There are a number of natural methods that can be used to kill bedbugs. These natural methods actually also tend to be the most effective making them the preferred treatment to get rid of bed bugs in your home.
Suffocation – cover all your beddings and furniture using plastic bags and encasements. Ensure that there is no way for them to escape. They will be deprived of oxygen and soon die.
Diatomaceous Earth (Food Grade) - Foor Grade diatomaceous earth is a very effective method for killing and controlling bed bug infestation. It’s important that it is food grade for safety purposes and because it is the most effective. What this substance does is abrade the surface of the bed bugs exoskeleton, and also sticks to them and dehydrates their exoskeleton so they dry out and die. [For More Information: Diatomaceous Earth For Bed Bugs]
Heat - this simply entails heating your clothes, sheets, bed-covers and pillows using your clothes dryer. You can also stuff them in black plastic bags and leave them outside in direct sunlight. It may also involve using a steam vacuum or iron on your beddings. Bed bugs cannot tolerate such intense temperatures and will die. The proper temperature for killing bed bugs is 120°C or above.
Apart from heating fabric or garments in a clothes dryer, you may also use a hairdryer to blow heat into the crevices and cracks on the wall and any wooden surface. This helps to remove and kill most of the bed bugs, leaving the DE to deal with the stubborn survivors.
Cold – Exposing the bed bugs to cold can kill them, but this requires a more sustained effort than heating. While bed bugs will die almost immediately upon reaching the 120 degree temperature for heating, they can hang on a bit longer using cold temps of 4 degrees of below. This method also requires you to live in a fairly cold climate during the cold time of year and to leave the windows open during this time. It is fairly effective, but is not a method most people care to use.
Of the above natural methods, a combination of diatomaceous earth and heat tend to be the most effective. These two methods are cheap, readily available and anyone can try them out; you will not have to seek professional assistance to accomplish them. However, a professional can help you with the heat treatment of your entire home if you find the process to be a bit overwhelming.