If you rarely use your fireplace, install a tight-fitting cover over the fireplace opening. Drapes Use heavy drapes over your windows and close them at night to keep the heat in. Open drapes and curtains during the day to provide daylighting and warm your home with sunlight. Inexpensive Storm Windows Install inexpensive storm windows made of clear vinyl or plastic. Attach the material to the inside window molding using double-sided tape.
Supplies are readily available in building supply stores.
Some home energy conservation improvements require that you invest some money. It's important to spend money first on measures that will pay for themselves quickly. These important conservation measures are listed in general order of cost-effectiveness. Tune your furnace to peak efficiency. Your furnace uses more energy than any other appliance in your homes, so you want it to operate at maximum efficiency.