 14,000 BTU Dual Inverter Window AC is LG’s quiet, efficient answer for large rooms on a standard outlet. Sold as model LW1522FVSM, it is ENERGY STAR certified, runs on 115 volts and is rated for rooms up to 700 square feet. That combination makes it one of the most capable conventional window air conditioners you can plug into an ordinary outlet. It has a 4.0 out of 5 average across more than 65 ratings on its listing.
LG’s DUAL Inverter compressor and BLDC fan motor bring sleep mode noise as low as 44 dB, and LG claims up to 35 percent more energy savings than the ENERGY STAR requirement. LG ThinQ, Alexa and Google Assistant support are built in.
Our Verdict
The LW1522FVSM is a top choice for a living room, large bedroom or open-plan space when you want quiet, efficient cooling and smart control from a major brand. The inverter keeps the room steady, the slide-in and slide-out chassis makes installation easier than most large units, and the slide-out filter is simple to clean.
The trade-offs are weight and price. At 85 pounds it is very heavy for a 115 volt unit, and it costs more than standard 14,000 BTU models. If you have help with installation and value low noise and efficiency, it is well worth the premium.
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Key Specifications
| Feature | Specification |
|---|---|
| Brand | LG |
| Model | LW1522FVSM |
| Type | Dual Inverter smart window air conditioner |
| Cooling Capacity | 14,000 BTU |
| Room Size | Up to 700 sq ft (manufacturer) |
| Noise Level | As low as 44 dB in sleep mode |
| Power | 115 volts, 1260 watts |
| Efficiency (listed) | 14 |
| Certification | ENERGY STAR |
| Speeds | 3 cooling and fan speeds |
| Air Direction | 4-way air deflection |
| Window Fit | 27″ to 39″ wide, 16″ height |
| Dimensions | 22.32″D x 23.62″W x 15″H |
| Weight | 85 pounds |
| Warranty | 1 year parts and labor |
Cooling Capacity and Room Size
LG rates the LW1522FVSM at 14,000 BTU and for rooms up to 700 square feet, which LG describes as large to extra-large rooms. That matches the 14,000 BTU row of the ENERGY STAR sizing guide.
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.
A living room, large bedroom, family room or open kitchen and dining area is the target. The DUAL Inverter compressor ramps up to cool the room quickly, then slows down to hold the temperature steady instead of cycling on and off. In a large space, that steadiness makes a noticeable difference in comfort.
Installation and Fit
The unit has a slide-in and slide-out chassis and installs in double-hung windows from 27 to 39 inches wide with a 16 inch opening height. LG includes its EZ Mount installation kit.
The slide-out chassis is a real advantage at this size. You can install the empty sleeve first, then slide the heavy chassis into place, which is easier and safer than lifting the full unit into the window at once. Even so, at 85 pounds the unit is a two-person job. It measures 23.62 inches wide, 15 inches tall and 22.32 inches deep.
It runs on a standard 115 volt outlet and draws 1260 watts. A dedicated circuit helps prevent tripped breakers.
Noise, Energy Use and Efficiency
LG rates the unit as low as 44 dB in sleep mode, thanks to the BLDC motor and DUAL Inverter compressor. The specifications list 53 dB, which reflects higher fan speeds. Either way, it is much quieter than a standard 14,000 BTU unit and easy to live with in a bedroom or living room.
The unit is ENERGY STAR certified, and LG claims up to 35 percent more energy savings than the ENERGY STAR requirement. The listing shows an efficiency figure of 14, which is excellent for a large window unit. R32 refrigerant is used.
Controls and Smart Features
LG ThinQ lets you control the unit from your phone, including changing the temperature, mode and fan speed while you are away. Google Assistant and Amazon Alexa support let you make changes by voice. On the unit, an LED display and simple control panel handle temperature and fan speed, and a full-featured remote is included.
You get 3 cooling and fan speeds and 4-way air deflection to direct air where you need it. Auto restart brings the unit back on with its previous settings after a power outage. The unit also dehumidifies.
Maintenance and Care
The slide-out washable filter makes cleaning easy, and a Clean Filter Alert reminds you when it is time. LG recommends cleaning it every 30 days to keep the unit running its best.
Because of the weight, many owners leave the sleeve installed and remove only the chassis for winter storage, or cover the exterior if leaving it in place.
Everyday Use
With a unit this quiet, many owners simply leave it running at a steady temperature through the day and night, letting the inverter slow down once the room is cool. The ThinQ app makes it easy to raise the set point while you are out and lower it before you return. In a bedroom, sleep mode keeps noise to a minimum. On muggy days, the dehumidifying function helps the room feel comfortable at a slightly higher temperature, which saves even more energy.
Is It Worth the Premium?
Compared with a standard 14,000 BTU window unit, the LW1522FVSM costs more upfront. In return you get far lower noise, much better efficiency, smart control and an easier installation thanks to the slide-out chassis. For a room where the air conditioner runs many hours a day, those benefits add up quickly.
Pros and Cons
| Pros | Cons |
|---|---|
| As low as 44 dB in sleep mode | Very heavy at 85 pounds |
| ENERGY STAR with strong efficiency | Higher price than standard units |
| Cools up to 700 sq ft on 115 volts | Needs a window at least 27 inches wide |
| LG ThinQ, Alexa and Google Assistant | Draws 1260 watts, best on its own circuit |
| Slide-out chassis eases installation | 1 year warranty |
Who Should Buy It
| Who Should Buy It? | Who Should Look Elsewhere? |
|---|---|
| Living rooms and large bedrooms | Small rooms under about 450 sq ft |
| Light sleepers who need quiet cooling | Narrow windows under 27 inches |
| Smart home users | Budget buyers |
| Buyers focused on running cost | Anyone installing alone |
Final Verdict
The LG 14,000 BTU Dual Inverter Window AC combines large-room cooling on a standard outlet with 44 dB sleep mode, ENERGY STAR efficiency, smart control and an easier slide-out chassis. It is one of the best choices for living rooms and large bedrooms if you can manage the weight and price. You can check the current price and details for the LG 14,000 BTU Dual Inverter Window Air Conditioner.
Frequently Asked Questions
What size room does the LG LW1522FVSM cool?
LG rates it for rooms up to 700 square feet, such as a living room or large bedroom.
How quiet is it?
LG rates it as low as 44 dB in sleep mode. The specifications list 53 dB at higher settings.
Does it work with Alexa?
Yes. It works with LG ThinQ, Amazon Alexa and Google Assistant.
What windows does it fit?
It fits double-hung windows from 27 to 39 inches wide with a 16 inch opening height.
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.