thats normal and dont be surpized if it ran longer. a heat pump work by drawing heat from the outside air and if its cold like it was this morning it needs to use your auxulilary (electric resistance) heating to give it a boost. A heat pump does not blow he same hot air out as your furnace up north it, blows a warm air for a longer period of time. At 5 degrees a heat pump is almost useless for it would use all electric resistance to heat your house. Heat pumps work best between 32-45 degrees outside.
When you know your electric resistance heating is working...go look at your electric meter spin...WOW!
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