Most laminators will have a range of temperatures that they can be set at, but the optimal temperature for laminating will vary depending on the type of materials you're using. For example, if you're laminate thicker materials like posters or cardstock, you'll want to use a higher setting to ensure that the adhesive bonds properly. Conversely, thinner materials like photos or paper should be laminated at a lower temperature to prevent them from warping or curling. Generally speaking, most laminators will have a default setting of 3-5, which is suitable for most common laminating projects. If you're unsure what temperature to use, it's always best to start on the lower end and then increase the setting if necessary.