For close to two years, more than a dozen home energy assessors, contractors, and workers from three local companies have made the city-sponsored pilot home-efficiency program tick. They’ve made more than 500 Traverse City homes-a remarkable 20 percent of the town’s owner-occupied residences-more comfortable and affordable. The success stories-and the jobs and savings they produce-could multiply dramatically if some Traverse City civic, business, and elected leaders find a way to expand TCSaves into a permanent, communitywide program.