Do not use any pesticide foggers, bombs, sprays, or dusts just prior to treatment. Vacuum or sweep up powders, dust, and pet hair as it can damage equipment (like Diatomaceous Earth).
Eliminate all areas of possible heat loss:
Close and cover A/C vents, bathroom exhaust fans.
Cover single-pane windows (insulated blankets available).
When leaving a room for the final time, place a bath towel under the door to prevent heat escape.
Make sure there is ample space for airflow! Airflow is critical, so any area heavily overstuffed (closets, dresser drawers, stacks of boxes, etc.) will limit the effectiveness of heat treatment and should be rectified. Clothes and other items in piles will serve as insulators.
Disturb the room as little as possible, but organize any excessively cluttered areas. Examples include stacks of boxes, piles of magazines, laundry, and bags of belongings that make it more difficult for heat to circulate, creating possible “cold spots.”
Unless you are permanently throwing something away, it should stay in the treatment area or you could reintroduce the bed bugs back into space. Anything thrown away should be done in tied heavy-duty or doubled up garbage bags before taking it from the room.