Question on Tune Up Timing

https://remingtonqgmk866.silverstonebrief.com/posts/comfort-experts-explains-strange-ac-noises-and-ac-repair-in-north-fort-worth

Question on Tune Up Timing Does anyone know if spring or fall is better for a tune-up? Not sure when it makes the most sense for an older system in Summerfields, since the AC works hardest in summer but the furnace matters in winter