The BlueGreen Power Saver saves money with most, but not all, appliances. Thermostatically controlled resistive loads use less power at reduced voltage but operate for longer meaning savings are zero. Such appliances last longer when operated at lower voltage. Switch mode power supplies (SMPS) are common in many electronic products and savings here are low, perhaps 1% to 5% for a 10% reduction in voltage. However these devices are generally relatively small loads such as entertainment systems, phone chargers and IT equipment. The big savings come in refrigeration, motors and pumps. Not only are savings often over 10% but these appliances enjoy significantly longer life. Tests have shown that a typical home will see overall electrical energy reduction of between 6 and 12%.