Clean the filter regularly. Before you buy a major household appliance, work out your exact requirements. Buying an appliance larger than needed will waste electricity. Replace your electric hot water system with a solar hot water system to reduce electricity bills. Use a microwave oven whenever possible when cooking.
Microwaves use less energy than conventional ovens.
Your solar hot water system will work more efficiently if the solar panels are kept clean. Regularly check electrical plugs and cords. If anything is frayed or looks burnt, replace it. When there is no one in a room, make sure the lights and fan are switched off. When buying new appliances check the energy rating.