If set to windshield and feet, not very loud even all the way up. However, push the "Front" button and it's quite loud - which is good for defrosting the windshield. Reminds me of my JLU in that respect...that thing had the heat of the sun blowing at the windshield at eleventy twelve MPH. Need to make some jerky? Throw it on the dash and enjoy a snack in 20 minutesNot to hijack this thread, but does the blower when using heat sound loud, even at medium to low speed?