OP, have you checked and changed the air filter? Had Sunshine out during the freeze this last winter when i noticed the aux heat coming on. The tech took some readings and then said he needed to check the air filter, it was clogged, I had forgotten to change it out (every 6 months). i had a new one on hand, changed out and all was fine. The filter was dirty enough to reduce the air flow.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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