Is portable AC worth buying?
Conclusion: Portable AC is not a replacement for window/split AC. Where possible one should go for these conventional Air conditioning units. Portable ACs may work for small rooms and can be considered when there're some challenges to buying/installing conventional AC units.
Why portable ac is bad?
Another hidden problem is inherent with single hose portable air conditioners. They suck air from the room and dump it outside. Besides cooling, a single hose portable A/C creates a vacuum for the room it is in. ... If the air is from other rooms of the house, outside hot air will leak into those rooms.