@atpfm If smart home stuff comes with your home, ensure the previous owner removes it all from their accounts. It can be really hard to transfer ownership afterwards. And don't let them factory reset things like thermostats; that can require some painful set up if they're older devices.

You can test wifi range in a house. Bring a router along, put it where the modem would be, connect your phone to it, and walk around checking your bars. Not a perfect system, but a reasonable indicator.