Reduce Electricity Bills: sunlight is free, so once you've paid for the initial installation your electricity costs will be greatly reduced. A typical home PV system can produce around 40% of the electricity a household uses in a year.
Energy Audits: 31% of home air leakage are caused by the floors, walls, and ceilings. 15% of home air leakage are caused by the ducts. 14% of home air leakage are cause by fireplaces...