When it comes to finding the right size portable air conditioner for your room, there are a few factors you need to take into account. The first is the square footage of the room. In general, you will need about 20 BTUs (British Thermal Units) per square foot. So, for a 1000 square foot room, you would need an AC unit with at least 20,000 BTUs.
Another important factor to consider is the layout of the room. If it is a long and narrow room, you will need more BTUs than if it is a short and wide room. This is because AC units cool by circulating air, and in a long and narrow room that circulation can be inhibited.
Finally, you also need to take into account any other heat sources in the room that might affect how much cooling power you need. Things like sun exposure, computers, and lights can all generate heat and make your AC unit work harder.
Taking all of these factors into account will help you choose the right size portable air conditioner for your needs.