Heating and cooling consume about 55% of the energy used in a typical U.S. home. However, you can make a big dent here with a wide variety of technologies that consume energy more efficiently. Supporting equipment, such as thermostats and ducts, provide further opportunities for saving energy. You can conserve even further by installing or replacing home insulation in the attic, etc.
To find out which manufacturers are making the more efficient furnaces and boilers according to size, heating capacity, and fuel source, and how much they cost, refer to either the ENERGY STAR website or the American Council for an Energy-Efficient Economy's website.
American Council for an Energy Efficient Economy
ENERGY STAR
Products in more than 50 categories are eligible for the ENERGY STAR. They use less energy, save money and help protect the environment. Ask for the ENERGY STAR.
Qualified Products
Home Efficiency
Heat and Cool Efficiently

ZEH 2 Integrated Heat Pump Water Heater