LG LW5023 5,000 BTU Window AC Review: Compact, Quiet, Mechanical
A compact 5,000 BTU mechanical window air conditioner for rooms up to 150 sq. ft. with a listed 50 dB low mode, Energy Save function, Auto Restart and an EZ Mount kit for 21 to 35 inch windows.
By Daniel Brooks
Updated October 8, 2026
The LG LW5023 5,000 BTU Window Air Conditioner is a compact, mechanically controlled unit for small rooms up to 150 square feet. LG lists sound levels as low as 50 dB in low mode, which is quiet for a basic dial unit. Among small conventional window air conditioners, it stands out for its compact cabinet and narrow window fit.
It suits small bedrooms, home offices and dorm rooms. The decision is whether simple mechanical controls and a quiet low mode are enough, or whether you want a remote and timer. We evaluated it based on the manufacturer’s specifications.
Our Verdict
This LG is a strong pick for a small room where simplicity and low noise matter. Its strongest points are the listed 50 dB low mode, a compact cabinet, an EZ Mount kit for double-hung windows from 21 inches wide, an Energy Save function, 2-way air deflection, Auto Restart and a slide-out washable filter. It holds 4.2 stars from 518 ratings.
The trade-off is control. There is no remote, no timer and no inverter. If you want a quiet, compact unit for a room up to 150 square feet and are comfortable with dials, it is well worth considering.
LG LW5023 5000 BTU Window Air Conditioner
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Key Specifications
| Feature | Specification |
|---|---|
| Brand | LG |
| Model | LW5023 |
| Type | Window air conditioner, fixed chassis |
| Cooling Capacity | 5,000 BTU |
| Room Size (listed) | Up to 150 sq. ft. |
| Efficiency | 11 (listed as SEER) |
| Noise Level | As low as 50 dB (low mode) |
| Voltage / Power | 115V, 450W, 60 Hz |
| Window Fit | Double-hung, 21″ to 35″ wide, 12″ high |
| Dimensions | 14.37″D x 17.32″W x 11.14″H |
| Weight | 36.4 pounds |
| Controls | Mechanical, adjustable thermostat |
| Cooling Modes / Fan Speeds | 2 / 2, plus Energy Save |
| Airflow | 2-way air deflection |
| Compressor | Reciprocating, no inverter |
| Refrigerant | R-32 |
| Warranty | 1 year parts and labor |
Cooling Capacity and Room Size
LG rates the LW5023 at 5,000 BTU for spaces up to 150 square feet, naming bedrooms, home offices and dormitories. That is a realistic target for a small room with average sun exposure.
At this size there is little spare capacity. A room right at 150 square feet with western sun or several heat sources will push it hard. For a shaded small bedroom or study, it is a good match.
The compact cabinet, at 14.37 inches deep and 11.14 inches tall, also matters in a small room. It leaves more of the window clear and sticks out less on both sides than larger units, which helps in tight dorm rooms or bedrooms with furniture near the window.
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 5,000 BTU, it lines up with rooms of about 100 to 150 square feet, which matches LG’s coverage claim.
Installation and Fit
The fixed chassis fits a double-hung window with an opening from 21 to 35 inches wide and 12 inches high, using the included EZ Mount installation kit. The 21 inch starting width and 12 inch height make it a good option for smaller windows.
The kit includes 2 foam strips, a foam seal, a curtain panel, 3 L brackets, an upper guide and screws. At 36.4 pounds, one person can lift it, but a helper makes it easier to hold steady while you fasten the brackets. Follow the manual so the unit is properly secured.
The curtain panel and foam seals help close the gaps around the unit. Taking time to fit them properly improves cooling and keeps outside noise and insects out.
Noise, Energy Use and Efficiency
LG lists sound levels as low as 50 dB in low mode. That is quiet for a mechanical unit and suits a bedroom, though the higher fan speed will be louder and window sealing affects what you hear.
The listing gives an efficiency figure of 11, labeled as SEER, and a power draw of 450 watts. The Energy Save function is designed to lower electricity use. The compressor is a reciprocating type with no inverter, so it cycles on and off at full output.
In a bedroom, the practical approach is to run the low fan speed with Energy Save at night. Because the compressor cycles, you will hear it start and stop, which is normal for a fixed-speed unit.
Controls and Smart Features
Controls are mechanical: an adjustable thermostat, 2 cooling modes and 2 fan speeds. LG describes them as easy to use, and there are no menus or beeps to deal with.
2-way air deflection lets you direct airflow, and Auto Restart resumes operation with your previous settings after a power outage. There is no remote, no timer and no Wi-Fi. In a small bedroom the unit is usually close enough to reach, but you will need to get up to change settings.
For many buyers, that simplicity is the point. Mechanical controls have fewer parts to fail and are easy for anyone in the household to use.
Maintenance and Drainage
The slide-out washable filter captures particles from the air, and LG recommends cleaning it every 30 days to keep the unit running its best. There are no replacement filters to buy.
The listing does not describe condensate drainage. Check the manual for how water is handled and for steps to remove, clean and store the unit at the end of the season.
Pros and Cons
| Pros | Cons |
|---|---|
| Listed 50 dB in low mode | No remote control or timer |
| Compact cabinet for small windows | No inverter compressor |
| Fits windows from 21″ wide and 12″ high | Only sized for rooms up to 150 sq. ft. |
| Energy Save function and Auto Restart | No Wi-Fi or app control |
| Full EZ Mount kit with brackets and seals |
Who Should Buy It
| Who Should Buy It? | Who Should Look Elsewhere? |
|---|---|
| Small bedrooms, offices and dorms | Rooms larger than 150 sq. ft. |
| Owners of smaller double-hung windows | Anyone who wants a remote or timer |
| Light sleepers who will use low mode | Smart home users who want app control |
| Buyers who prefer simple dials | Buyers set on an inverter compressor |
| Homes with occasional power cuts | Casement or sliding window owners |
Final Verdict
The LG LW5023 5,000 BTU Window Air Conditioner is a compact, quiet and simple unit for a small room. A listed 50 dB low mode, Energy Save, 2-way air deflection, Auto Restart and a complete EZ Mount kit for smaller windows make it easy to recommend for a bedroom or dorm. The compromise is the lack of a remote, a timer and an inverter. If those are not deal-breakers, you can check the current price and details for the LG LW5023 5,000 BTU Window Air Conditioner, or compare other 5,000 BTU window air conditioners.
Frequently Asked Questions
What window size does the LG LW5023 fit?
It fits double-hung windows with an opening from 21 to 35 inches wide and 12 inches high, using the included EZ Mount kit.
Does it have a remote?
No. It uses mechanical controls with an adjustable thermostat, 2 cooling modes and 2 fan speeds.
How quiet is it?
LG lists sound levels as low as 50 dB in low mode. The higher fan speed will be louder.
How often should I clean the filter?
LG recommends cleaning the slide-out washable filter every 30 days to keep the unit running its best.
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.