8 Best Energy Efficient Air Conditioning Window Units 2025 in the United States

The LG LW1521ERSM1 14,000 BTU window air conditioner is a solid choice for cooling rooms up to 700 square feet, making it suitable for large bedrooms or medium living areas. Its energy efficiency stands at a SEER of 11.2, which is decent though not top-tier for energy-saving models. The unit operates quietly at around 52-53 dB, meaning it won't be overly disruptive during use. One of its standout features is smart connectivity: you can control it remotely through LG ThinQ technology via smartphone or voice commands with Alexa and Google Assistant, adding convenience and modern ease of use.

The air conditioner offers three fan speeds and an auto-cool mode, giving some flexibility to customize comfort. It includes a dust filter and a filter light reminder, helping maintain air quality. Installation fits a typical window size with standard dimensions, and the package comes with an installation kit and remote control. However, the product only carries a 1-year limited warranty, which is relatively short compared to some competitors. While it lacks a programmable thermostat specifically mentioned, the smart controls can likely fill that gap by scheduling.

This LG model combines reliable cooling power with smart features and low noise, making it a convenient, energy-conscious option for users wanting modern control without complexity.

The LG 10000 BTU window air conditioner is designed with several appealing features for those seeking energy efficiency and smart technology in cooling units. The unit's 10000 BTUs make it suitable for cooling medium-sized rooms up to 450 square feet, providing sufficient power for standard residential spaces. One of its standout strengths is the integration of LG ThinQ technology, allowing users to control the air conditioner remotely through Wi-Fi, and compatibility with voice commands via Alexa and Google Assistant. This is particularly convenient for tech-savvy users who desire flexible control over their environment.

In terms of energy efficiency, the unit has a SEER of 11.4, which, while not Energy Star rated, indicates reasonable efficiency for its category. The eco-friendly R32 refrigerant used further supports its sustainability credentials. Noise performance is commendable, operating as low as 52 dB, which should suit users sensitive to noise or those seeking a quieter cooling solution.

Installation appears straightforward with the included kit, and the washable filter simplifies maintenance, contributing to the ease-of-use aspect. The lack of an Energy Star rating might concern those who prioritize maximum efficiency in energy consumption. Additionally, the unit may not be the most lightweight option at 57 pounds, potentially complicating installation for some users. The programmable thermostat and multiple fan speeds offer customization, but the absence of an Energy Star rating might be a drawback for environmentally conscious consumers.

This LG model offers smart technology and quiet operation, making it attractive for users looking for moderate energy efficiency with advanced control features. It might not be the top choice for those with maximum efficiency priorities but serves well for those embracing smart home integrations.

The LG 8,000 BTU Window Air Conditioner is a solid choice for cooling medium-sized rooms up to 350 sq. ft., making it well-suited for bedrooms, living rooms, and apartments. It operates at a low noise level of 53 dB, which is great for maintaining a quiet environment, whether you're working or sleeping.

The unit offers three cooling and fan speeds, giving you control over your comfort. The digital control panel and remote control enhance its ease of use, while the 4-way air deflection allows for flexible cooling direction. The auto-restart feature is convenient during power outages, as it resumes operation automatically once power is restored.

The unit comes with a slide-out, washable filter and includes a filter light reminder to ensure timely maintenance. Installation is straightforward with the provided kit, and its dimensions should fit most standard windows. While its design might not be the most modern, as it was introduced in 2016, this model is a strong contender for those seeking a reliable and relatively quiet window air conditioner with decent cooling power and user-friendly features.