Small spaces like those mentioned here are ideal for a portable air conditioner. Campers and trailers may have a roof mounted AC, but if not, or if the unit is in disrepair, then it’s a portable AC as the ideal replacement. In times when people want to hang out in the garage like during a party or whatever, the portable air conditioner can provide additional cooled space. When camping, so long there is an electrical outlet, you can camp in a tent with air conditioning. You can just run the exhaust hose out where the tent door zips up, or otherwise do a small modification. For using a portable AC outside in the open like at the poolside, you cannot expect cooling far from the unit, but sitting near the ac can provide a continuous cool breeze to help beat the heat.