(1) Air conditioning. Once we had two rooms with window AC. Now, we have whole house AC. It was installed Friday while I was gone, and broke down shortly after my return on Saturday. Yes, I realize that I can be bad juju for mechanical stuff, but it wasn't my bad. Installers had wired to ground something that should not have been wired at all, resulting in a smoked transformer on the furnace that Roland found almost immediately. It took a bit longer to find that short. Working now; we'll have the right transformer in a week or so.
(2) Water filter (you may care less about this one). We had rocks coming through from the well, clogging up the washing machine. No more -- whole house filter stops those buggers early on.