There are many ways to retrofit an older home, but one of the most common is to add insulation. Insulation can help keep your home warm in the winter and cool in the summer, which can save you money on your energy bill. Another common way to retrofit an older home is to add new windows or replace old ones. New windows can help improve your home's energy efficiency, and they also help make your home more attractive. Other ways to retrofit an older home include installing a new roof, adding a new deck or patio, and replacing old appliances with Energy Star appliances.

One common way to retrofit an older home is to add insulation in the attic and walls. You can also add weather stripping around doors and windows, and caulk any cracks or openings where heat might escape. Another option is to upgrade the heating and cooling system, or install a new energy-efficient roof.