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Hello,I am a retired mechanical engineer with 56 years in this business. I will go in depth with you, and up to a 6 hour time limit.
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Is this a central air conditioning system or some other type such as a window unit. If its a central system I need the brand and model number of the outside unit.
We can go from there
If you set most systems for 69F cooling and let it run at night when it is also cool outside, the cooling coil will ice and block most of the air flow... does it seem like the air flow is reduced? Is the outside unit running or not running. Is the largest tube connected to the unit outside frosty or iced?