The Keystone KSTSLV1 is a powerful unit that can cool a room up to 350 square feet. It has 8,000 BTUs, three cooling modes, and a 24-hour timer. It also has a unique design that allows it to fit in both horizontal and vertical sliding windows. <a href="https://coolbreezehq.com/best-ventless-air-conditioner/">official site</a>...
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