A device and a method to eradicate pests, specifically bed bugs by applying heat. The device includes a bag having an inner surface made of thermoreflective material. Preferably the walls and the bottom of the bag are double layered and at least one heater is inserted in between the double layers. The infested clothing is inserted into the bag and after closing the bag the heater is turned on for a short period of time to increase the temperature to 150-220 F. Once the temperature has been reached the heater is turned off and a minimum temperature of 150 F is maintained in the bag.