@carolee888 My sister-in-law lived in Tucson for many years and when we visited her, I made several observations. Traffic is quite bad, so be sure to find your apartment near your hospitals and doctors. Or think about the area a bit south known as Green Valley.

As a Plano resident you are familiar with the summer heat and humidity, winters will be a bit warmer. Get a good air purifier, with the surrounding mountains, there can often be days of "inversion" with bad air pollution.

Good luck with your move.
Sue