I am up to 3 now and running out of space. I will have to start arranging things better because another humi won't go over well right now. The biggest one is a old end table that I just decided to make into a humi. The seal needs some work, most likely I need to put a latch on it. The door is a bit warped from people opening it by the door for 60 years, not very straight anymore. I sealed the edge with weather stripping and with the exception of the top corner it is tight. Since I fight too much humidity in the summer, I haven't bothered fixing it. I have been able to keep it at 67 for 5 months now, when the heat goes on I will find out if I need to do something.