Ok AC guys I need some advice. I have a heater unit installed on top of the coil, Is this correct? I have condensation on the sides and inside of the heating unit with rusting. Also when you remove the ac filter you can tell the difference of how hard the unit is working. And pulling the filter pretty hard. Is this a filter issue? Also told the carbon monoxide chances are great due to incorrect install. I believe it is a Lennox 2 1/2 ton unit.
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