Winter does not mean that pests have simply died off until the spring. They are either looking for shelter, or already making themselves comfortable inside your homes. Some
ways to prevent an infestation now is to walk around the outside of the house and check to see if the walls, roof, and landscaping seem to have been tampered with by pests.
Also check the branches in any trees near the house. Branches can act as a nice bridge to your roof for some pests. Clear any branches nearby and keep firewood stocked far away from the house. Pests love woodpiles!