TCL TCL 15,000 BTU Window AC. Energy Star window air conditioners from TCL are the best way to efficiently beat the heat. Whether you're looking to cool a small bedroom or an expansive living room, TCL has the ideal unit for you. For cooling a room up to 700 square feet, our 15,000 BTU window air conditioner features on-board electronic controls with 3 speeds and a convenient remote control. With our 24-hour on/off timer, cool strong airflow is at your command. Plus, setup is quick and easy with a long power cord and the included window mounting kit.