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Does anyone here know of a service company or a person that changes A/C filters on units. I have rental property and need someone to perform that service for me on a regular basis. My A/C guy is just too busy to handle it. I'm in the Northeast Tarrant County area (Hurst).

Jay,
I highly recommend the A/C Lady (Euless) for any kind of air conditioning work.
http://aclady.org/

I have no connection with her at all, except for being a customer for the last 3 or 4 years.
If she can't do what you want she probably knows someone who will.