I have a 2 yr old log home in NC that I use as a second home. It is closed up most of winter. I have been setting my thermostat on 50 all winter. My electric bills are higher than my neighbors who are also snow birds.. I leave refrig. on low and all other power turned off. Does the heat have to be kept at 50 for a log home all winter? I understand that heat pumps don’t work beow 40 degrees and my heat strips are probably what are raising my bills. any alternatives?