The answer to 'why is my thermostat high energy bills' is that your thermostat may be set to an inefficient temperature or operating schedule. Common causes include an old or malfunctioning thermostat, improper programming, or a thermostat that is not properly calibrated to your home's heating and cooling system.
Some key symptoms to look for include uneven temperatures throughout your home, the HVAC system running constantly, or a thermostat that displays the wrong temperature. Solutions can range from simple DIY adjustments to professional thermostat replacement or HVAC system tune-ups. It's best to start with basic troubleshooting, but if the problem persists, it's recommended to call an HVAC technician to diagnose and resolve the issue.