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Those costs might reflect new build estimates, not regular repair or replacement, which is the point of your OG post. Furnace repair is like $300-500 if you can’t DIY and replacement is $3-7k depending on fuel and region.
Furnace repair is stupid in cost if you can’t do it yourself. Replacement you mentioned is half the cost. Double it for AC. Still $14k. Even $7k is an unpleasant surprise. Mid-range equipment you aren’t replacing in 5 years makes the cost go up as well.
Edit: those numbers are still way low. I’ve seen $10k-12k for just a furnace.