22,000 people lost control of temperatures in their homes for hours Tuesday.. DENVER — During the dog days of summer, it's important to keep your home cool. But when thousands of Xcel customers in Colorado tried adjusting their thermostats Tuesday, they learned they had no control over the temperatures in their own homes. ... Xcel confirmed to Contact Denver7 that 22,000 customers who had signed up for the Colorado AC Rewards program were locked out of their smart thermostats for hours on Tuesday. "It's a voluntary program. Let's remember that this is something that customers choose to be a part...