My advice? The mileage bite of a 3326 vs a 3124 will probably not even be noticeable.
No doubt about it, the air conditioner blower is noisy. One of our members (Mike Laupp?) developed a good approach to quieting it down. You can find the thread using the Search tool - it was a couple years ago - or perhaps Mike will chime in and point you to it. But you gotta admit, a noisy airco sure beats no airco, especially if you are in the south.
Maintenance is pretty minimal. Watch the tire pressure like a hawk, grease the bearings (many of us do it once a year, though that is more often than required). If you are expecting freezing weather, drain the pipes. Keep it clean. There really isn't much more than this in the way of scheduled maintainence. Beyond that, deal with loose screws and the like as they come up.
Bill
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