So twice this winter, I have experienced what I would consider a run away situation. Came home today from work, thermostat said 65 degrees. Wife was cooking in the kitchen. Checked the air temp with a kitchen thermometer, read 74.9 degrees. Shut the unit down, power cycled the unit, thermostat showed 74 deg on reboot. No way the temp raise 10 degrees in a min. Any ideas or explanation? Note: it got up to 70 deg outside today.