I have no idea of what type of system was installed, but if this is the filter type system, they are fairly easy to service yourself, or with a handyman, I have helped one neighbor 2 or 3 times with changing the filters. Also, typical filters are available at Lowe's. If you can post a picture of your system you might get some better answers.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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