A new report from the Louisville Metropolitan Housing Coalition says heating and other energy costs are playing more of a role in home affordability in the Louisville area.Coalition Executive Director Cathy Hinko says the average natural gas bill has more than tripled over the past decade and continues to rise."All of us are going to feel the pinch this winter, and we wanted to make sure that had a high profile as well. people who did not consider themselves vulnerable as the prices increase will become vulnerable," Hinko said.She adds that many homes in Louisville were built before insulation was a building code requirement, and a lot of them are concentrated in low-income areas.Hinko says the coalition is working with government and utility company officials to help low-income families make the dwellings more energy-efficient.