Question on Tune Up Timing

https://brooksdyqi645.evercolumn.com/posts/outdoor-ac-fan-not-spinning-in-north-fort-worth-is-a-repair-job-for-comfort-experts

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