Question on Tune Up Timing

https://elliotnnfa083.ironwoodscope.com/posts/electrical-panel-problems-behind-ac-repair-in-north-fort-worth-and-where-comfort-experts-fits-in-2

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