There are times throughout the night that I feel clammy even though the temp is low enough. So basically i'm wondering what the best way to maximize the dehumidifying ability of the ac? The room is small (~125 sq ft) and doesn't get much sun. I bought the smallest possible BTU unit , 5000 BTU, in hopes that the compressor would running often to remove the most humidity possible. Its a model that slings the collected water onto the condenser coils to improve efficacy. I drilled 3 small holes in the plastic bottom to allow the water to drain just incase some of that water was getting back into the room somehow. i used some sheet metal to divert the cold air upwards in hopes that it would leave the compressor on longer. Maybe its the best I'll get but at night when I go to sleep its 72 and in the low 50's % humidity which is nice. But other times I'll wake up and feel clammy and the temp will be the same or lower and the humidity is 65%. I almost feel like 5000 BTU is too much for this small room as the compressor does not stay on for long periods of time. Also this is a cheap unit that the fan runs constantly. When the compressor turns off could the fan be blowing that much humidity back into the air from the evaporating coils? Any idea on how to get the humidity into the mid 40's? I feel so much more comfortable when its around that.

This seems to be my quarter for appliance problems. The unit was making bad sounding noises so I called my HVAC company and the tech said it needed a new expansion valve which he replaced for $1000. Within days the condenser fan began knocking louder and louder, obviously failing. I replaced it and the knock when away. Within a few (5-8) days it has begun making weird noises again. I'm going to give links to recordings of these noises. [B][URL="https://dl.dropboxusercontent.com/u/6246962/AC%201.wav"]Link 1[/URL][/B] is to the startup sounds (the snap you hear at first is the contactor which is normal.) It buzzes in the beginning (it's done this for a long time but continuously--the rest is new). At about twenty seconds in the buzzing will go away and in this quiet period if you listen carefully you can hear the knocking you will hear more distinctly in Link 2. At about 35 seconds it will change to a different kind of buzzing. You will probably have to turn your sound up to here them clearly. [B][URL="https://dl.dropboxusercontent.com/u/6246962/AC%20Knocking.wav"]Link 2[/URL][/B] is to the knocking. Sometimes it's like in Link 1, but other times it's quite loud and I caught one of those times. It makes some other odd/bad sounds but they happen only once in a while and only at startup so it's hard to catch them. I'd have to stand there for a very long time. Oh yes, when it shuts off it makes a loud bang -- not the contactor, much louder. Edited to add: This is a RUDD system