To save money on heating and cooling, you need to protect your home from the elements and make it more efficient. Leaks can be costly and cause high energy bills, but they are also often easy to fix. With a couple of inexpensive items like weatherstripping and caulk, you could save money immediately. Search out leaks around your windows, doors, and ductwork. If you feel an exchange of air, seal that area. That way, your warm (or cool) air stays where it will give you the most comfort and cost savings. After all, you don't want to be heating or cooling the entire neighborhood. Even changing your home's air filter could result in some savings as it places less stress on your heating and cooling system. These items are widely available, and most DIY heating and cooling projects can be completed in a few hours.