My compressor bleeds off pressure slowly even when not in use, and has to fire up periodically to get back up to what it is set at. This may be because of the quick release attachments I use on the various hoses. It is noisy when it turns on and runs for a moment or two. And it isn't that far from where I sleep. So I turn it off when I am not using it. Starting from atmospheric psi, it takes a while for it to get up to pressure, and I will have used my floor pump and be around the block long before that happens.