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You should not spray pesticides of any kind into your air vents. The spray won’t reach far into the vent, minimizing its effectiveness in killing roaches, but more importantly, it’s dangerous for people and pets to inhale these chemicals. Roach spray is not a natural roach repellent, and it’s not safe to spray into air vents.

Certain strong smells may help repel bats, though this is not a foolproof method and is best used in conjunction with other deterrence strategies. Scents like peppermint oil, eucalyptus, cinnamon, cloves, and mint are often suggested as natural remedies. To create a spray, you can mix two cups of warm water with half a cup of sugar and a few drops of your preferred essential oil. Apply this mixture using a spray bottle to possible entry points and throughout the affected area, such as an attic. While this home remedy is popular, evidence supporting its effectiveness is limited.

Cinnamon's warm scent appeals to many people but not to many bugs. The spice contains eugenol, which also happens to be used in insecticides. While the level of eugenol in cinnamon isn't enough to eliminate bugs on its own, the scent can be strong enough to keep them away. 

You can try sprinkling cinnamon around areas where you've seen insects, such as ants and mosquitos. Remember that you'll have to reapply frequently, especially after periods of rain.

Citrus scents such as lemon or lime are lethal to bed bugs. They’re drawn to the smell, but the chemicals often kill them. There are other ways to kill bed bugs without an exterminator, including using steam, DIY heat treatments, essential oils, diatomaceous earth, and more. However, you should hire a professional bed bug exterminator to eliminate large numbers of bed bugs.