It took three hours Wednesday for Las Vegas firefighters to descend from the roof of the 46-story Vdara Hotel to harness and lower workers one at a time to a landing area below.
NBC affiliate KSNV-TV in Las Vegas aired the rescue live.
The National Weather Service reported 104 degree temperatures and moderate 10 mph winds at nearby McCarran International Airport at the time.
Vdara is one of several hotels in MGM Resorts International’s big CityCenter complex.
A hotel spokeswoman says the workers’ stalled due to a mechanical malfunction.
Clark County spokeswoman Stacey Welling says city and county firefighters were summoned about noon.