National Grid's EnergyWise programs encourage energy efficiency amongst its residential customers. Interested customers who heat with gas, oil, or propane should schedule a free home energy audit through National Grid’s Weatherization or EnergyWise programs. Once the recommended measures are completed and the installation is inspected, National Grid will provide a rebate of 75% up to $2000. Eligible weatherization measures include: insulation (attic, wall, basement, crawl space, rim joist, or pipe), ductwork leakage testing and sealing, air infiltration testing and sealing.