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As long as you keep the air speed up on high and the temp setting down some this should be fine. Check the freeze sensors to be sure they aren't bad. If those units are holding the charge fine, it doesn't make any difference how old they are. I have seen some A/C units go more than 30 years! Humid climates are just hard to work with sometimes. Try this and then get back to me if you need more later as all follow ups are included in our fee. I will make the phone option avaiable for you in case you feel that would be more helpful here.
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