Adding insulation to your home, particularly in areas like the attic or crawl space, acts as a barrier to heat flow. This means that during winter, insulation helps retain the warmth inside your home, preventing it from escaping to the colder outside. Conversely, in the summer, it helps keep the hot air from infiltrating your living spaces. By maintaining a more consistent temperature, your heating and cooling systems don't have to work as hard, which improves energy efficiency and can lead to lower utility bills.