I might have a problem with my heat pump then... The heat isn't enough on normal when it gets to single digits. I noticed this the first time it was this cold, I think last week. I turned it to emergency then it was fine. The temp was dropping in the house just now and I turned to emergency and notced that there's more heat comming out of the vents now and the temp. is going up in the house. It works good in normal if it's not in single digits though. I don't know, I don't know enough about this to know if it's a problem or if this is just how it's setup for this house.