When placing a wrist within 1/2" in front of the bill airflow on hot air continuously for 30 minutes, the air temperature remained unchanged. When cupping a hand over the bill airflow it took less than 2 seconds for the dryer to trip and turn off. On a scale of 1 to 5 (5 rated Best) this product rates a 5 out of 5 across the board in quality, safety, appearance, ease of use and convenience.