When selecting a mini-split air conditioner, it is important to consider the size of the room or area you need to cool. A split air conditioner is rated by British thermal units (BTUs), which are related to how much energy your unit will use. The higher the BTUs, the greater the cooling power.
An 11,000-13,000 BTU mini-split AC unit will generally cool a 400-700-square-foot room, while a 15,000 BTU mini split air conditioner can cover a smaller, 800-square-foot room. Keep in mind, of course, that many factors influence cooling, including how well-sealed a room is, how high the ceilings are and what kind of windows and insulation are present.
You can always resort to using window fans or tower fans to keep the air flowing, but you’ll want an AC unit for cool air. A ductless mini-split is perfect in homes where you don’t want to waste energy cooling the whole house down to the same temperature, but it can be a bit pricey. If you want something cheaper that you can easily move between rooms, it might be worth looking into how to choose the best portable air conditioner for your home.