One of the biggest mistakes people make when they choose solar is failure to pursue efficiency first. Replacing outdated appliances, upgrading heating/cooling systems and switching to LED lighting all reduce your energy bill. In addition to saving you money monthly, using less energy means you can spend less on a smaller solar system. Perhaps most significant in this category, spray foam insulation is usually the smartest investment you can make in your building. Using this material in your attic in addition to a metal roof can reduce your heating/cooling bill by up to 40% while making your home or business more comfortable.