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The most effective natural roach repellent is Borax with its key ingredient of boric acid and diatomaceous earth. But some homeowners may not feel like these are “natural” enough, especially since you can’t use Borax around curious pets or toddlers.

On the other hand, studies have shown that oregano oil mixtures have some of the best repellent effects, and other research indicates that catnip oil, peppermint oil, and citrus oils have notable effects on keeping roaches away. Rosemary oil has been shown to be the most effective natural oil for killing cockroaches outright.

Roaches may not be quite as common on the top floors of a home, but they can easily climb up there if they want to. Second stories are less likely to have food sources and somewhat less likely to have moisture issues, so most roaches are attracted to bottom levels first. However, humid attics and similar spots can help roaches thrive.

Carpenter ants don’t eat wood. It’s a common misconception because many kinds of termites eat wood as well as live inside it. Carpenter ants, however, are omnivores and only chew into wood to create pathways and nests, discarding the chewed wood as frass which is a major indicator of a carpenter ant problem. They prefer to eat smaller insects, sweet things like spilled honey, and sources of protein like pet food.

Yes, it’s possible to have bed bugs and not find them because they hide in small spaces outside of mattresses, including baseboards, headboards, electrical outlets, clothing, and in crevices of walls. They can squeeze into spaces as small as the width of a credit card. Bed bugs can also live up to 400 days without feeding, making them resilient and hard to eradicate.