Make sure your house is sealed up well. Crawl spaces that are not well sealed, such as attics, and tiny holes in other areas of your home can invite bugs in. Some structures have holes or gaps that you cannot see because they are hidden down low under shelves or in linen closets, so inspect your house to make sure this is not the case. You will not only save money on pest control this way, but you may also save cash on your utility bills since less air will be coming in or leaving through the gaps.
Get rid of any wood piles or collections of old branches and shrubs, as pests can hang out in them. Carpenter ants and even termites may feel right at home in such areas, and can end up entering your residence or causing extreme damage to it from the outside. If you need to keep piles of lumber to build a fire, store them away from the structure to avoid making it easy for insects to enter.