This week, Andrea talked about insulating her water heater tank in preparation for cooler weather (of course, that's something you can do any time of year to save money and energy at home). She also listed many other ways to reduce your water heating costs.

Erin blogged about something we don't often think about: the historical perspective of using renewable energy. For example, Leonardo da Vinci had designed a solar powered water heater among other things. As for geothermal energy, archaeological evidence shows that the first human use of geothermal resources in North America occurred more than 10,000 years ago.

Whether you're using renewables or energy efficiency (or both), what are you doing to prepare your home for cooler weather?

Each week, you have the chance to share your thoughts on a question about energy efficiency or renewable energy for consumers. Please comment with your answers, and also feel free to respond to other comments.