We typically go to Breck either early June or mid Sept. Most of resorts are below 10,000 ft. Grand lodge has 2 that are at 10,000 feet or above. What thy found was once above 10,000 feet, things warm up in the summer. Grand Lodges on Peak 7 and Grand Colorado on Peak 8 both have AC.
However, in September we don’t find AC is necessary.