I use low heat low speed and just use my heat gun to test how warm. I think they should be in the low 80s in body temp. Maybe someone else can tell you what to do if you dont have a heat gun. I guess I blowdry it for about 3 minutes keeping the hairdrier about a foot and a half away waving the dryer back and forth. The key is not to get it too hot too fast or it will get nasty.