Can I claim energy-efficient appliances or energy-saving home improvements?
You can't claim Energy Star appliances or water-saving improvements like low-flow toilets, low-flow shower-heads, or xeriscaping on your federal return. However, many state and local governments and utility companies offer incentives or rebates for energy- or water-saving home improvements. An online search will reveal what your state has to offer (for example, you might search for Arizona toilet rebate, California water saving incentives, etc.).
Under the Residential Energy Efficient Property Credit, you can get a federal tax credit in 2018 for installing alternative energy equipment, such as solar electric property, solar water heaters, geothermal heat pumps, small wind turbines, and fuel cell property.
The federal $500 Nonbusiness Energy Property Tax Credit is currently expired, and we don't know when (or if) Congress will approve this credit for tax year 2018. This credit covered energy-efficient improvements like windows, doors, skylights, insulation, roofing products, nonsolar water heaters, heating, ventilating, and cooling systems. If this credit is approved after your file your 2018 return, you can file an amendment to claim the credit. Another option is to postpone filing your return until Congress definitively approves or denies this credit for tax year 2018.