Hello! Hot weather will come very soon and the air-cooling will be a necessity. As a rule of thumb, you need 30,000 BTU for 1,500 square feet. So, you need a 2.5 Tons air conditioner for a 1,500 square feet room. It's great that you're thinking about buying an air conditioner now. I found best ac brand in dubai for myself and am very satisfied with his work. I recommend you to visit this site and choose the best option for your home!