Energy efficiency investments in buildings are likely to result in the following benefits: reduced energy use for space heating and/or cooling and water heating; reduced electricity use for lighting, office machinery, and domestic-type appliances; lower maintenance requirements; improved comfort; and increased property value. These benefits can be achieved without increasing the size of the building or the cost of construction. Energy efficiency is also important for reducing greenhouse gas emissions from buildings. Energy efficient buildings use less energy for heating and cooling than less-efficient buildings, so they produce fewer carbon dioxide emissions. They may also require less energy to maintain a comfortable temperature inside the building. These advantages can help reduce the impact of buildings on climate change over time. In addition to these environmental benefits, energy-efficient buildings provide financial savings. Less energy used means cheaper bills each month for homeowners and businesses.