It is possible to run a portable AC without an exhaust hose, if necessary. Switch the AC into dry or dehumidifier mode and connect a standard garden hose to the drain port. \
The garden hose will allow you to collect the condensed water that would normally go through the exhaust and go outside. \
However, running the AC without an exhaust means the same warm air is being dumped into the room where the air conditioner is running. This means you really aren't cooling the room at all, just recycling the same air and using a lot of electricity to do it. \