Home appliances, electronics, and even standard light bulbs heat up your house, so turn them on as little as possible. Run the washing machine only when you have a full load, and hang your wash on the line. Also, skip the dishwasher if it’s not at capacity. Instead, wash dishes in the sink and let them air-dry. Steer clear of the oven and stovetop, and opt for the microwave or grill instead. Keep even more heat out of the house by dining alfresco and taking your laptop onto the patio.