The first stage of making an older home more energy efficient is to get contractors to make assessments and offer suggestions. An insulation company, for instance, can look at an attic’s insulation and give an estimate on having spray foam insulation blown in. A window company can see if modern, energy-efficient windows might be worth the investment. As appliances get older, they can be replaced with Energy Star rated counterparts. Not everything has to be done at once, either. Improvements can be made as needs arise and the budget allows.