AC system replacement
https://blast-wiki.win/index.php/What_to_Look_for_in_a_Reliable_Heating_and_Cooling_Service
Our old AC unit finally gave out during a heatwave, so we had to get the whole system replaced. The new one is much quieter and seems to cool the house more evenly. The installation crew was professional and cleaned up after themselves. It was a big expense, but hopefully it'll be more reliable for the next decade.