Stay cool and comfortable with Keystone's 12,000 BTU energy-efficient window air conditioner, the best AC unit for large room air conditioners. This modern and quiet AC unit is designed for easy installation and effectively cools rooms up to 550 square feet, making it the perfect window and wall-mounted air conditioner for your home. With a convenient window AC with a remote control and built-in timer, you can effortlessly manage your desired comfort level while saving on energy costs. This coldest AC unit also offers up to 2.5 pints of dehumidification per hour, ensuring a comfortable and relaxing environment all summer long. Invest in Keystone's window AC unit for reliable and efficient cooling, and say goodbye to discomfort in your living space.