window air conditioners typically come in various sizes and cooling capacities to accommodate different room sizes. The smallest commonly available window air conditioners have cooling capacities ranging from 5,000 to 6,000 British thermal units (BTUs). These units are suitable for cooling small rooms or areas up to approximately 150 to 250 square feet.
It's worth noting that air conditioner models and sizes can vary over time, and manufacturers may introduce smaller or more efficient units in the market. To get the most accurate and up-to-date information on the smallest window air conditioner available, I recommend checking with local retailers or the websites of air conditioner manufacturers.