Question on Tune Up Timing

https://griffinrmfy861.lumenforgex.com/posts/what-you-can-fix-yourself-and-when-north-fort-worth-ac-repair-needs-comfort-experts-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