In order to control and/or eradicate the insects you must first eliminate their food sources, nesting areas (if any), entry points, etc. Sometimes this helps without having to use any insecticides.
If insecticides must be used it is important to choose the least toxic material and use the product in full accordance with the products label. You must know the characteristics of the insects that you are trying to control in order to know where to apply the materials.
If needed (or if appropriate for the type of pest you're experiencing), we can use a "friendlier" product that targets only pests, they have no effect on people, pets or the environment.