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10 Best Casement Window Air Conditioner 2025 in the United States

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Our Top Picks

#1

Winner

LG 12,000 BTU Window Air Conditioner, 115V, Cools 550 Sq.Ft. for Bedroom, Living Room, Apartment, Quiet Operation, Electronic Control with Remote, 3 Cooling & Fan Speeds, Auto Restart, White

Rating
9.9
Chosen by1,387
Noise Level
Installation and Size
Additional Features

Most important from
16444 reviews

Noise Level
This air conditioner has a low noise level, equivalent to the sound of a high whisper or background noise in an average house.
Installation and Size
Although the unit is big and heavy, making shipping and installation challenging, the performance is up to snuff and the price is good.
Additional Features
The energy-saving mode is excellent, allowing the fan to shut off with the cooling compressor and come back periodically to sample air temperature.

The LG 12,000 BTU Window Air Conditioner is a solid choice for cooling medium-sized rooms up to 550 square feet, such as bedrooms, living rooms, or apartments. One of its major strengths is its quiet operation, running at a noise level as low as 52 dB, which is ideal for those who need a peaceful environment for sleeping or working.

Additionally, the unit offers flexibility with 3 cooling and fan speeds along with an Auto Cool feature, allowing you to adjust the air flow according to your preference. The included remote control and digital control panel enhance usability, making it easy to manage the settings from a distance. The unit also features a 24-hour timer, enabling you to set a cooling schedule that can help save on energy costs.

Installation is made simpler with the provided window installation kit, and maintenance is convenient due to the slide-out, washable filter and filter light reminder. However, the device does not have an Energy Star rating, which suggests it may not be the most energy-efficient option available. Additionally, its size and weight could be a consideration for those with limited space or who require frequent repositioning. Despite these points, the LG 12,000 BTU Window Air Conditioner remains a versatile and user-friendly option for those seeking effective cooling and quiet operation for medium-sized rooms.

Rating
9.9
Chosen by1,387
Noise Level
Installation and Size
Additional Features

Most important from
16444 reviews

Noise Level
This air conditioner has a low noise level, equivalent to the sound of a high whisper or background noise in an average house.
Installation and Size
Although the unit is big and heavy, making shipping and installation challenging, the performance is up to snuff and the price is good.
Additional Features
The energy-saving mode is excellent, allowing the fan to shut off with the cooling compressor and come back periodically to sample air temperature.
#2

LG 8,000 BTU Window Air Conditioner, 115V, Cools 340 Sq.Ft. for Bedroom, Living Room, Apartment, Quiet Operation, Electronic Control with Remote, 3 Cooling & Fan Speeds, Auto Restart, White

Rating
9.8
Cooling Capacity (BTUs
Energy Efficiency Ratio (EER)
Noise Level

Most important from
16444 reviews

Cooling Capacity (BTUs
This air conditioner performs very well, with quiet operation and effective cooling.
Energy Efficiency Ratio (EER)
The energy-saving mode is excellent, allowing for quiet intervals while keeping the air fresh.
Noise Level
This air conditioner performs very well, with quiet operation and effective cooling.
Installation and Size
Installation is straightforward, but be prepared for the unit's weight and potential shipping damage.
Additional Features
The inclined cooling grill effectively directs cool air to the ceiling, preventing hot air pockets.

The LG 8,000 BTU Window Air Conditioner is designed to cool rooms up to 350 square feet, making it suitable for medium-sized areas like bedrooms, living rooms, or small apartments. With a noise level as low as 53 dB on its lowest setting, it ensures quiet operation, which is great for undisturbed sleep or focused work. Its energy efficiency ratio (EER) is 13, which is fairly good, although it's not Energy Star certified, meaning it might not be the most efficient model available.

Installation is straightforward with the included kit, and its dimensions (19.6 x 19.4 x 12.4 inches) are compact enough for most windows. The unit includes a digital control panel and a remote for easy operation, along with three cooling and fan speeds and an auto-restart function after power outages. Additional features like the washable filter and filter light reminder add to the unit's usability. However, the product is somewhat heavy at 58 pounds and may require assistance during installation.

This air conditioner is a solid choice for those seeking effective cooling with convenient controls and quiet performance.

Rating
9.8
Cooling Capacity (BTUs
Energy Efficiency Ratio (EER)
Noise Level

Most important from
16444 reviews

Cooling Capacity (BTUs
This air conditioner performs very well, with quiet operation and effective cooling.
Energy Efficiency Ratio (EER)
The energy-saving mode is excellent, allowing for quiet intervals while keeping the air fresh.
Noise Level
This air conditioner performs very well, with quiet operation and effective cooling.
Installation and Size
Installation is straightforward, but be prepared for the unit's weight and potential shipping damage.
Additional Features
The inclined cooling grill effectively directs cool air to the ceiling, preventing hot air pockets.
#3

LG 6,000 BTU Dual Inverter Smart Window Air Conditioner, 115V, Cools 250 Sq. Ft., Ultra Quiet Operation, Up to 35% More Energy Savings, ENERGY STAR®, works with LG ThinQ, Amazon Alexa and Hey Google

Rating
9.6
Cooling Capacity (BTUs)
Energy Efficiency Ratio (EER)
Noise Level

Most important from
954 reviews

Cooling Capacity (BTUs)
The cooling power is impressive, swiftly bringing down temperatures even in hot climates like Texas and Arizona.
Energy Efficiency Ratio (EER)
The energy efficiency is notable, with one user reporting no electric bill above $90 during peak summer months.
Noise Level
Despite its power, the air conditioner operates quietly, making it ideal for spaces where noise is a concern.
Installation and Size
Installation is straightforward, with the cooling unit sliding smoothly into the mounting frame.
Additional Features
The smart features, including the remote and app control, add convenience, especially for those on the go.

The LG 6,000 BTU Dual Inverter Smart Window Air Conditioner is designed to efficiently cool spaces up to 250 square feet, making it suitable for medium-sized rooms. With a cooling capacity of 6,000 BTUs and an impressive Energy Efficiency Ratio (EER) due to its Dual Inverter technology, this unit promises up to 35% more energy savings compared to standard models. This not only contributes to lower energy bills but also ensures it's environmentally friendly with its ENERGY STAR® rating.

A standout feature is its ultra-quiet operation, with noise levels as low as 44 dB in sleep mode, making it an excellent choice for bedrooms or quiet spaces. The inclusion of LG ThinQ technology allows for remote control via smartphone, and it integrates with voice assistants like Amazon Alexa and Google Assistant, enhancing convenience with modern smart home capabilities.

In terms of installation, the unit fits standard windows with dimensions of 24.5 x 19.57 x 12.33 inches, and it weighs 63 pounds, which might require some assistance during setup. The unit also includes multiple fan speeds and modes, providing flexibility in adjusting comfort levels. On the downside, while the unit efficiently cools spaces, it may struggle in larger areas beyond its recommended 250 square feet. Additionally, the weight could be a consideration for those needing to install it in higher windows. The one-year limited warranty offers some peace of mind, although it's a standard duration for most appliances.

For those seeking a smart, quiet, and energy-efficient air conditioning solution for medium rooms, this LG model presents a compelling option with its blend of modern features and performance.

Rating
9.6
Cooling Capacity (BTUs)
Energy Efficiency Ratio (EER)
Noise Level

Most important from
954 reviews

Cooling Capacity (BTUs)
The cooling power is impressive, swiftly bringing down temperatures even in hot climates like Texas and Arizona.
Energy Efficiency Ratio (EER)
The energy efficiency is notable, with one user reporting no electric bill above $90 during peak summer months.
Noise Level
Despite its power, the air conditioner operates quietly, making it ideal for spaces where noise is a concern.
Installation and Size
Installation is straightforward, with the cooling unit sliding smoothly into the mounting frame.
Additional Features
The smart features, including the remote and app control, add convenience, especially for those on the go.

Buying Guide for the Best Casement Window Air Conditioner

Choosing the right casement window air conditioner can make a significant difference in your comfort during hot weather. These units are designed to fit into casement or sliding windows, which makes them different from traditional window air conditioners. When selecting a casement window air conditioner, it's important to consider several key specifications to ensure you get the best fit for your needs. Understanding these specs will help you make an informed decision and ensure that your air conditioner performs efficiently and effectively.
Cooling Capacity (BTUs)Cooling capacity, measured in British Thermal Units (BTUs), indicates how much heat an air conditioner can remove from a room per hour. This spec is crucial because it determines the unit's ability to cool your space effectively. Generally, the higher the BTUs, the larger the area the unit can cool. For small rooms (100-300 sq. ft.), look for units with 5,000-7,000 BTUs. Medium rooms (300-500 sq. ft.) require 8,000-12,000 BTUs, while large rooms (500-800 sq. ft.) need 13,000-18,000 BTUs. Choose a unit with the appropriate BTU rating for your room size to ensure efficient cooling without wasting energy.
Energy Efficiency Ratio (EER)The Energy Efficiency Ratio (EER) measures the air conditioner's efficiency by comparing its cooling capacity to its power consumption. A higher EER indicates a more energy-efficient unit, which can save you money on electricity bills. EER values typically range from 8 to 12. For optimal energy savings, look for units with an EER of 10 or higher. If you plan to use the air conditioner frequently, investing in a higher EER unit can be beneficial in the long run.
Noise LevelNoise level, measured in decibels (dB), indicates how loud the air conditioner will be during operation. This is important for maintaining a comfortable and quiet environment, especially in bedrooms or living areas. Noise levels for air conditioners typically range from 50 to 70 dB. Units with noise levels below 60 dB are considered quiet and are suitable for most living spaces. If you are sensitive to noise or plan to use the unit in a bedroom, opt for a model with a lower noise level.
Installation and SizeThe installation and size of the air conditioner are crucial to ensure it fits properly in your casement window. Measure your window dimensions carefully and compare them with the unit's specifications. Most casement window air conditioners are designed to fit windows with a width of 15-23 inches and a height of 20-40 inches. Ensure the unit you choose is compatible with your window size to avoid installation issues. Additionally, consider the weight of the unit, as heavier models may require additional support.
Additional FeaturesAdditional features can enhance the functionality and convenience of your air conditioner. Look for features such as remote control, programmable timer, sleep mode, and adjustable fan speeds. A remote control allows you to adjust settings from a distance, while a programmable timer lets you set the unit to turn on or off at specific times, saving energy. Sleep mode adjusts the temperature gradually for a comfortable sleeping environment, and adjustable fan speeds provide flexibility in cooling intensity. Choose features that align with your lifestyle and preferences for added comfort and convenience.

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