Making energy-efficient home improvements can lower utility bills and increase property value. Effective upgrades include insulation, energy-efficient windows/doors, smart thermostats, LED lighting, solar panels, HVAC upgrades, air leak sealing, energy-efficient appliances, water heaters, roofing improvements, landscaping, energy-efficient flooring, plumbing fixtures, home energy management systems, window treatments. Conduct an energy audit, prioritize projects, set budget, research products/contractors, schedule projects, seek professional help as needed, and monitor and maintain systems for continued efficiency.