When half a dozen California families arrived in a limo-style bus for a daylong tour of suburban homes for sale north of Dallas, the sun was shining but the temperature had dipped below 50 degrees. Some came unprepared for the cooler weather, shivering in hoodies, flip-flops and one in a Dodgers cap.

“Don’t know how much walking I’ll be doing,” said Paul Paone, 57, a grandfather wearing flip-flops and shorts.