I use a Neo Hybrid case so it may hide any feeling of high heat but using it full time for last week I haven't experienced any noticeable heat issue. I'll sit in a car, engine off, windows up and watch YouTube while high 80s outside FLA weather at times... waiting in school car line, parking lot at ballet practice, etc., lol. Today spent over an hour/90 minutes using Google Maps and didn't really notice any heat. Phone has been cool running.