Bren, the A/C filter is very easy to change, just like the air filter. Only problem is its location, which is the right of your gas pedal and behind some carpeting. Not a lot of room in there, but it can be done. No tools required, and you'll definitely need a flashlight for this job.
If you have your owner's manual, the A/C filter install instructions are explicitly stated in there :)
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Thanks Doug, I guess that's an item that is replaced say once a year? And go with a factory filter as opposed to an aftermarket one? B)