Duke Energy's expanded Home Energy Improvement rebate program offers eligible customers up to $3,850 in rebates for energy-efficient home upgrades after a free Home Energy Check. Rebates include HVAC replacement, energy-efficient windows, attic insulation, duct repair, and heat pump water heaters. The program is available to all residential customers who haven't had a check in two years, including renters. More info is at duke-energy.com.