ok will try this todayAs a stop gap fix, keep one of the rooms door slightly open and see if that helps
oh. if it works that way then for me it's very frustrating.
Whenever you are done using the AC, run the blower for 15-30 mins depending on what speed you run at.
The coolant pipe being colder than the surrounding air provides a conducive condition for the growth of moulds and other fungi. This could , at times, lead to foul smell when you start using AC next time.
By blowing the warm air, you remove the coldness in the pipe and hence bring the pipe and the air to the same temps inhibiting growth of fungi.