There are two main ways of treating bed bugs: pesticides and bed bug heat treatment. Heat treatment is more likely to work in one fell swoop, while pesticides often need multiple treatments. However, either method may require a follow-up treatment. If your exterminator used pesticides, it's unlikely that all the eggs have been killed. More bed bugs are likely to hatch one to several weeks after your treatment.
Hot dryers and portable heat chambers can be used to kill bed bugs in infested household items. Larger heat chambers can be used to treat furniture, while professional heating systems can be used to treat entire rooms and structures. Heat treatment offers certain advantages when it comes to bed bug management.
Steam is another form of heat that kills bed bugs, larvae and eggs. Steam treatment is no more labor intensive than other methods, but it's not meant to penetrate materials deep enough to kill hidden bed bugs. Steaming works on items such as box springs, bed frames, blankets/sheets, curtains and pillows and can be used on several items without
Heat treatment kills the bugs and the eggs DURING the treatment - if there are any bugs left after they are done heating your place, it failed! The sheet they left you is just wrong. I had heat treatment myself and am not a big proponent of them, but there are others on this site that have had success with them.
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How long after bed bug treatment can I return home? In average, the recommended time is around 4 hours. However, there are specific factors to take into account, such as the severity of the infestation, the strength of the chemicals used, the size of the house, air-conditioning, etc. 24 hours should be perfectly fine if it can be arranged.