One of the reasons bed bugs prefer our bedrooms is the temperature. A temperature between 65 to 85 degrees Fahrenheit is ideal for bed bug populations to thrive.  It takes as little as three weeks for nymphs to develop into full-grown and reproducing adults in this condition. There can be up to four or five eggs laid each day by a female bed bug during her lifetime. Bed bugs can be affected by significant changes in the temperature of the environment. Temperature changes can greatly affect their development. Nevertheless, these nasty critters have varying degrees of tolerance to heat and cold. Steam at a temperature of 120 degrees Fahrenheit can kill bed bugs in minutes if it is consistently present. These insects can almost instantly die at 150 degrees Fahrenheit or higher. Bed bugs, however, are more tolerant of colder temperatures, they are naturally able to alter the freezing point of their fluids and adapt.