The Windmill AC with WhisperTech Inverter Technology is an efficient, quiet, eco-friendly and smart window air conditioner built for today's needs. Award winning WhisperTech Inverter Technology saves up to 40% on energy cost, faster cooling, Quiet Operation (9x quieter than traditional units). With curved edges, clean lines, and a low-profile look, Windmill is designed to blend right into your home. The small-sized 12,000 BTU unit cools spaces up to 550 square feet. And comes with the install kit pre-assembled for a fast and easy setup. | Windmill | | WhisperTech 12,000 BTU Smart Window Air Conditioner with Inverter Technology | White | Best Buy