I woke up early one morning around 5 AM, and checked the Sense app. I noticed that the electrical usage was high for that time of day.
Sense showed that the attic fan was running.
Once I got into the attic, I realized that the thermostat was mounted incorrectly. As a result, the fan was running for much longer than necessary. The solution was to correctly mount the thermostat so that it would turn off the fan at the set temperature.