Hey guys, I was wondering about home AC. Some poeple have told me that ACs are a closed system, and you shouldn't need a freon re-charge. If you do, then you have leak. other have said that you can actually use up the gas particales, making them less effective at cooling. Lately, with this hot weather, my trane XE1000 just doesn't seem to be putting out the coldest air I've felt, and it takes forever to cool off the house in this weather. What have you guys heard about home AC re-charging? Is it needed ever 5 years or something?