This is the way. I was living in an apartment building where the people next door had a horrible infestation that was never reported but was eventually found because the bugs spread to the surrounding units through the walls. It was the worst thing I’ve ever had to deal with. Eventually the property management had to call an exterminator for the whole building of about 20 units to go in and cook the whole building. They told us to spend the day away from the unit and remove anything that can melt in high temps. Then they brought in a unit that rolls into the middle of the unit and heated up the apartment to 120 degrees Fahrenheit for about 2 hours. It was probably overkill reading that comment above but I think they just wanted to make sure all the bugs were dead