A certain hotel in L.A. has these portable units. Really the only thing portable about it is it has wheels. Yes they do need to vent to the outside or the thing would be a room heater. They have a drip pan for condensation and when it fills up the compressor ie air conditioner stops working. Daily removal unless routed to a drain line. This was an older hotel with low A/C requirements. They would up placing the units on a 14" high box to allow for drainage of condensate through wall via exhaust hose.

If this is to have much use at all, get a model with two hoses. The models with one hose are very inefficient as they suck air out of the room to cool the condenser rather then circulate outdoor air to do that.

I had a single tube and I am glad I got a deal on it because it was good for nothing but sitting in front of. I purchased it thinking I would make a portable garage cooler but all it did was heat it and cool the person sitting in front of it. I used a two hose
that actually cooled the whole garage.