Quick Answer. Clothes dryers typically reach temperatures of at least 120 degrees Fahrenheit, although exact temperatures vary by model and age of the appliance. To kill bedbugs, which are resistant to insecticides, bedding and other fabrics should be placed in a dryer at a minimum temperature of 113 degrees Fahrenheit for 90 minutes. Alternatively, the fabrics may be in the dryer at a temperature of 118 degrees Fahrenheit for 20 minutes.