10 Best Costco Window Air Conditioners 2026 in the United States

The LG 12,000 BTU Smart Window Air Conditioner is a strong option for cooling medium to large rooms up to 550 square feet, making it suitable for spaces like kitchens or living rooms. With a cooling capacity of 12,000 BTUs, it effectively handles larger areas, which is a big plus if you need powerful cooling. Its noise level is fairly low at 52 decibels on the lowest setting, so it won’t be too disruptive in quieter environments. The unit offers three fan speeds and a 4-way air deflection to customize airflow, plus an auto cool mode for convenience.

One standout feature is the smart control compatibility: it works with LG ThinQ, Amazon Alexa, and Google Assistant. This allows you to adjust settings remotely via your phone or voice commands, which adds flexibility and modern convenience. The auto restart function is useful too—it automatically turns the AC back on after a power outage. On the downside, this model is not Energy Star certified, and its Seasonal Energy Efficiency Ratio (SEER) is 12, which might mean higher electricity use compared to more efficient units. The size is standard for this type of window AC, so you’ll want to ensure your window can accommodate its 22.2” x 23.6” x 15” dimensions. It includes helpful extras like a filter light reminder and a dehumidifier function, which can improve air quality and comfort.

With a solid customer rating of 4.2 out of 5 from over 16,000 reviews, it appears to be a reliable choice for those wanting a smart, powerful window air conditioner. If energy efficiency is a top priority, you might want to compare this with Energy Star-rated models. This unit is well suited for users seeking easy control and strong cooling in larger rooms.

The GE 5000 BTU Electronic Window Air Conditioner is designed for cooling small rooms up to about 150 square feet, making it a good fit for bedrooms, guest rooms, or home offices. Its cooling capacity is suitable if you don’t need to cool a large space. The unit operates at a noise level of 52 dB, which is relatively quiet and should not disturb you much, especially at night. It features three cooling modes and three fan speeds, allowing you some flexibility to adjust the temperature and airflow to your liking.

Installation is simplified with the included EZ Mount kit and fits double-hung windows within the size range of 21.875 to 36 inches wide and 13.375 inches high. The slide-out filter helps keep maintenance easy by making cleaning straightforward, which is important for keeping the AC running efficiently. However, the energy efficiency (SEER of 2.6) is quite low compared to more modern units, and it is not Energy Star certified, so it might use more electricity than newer, more efficient models.

The unit includes a dehumidifier function, which can improve comfort by reducing humidity in the room. On the downside, the cooling power is limited to smaller spaces, so it won’t be effective in larger rooms. Also, while the noise level is low, some might find it noticeable in very quiet environments. This air conditioner is a decent, budget-friendly choice if you need an easy-to-install, no-frills cooling solution for small spaces, but if energy savings and advanced features are important to you, other options may be worth considering.

The Frigidaire 5,000 BTU Window-Mounted Air Conditioner is a compact unit designed for cooling small spaces up to 250 square feet, such as bedrooms or small offices. With a cooling capacity of 5,000 BTUs, it offers consistent and customizable temperature settings. The unit's Effortless Temperature Control feature helps maintain desired comfort levels, while two fan speeds provide flexibility in airflow management.

The air conditioner has moderate energy efficiency with a SEER of 11, though it lacks an Energy Star certification, suggesting it's not the most energy-saving option available. It compensates with user-friendly features like the easy-to-clean washable filter, which aids in maintaining the unit's efficiency over time.

One of its strongest attributes is its quiet operation at 52 dB, making it suitable for noise-sensitive environments like bedrooms. The Auto Restart feature adds convenience by restoring settings after power outages. Installation is straightforward, thanks to adjustable side panels for a snug fit in most windows, and the compact dimensions and extra-long power cord enhance its ease of use. Despite the absence of advanced features like Wi-Fi connectivity or smart controls, it offers substantial value for users prioritizing quiet operation and hassle-free installation in smaller spaces.