subject: Which Home Improvements Add Value to Your Home? [print this page] Older homes often suffer heat loss due to inadequate insulation. By adding insulation and installing energy efficient replacement windows and doors, you can save up to 20% of your annual heating and cooling costs. You can also realize significant savings from newer heating or central air systems. While these improvements will help you save on utility bills, and "new furnace" is a good selling point, the improvement won't add significantly to your home's value.