[...] they're often willing to pay more for homes with "green" upgrades, says Sandra Adomatis, a specialist in green valuation with Adomatis Appraisal Service in Punta Gorda, Florida. In 2014, upgraded homes in Los Angeles County saw a 6 percent increase in value, according to a study from Build It Green, a nonprofit based in Oakland, California, that works with home professionals. Consumer Reports suggests that upgrades like a gleaming new kitchen or a finished basement may give you more bang for your buck than energy-saving features. The Environmental Protection Agency's Energy Star program offers assessor and advisory services to help you determine what to upgrade. Keep in mind that a variety of tax credits and financing options are available for energy-efficient improvements. Value report from Remodeling magazine found that the average attic air-seal and fiberglass insulation job costs $1,268, with an added value to the home at resale within a year of completion of $1,482. [...] according to Energy Star, homeowners can save $200 a year in heating and cooling costs by making air sealing and insulation improvements . Replacement costs for an entire HVAC system — heating, ventilation and air conditioning — vary widely depending on equipment brands and sizing, but may run several thousand dollars. Energy Star estimates that you can save 30 percent on cooling costs by replacing your central air conditioning unit if it's more than 12 years old. According to Energy Star, a certified heat pump water heater has a payback time of two years and can save a four-person home $3,400 over its lifetime. While addressing your home's heating and cooling systems, bear in the mind that leaky duct systems can be the biggest wasters of energy in your home, according to Charley Cormany, executive director of Efficiency First California, a nonprofit trade organization that represents energy-efficient contractors. EnergySag