Performed a winter time tune up on an Allied Heat Pump. Found the thermostat bad which is not allowing the outdoor unit to turn on in heat mode. Checked the system in cool mode and found everything is working properly in cool mode only. I will email an estimate for a new thermostat. View visual findings from this job here - https://visionshare.xoi.io/?id=XA-213F-4D93193FA4C5451EB6E234EC464F71D5