I don’t know about that - I had my roof replaced (by insurance thankfully) about a year ago, and it was ~26k. HVAC out of pocket a couple years ago was about 15k. Not fun!
Not at all, these are (roughly) prices for 2-3 bedroom single-family homes. If curious, check AIs for any reasonably successful region around the country like Raleigh, San Jose, Austin, etc. Prices are about the same. I looked up the cost for a dual system for a larger home (that would have 2x AC, 2x furnace) and that jumped to $30k-40k for HVAC. Water heater install (gas, tank) can run $800-3000 depending on the market.
Asking others for prices for windows, I think the spread was somewhere between $50k-90k, although it’s been a while since I asked peeps. That’s before actually going after specialty windows.
Prices have skyrocketed since the pandemic.
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.