Ducted A/C system under powered
Fine dust particles can slip through the filter and cake up on the coil which is constantly creating moisture.

Once it is clogged the air flow will be diminished and because of that the air that gets through will be very cold. Eventually it will ice up and burn your fan motor out.

There are specific steps that need to be followed to clean the coil safely and effectively. I’d call a pro out for a service call and tell that human what happened.