So it's finally starting to get hot around here. Mid 80's today, mid-high 90's expected by the end of the week, so after work this eve I decided to get the little AC unit out and put in the bedroom window. I've had it for 2 or 3 years now, and if I were to guesstimate, I'd say its about 10 year old unit, and it got me wondering, does those things need any service at all. Filters need changing, or refrigerant charged, ever? Or are they simply a "use it til it dies" type item?