Cockroaches can enter your home in many different ways, from the outside through cracks and crevices, vents, sewer and drain pipes. We even bring them in on products like grocery bags, boxes, purses and on our person.Your home is an ideal breeding ground most species of cockroaches. With plenty of food, warmth, water and nesting sites, they can remain active all year round.Cockroaches reproduce quickly. For every one you see there can be many, many more hiding and multiplying behind your walls.if you’ve seen one, you probably haven’t seen them all. The few cockroaches you see by day could mean they were likely forced out by overcrowding; a possible sign of severe infestation.