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If it is easy to access open the air handler/fan coil panel and look for the resistance heat strip. It should be quite large on the section towards the supply fan.
It could be a control issue but I would make sure that there is resistance heat there before you start chasing control problems.
It also looks like that you have a 5 ton air handler and a 3 ton condensing unit.
That is quite common in dry areas to oversize the evaporator for the A/C but it doesn't do much for the heat output.
I have an exam to run, will check back later to see how you are doing.
__________________
Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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