We were seeing bills of $700 for Jan/Feb. We purchased a Trane system with the most efficient heat pump and the Cadillac of thermostats the XL950. The first winter we saw savings but nothing like we were expecting. We couldn’t figure out why this much more energy efficient system was still costing as much as it was. This is where Sense came into play. It helped me to identify times of the day when energy was spiking along with realizing our system wasn’t working as I expected.