This is from Snake Faqs:
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Mothballs and many other so-called snake repellants don't work. Snakes can be discouraged from staying in an area by cutting off their food supply and cover. Mow closely around homes and outbuildings, and store firewood and lumber away from residences. Reduce mulch layers around shrubs to about 2 to 3 inches in depth to discourage small animals. Snakes also are often found in or near mulch piles and compost piles.
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Also, consider this:
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Snakes sometimes enter buildings looking for food. In spring and fall, young black rat snakes are the most frequent "visitors". Nonlethal control measures are the most commonly practiced forms of control. Close cracks and crevices in building exterior walls and floors and around pipes and utility connections with 1/4-inch mesh hardware cloth, mortar or sheet metal. All doors and windows should have tightly fitting screens. Add weatherstripping around exterior door frames
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Plus, if you have a crawl space under your house, there could possibly be a nest of snakes living there in which case you need to call an exterminator to handle this problem.
Other than the exterminator, cut the grass really short close to the house and put the screen netting around any opening and make sure any and all cracks in the foundation are sealed.