I had a customer that desperately needed automation. The house is in the north east and has a nicely finished basement which has electric heat in the Floor. They also have two huge HVAC units cooling the home. The cool air from the AC fell to the basement and then the basement turned on the floor heat and that heated the entire house requiring more AC (Crazy!!)
The solution was to automate the electric floor and the entire house. I replaced the lights with a combination of Lutron RA2 and Caseta (old switches). I installed Zigbee motions throughout the house including several in the basement. I replaced the heated floor thermostats with Sinope TH1300ZB thermostats.
I programmed the floor to only turn on when someone was in the basement (via the zigbee motions) , the time of year can not be between June 15 - September 15, the AC can not be on cool and the AC can not be cooling. All must be true.
For lighting we had the outside lights programmed for Sunset and Sunrise. I programmed the lighting to turn off and the AC units to move up their thermostat (Ecobee) just by a few degrees when Armed Away (Ring Alarm; third party integration with Hubitat).
After the above changes the first bill with the majority from August (HOT) was $317. Now that is a good reason to automate.