It can — and in Montana, the impact is real. A properly installed roof with the right ventilation system regulates attic temperature year-round. In summer it exhausts heat that would otherwise radiate into your living space. In winter it prevents the freeze-thaw cycle that leads to ice dams and heat loss. Both directly affect what you’re paying to heat and cool your home.
The product matters too. Certain shingle lines and metal roofing options are designed with energy efficiency in mind. It’s worth discussing during your estimate if energy performance is a priority for you.