10 Best Air Conditioners Air Conditioners 2026 in the United States

The LG 18,000 BTU Heat and Cool Window Air Conditioner is designed for medium to large rooms up to 1,000 square feet, making it a solid choice if you need effective cooling and heating in a single unit. With an 18,000 BTU cooling capacity, it can handle fairly large spaces, which is convenient if you want to avoid buying separate devices for different rooms. It also includes a supplemental heating option, so it can keep you comfortable year-round, not just during hot months.

The unit is WiFi-enabled and works with Amazon Alexa and Google Assistant, allowing easy remote control via your phone or voice commands — a handy feature if you like smart home devices. Its energy efficiency ratio (SEER) is 11.1, which is decent but not the highest available, so expect moderate energy consumption. Noise level is around 57 decibels, which is noticeable but typical for a powerful window AC; it won’t be completely silent but shouldn’t be too disruptive either.

Additional conveniences include a filter light reminder, a 24-hour timer for scheduling, and an auto restart function that turns the unit back on after power outages, so you don’t have to reset settings. The unit is relatively large and heavy at 126.5 pounds, which might make installation a bit challenging without help. It also comes with only a 1-year warranty, which is standard but something to keep in mind if you're looking for long-term coverage. This LG window air conditioner is well-suited for users seeking a versatile cooling and heating solution for bigger rooms who appreciate smart controls and can tolerate moderate noise and energy use.

The LG 23,000 BTU Smart Window Air Conditioner is designed for medium to large rooms up to about 1,400 square feet, making it suitable for living rooms or open-plan spaces. Its strong cooling capacity means it can efficiently cool bigger areas, which is a big plus if you want quick and effective comfort. The unit includes a supplemental heating function, which is handy for cooler days, so you get year-round use instead of just summer cooling.

It supports smart control via LG ThinQ, allowing you to adjust settings remotely through your smartphone or voice assistants like Alexa and Google, adding convenience if you like modern tech features. With two fan speeds for both heating and cooling, you can customize how the air circulates to match your comfort needs. The noise level sits at 62 decibels, which is moderately loud—noticeable but not overly disruptive for most daily activities. On energy efficiency, its Seasonal Energy Efficiency Ratio (SEER) is 9.8, which is average for window units; it balances performance and efficiency fairly well. It also has a dehumidifier function, which helps reduce indoor moisture, improving comfort during humid days.

The unit is a bit on the heavier side at 141 pounds, so installation might require some help. If you are looking for a powerful, feature-rich air conditioner that also heats and offers smart connectivity, this model is a strong choice, especially for larger rooms. However, if ultra-quiet operation or top-tier energy savings are your priorities, you might want to consider other options.

The Daikin Oterra Series 18,000 BTU ductless mini-split is a strong choice if you're looking to cool and heat a medium-sized area, around 1,000 square feet. It offers excellent energy efficiency with a high SEER2 rating of 21 and an EER2 of 12.0, which means it will help keep your electricity bills lower compared to many standard units. This model uses the eco-friendly R32 refrigerant and has a heat pump function, making it useful year-round, even in cooler climates down to about 5°F for heating and up to 122°F for cooling.

The unit includes smart features like automatic defrosting to prevent ice buildup and an air purifying filter that can improve indoor air quality. The included installation kit and wall bracket make setup more straightforward, but because it’s a mini-split system, professional installation is generally needed. Daikin units are typically known for quiet operation, which is advantageous for living spaces.

While the upfront cost and installation might be higher than window or portable ACs, this model is best suited for homes or rooms without existing ductwork. For those seeking durable, energy-efficient cooling and heating with advanced features, especially in areas where duct installation is impractical, this Daikin model presents a reliable and effective option.