I'm not sure if this is relevant to the weather forum, so mods feel free to move it.
So I am thinking about getting either an evaporative cooler or an air conditioner. (Portable of course). Summers here in Seattle are dry, but not excessively so. Do I need to worry about the air becoming too dry with the air conditioner? Or should I get an evaporative cooler, which also makes the air more humid?