Was told that they had the thermostat set to 70 and it dropped to 68 at this point the heat strip should start to help back up the heat pump. Most heat pumps are designed 17° outside to maintain 67 inside. Being it was in the single digits this morning. It was below design temperature, which means it wasn’t gonna be able to keep up without the heat strips coming on. 18.5 amps on heat strips. 30° temperature difference on heat strips Heat pump 18° temperature difference. Tested operation of heat pump and stripy could not find any issues today