Although often overlooked, air conditioning takes a surprising toll on the environment. In the United States, air conditioning units use 6% of all electricity produced and release 117 million metric tons of CO2 into the air each year, the EPA reports. Moreover, air conditioning also accounts for almost half the total energy use in each home and costs homeowners $29 billion annually. Fortunately, there are eco-friendly changes we can make to make our air conditioning systems, so they’re more energy-efficient, kinder to the environment, and stay running smoothly all year round. Use the following tips to keep yourself cool and comfortable without having such a negative impact on the environment or bank balance.