I think that all salons, even white salons use heat, but the application is quite different.
In AA salons, the heat is directly applied to the hair, e.g. curling irons, flat irons, straightening combs. In some instances, there is nothing to regulate the temperature of the instrument.
In Dominican salons the heat comes from a hard-hat hair dryer and a blowdryer (some people skip the blow dry, altogether) and rarely an electric curler.
Whenever I have requested a rollerset, at least this was the case in Pittsburgh, the stylists would comment that "we don't do rollersets, but we do..." One stylist, who tried to oblige me stated that he had 10-15 rollers /images/graemlins/huh.gif but that was it.
For the salons that DID have the rollers, I was actually talked about like a dog while underneath the dryer. I told the stylist that I would require at least 4 hours under the dryer BEFORE I made the appointment, yet she was still angry that my hair took so long to dry. When she finally pulled me out, my hair was still quite damp, so much so, that when she tried to pull the roller out (the clamps were still in) she ripped my hair.
Another black salon sat me under the dryer w/o rollers to "pre" dry...then they put in velco-rollers and then tried to blow out my roots with a blower that wasn't even hot. I looked TERRIBLE /images/graemlins/angry2.gif PLUS, my hair was ruined.
Sorry for being so long winded...I just wanted to be as descript as possible.