We recently purchased and installed a new high-efficiency heater and installed a LUX TVX1500E thermostat. We would like to know why we set the thermostat for 70-degrees Heat before we tuck ourselves to bed and we awake early in the morning because we are Cold. We find this Thermostat reads 62-degrees and we have to reset it to our desired temperature. What is happening and how can we resolve this? It is getting somewhat Colder and we would like to know if this LUX Thermostat is Ok or defective.