These simple swaps may keep utility costs down. (iStock) If your bills keep creeping up, a few small changes can help you keep more money in your pockets. Affordable upgrades like smart thermostats and light bulbs can cut utility costs without disrupting your routine, and some start as low as $7. These simple swaps make your home more energy efficient without a big investment. Amazon smart thermostat: $61.99 (23% off) Original price: $79.99 Control your heat and AC more efficiently with a smart