Since I am limited to buying a machine that fits in a casement window, I must buy this unit. The problems are that you can't easily repair them, only replace. The filters are a joke. They don't seem to filter anything. We'd be better off with a replaceable filter that really does a good job. I've now had to replace this unit(s) a number of times. That means having to buy a contract from the store from which I bought the unit (at a large amount). They say you can't fix the machine, only replace it. Big disadvantage. After awhile I'd like to be able to at least open the unit and vacuum the coils and clean the fan but it can't be done. The units only last a few years and then have to replaced. When it does work, it works well.