Houston is 1 hour ahead of Phoenix (CST), and 2 hours ahead during CDT. Houston uses Central Time and observes DST. Phoenix uses MST (UTC-7) year-round and does not observe DST.
When it's 12:00 PM in Houston, it's 11:00 AM (CST) or 10:00 AM (CDT) in Phoenix.
Most hours work! With only a 1-2 hour difference, business hours overlap significantly.
Houston and Phoenix are both major Southwest US cities. Direct flights connect them in about 2.5 hours.