This fascinating website Environmental Graffiti offers great ways to help to protect your home from evil spirits.
Some of the easiest are Cinnamon Sticks and Garlic:
A more everyday object such as cinnamon sticks tied over the door will also protect your home. Long ago, this was used by Egyptians to make an area holy, and by the Chinese to purify temples.
And then there is the garlic. This may well be the most common protection hung on doors in many different parts of the world, for protection against a mythical creature known in even the most remote locations on the planet: the vampire. Garlic repels vampires; everybody knows that!
One can never be too careful. Just in case, I like to check The Encyclopedia of Superstitions