In this sentence:
“Baker came back. He had pressed his number 3 onto the right breast of his shirt. “Did he say anything to you?” Garraty asked. “He asked me if it was commencing to come off hot down home,” Baker said shyly. “Yeah, he . . . the Major talked to me.” “Not as hot as it’s gonna commence getting up here,” Olson cracked.
Excerpt from The Long Walk
is "come off hot down home" a whole phrase or are "come off" and "down home" separate expressions?
If the later is the case, would the meaning change if I were to write “He asked me if it was growing hot home?”