Your thermostat can be your best friend or your worst enemy during summer. Use it right, and you will stay cool without burning through your wallet. Use it wrong, and you are just paying to sweat. Here’s how to make your smart thermostat work for you, not against you: Set Your Thermostat to 76–78°F When You Are Home The thermostat is your front line for keeping cool. Setting it to 76–78°F hits the sweet spot for comfort and...