Portable air conditioning units are designed to cool a single room and will instantly start cooling it down. They are exceptionally easy to use and simple to setup. All you need to do is put an exhaust hose out a window (to vent away the hot air) and switch it on for instant cold air.
Portable air conditioners are most commonly used in homes, offices, shops and server rooms. They are hugely effective in hot weather and provide a very satisfying cold flow of air. Mobile aircon units all come on wheels and are easy to move around. If you need to carry them up a flight of stairs then you may need two people.