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Some thermostats have sensors and some don't for humidity.Can you provide model on thermostat and if possible, remove front cover on thermostat and tell me what wires connect to what terminals?
Sounds like he may need to speed that blower up if possible.We should only have a 17 to 20 degree drop across the coil. Air moving too slowly will result in a colder than normal coil and actually hurt removal of humidity