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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.

The best termite treatment depends on your specific infestation, home, and budget. According to the Environmental Protection Agency (EPA), the most common professional treatments are soil-applied barrier treatments, like liquid termiticides, and termite baits. Bait stations are placed in the soil and work by moving poison back into the colony to kill the queen. For infestations that haven't fully taken root, barriers and targeted termiticides are often the most effective options. Additionally, preventative measures such as moisture removal and installing physical barriers to protect vulnerable wood are important, particularly during construction or remodeling. It is best to work with a termite professional to determine the right treatment for your situation.

Squirrels hate not having access to secure shelter or food sources. Your best line of defense is to make your property less attractive by removing access to these things. There are chemical squirrel repellents, but these have mixed success. According to Pennsylvania State University, you can apply products containing the bittering agent denatonium saccharide to a squirrel's favorite fence, tree, or roof spots. However, you need to reapply repellents regularly, which aren’t scientifically proven effective.

Termites are most active and cause the most damage during the spring and summer, as warm temperatures and increased moisture accelerate their activity. This is also when swarming typically occurs, allowing colonies to expand. However, termites remain active year-round, especially in warmer climates or heated homes. Once a colony is established, it can continue to damage wood 365 days a year, even during cold weather.