The Center on Sustainable Communities has launched an online resource titled "Home Matters" that should help homeowners who want to make energy and resource efficiency improvements to their homes, according to a release. Made possible through funding from the Iowa Energy Center, Home Matters walks homeowners through the process of identifying where the most effective improvements can be made. The guide was developed in three sections based on the era of the home - 1940's and earlier, 1940 to 1975, and 1975 to present.