The best way to prevent future infestations of orb weaver spiders is to reduce their food source by eliminating other insects in your yard. You can do this by using insecticides or natural methods such as planting herbs that repel insects (e.g., basil, mint, lavender). Also, keep your lawn trimmed and remove any debris or clutter that may provide shelter for insects. Finally, keep your home tidy by sealing gaps or holes that may allow spiders to enter.