I'm a big fan of DIY, I did proactively replace a 5 ton system and a mini-split before I moved to TV six months ago and I did buy all the HVAC tools. I guess I don't understand what your question is?
My system here is only 3 years old here in TV.
So I've clean the outside unit, keep the drain clean, changed the 5" filter, etc and just thought about adding an UV air scrubber.
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