Question on Tune Up Timing

https://raymondwgmj058.stonefielddigest.com/posts/compressor-problems-and-ac-repair-choices-for-north-fort-worth-homeowners-at-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